English

Nual Brand
®
Installer’s guide for wire and cables
2
About This Guide
This guide is intended to provide
introductory technical data to
aid in the correct selection of
wire and cable for permanent
installation in commercial,
institutional and industrial
premises. Such installations are
governed by the requirement
of the Canadian Electrical
Code Part I, and enforced by
the appointed authority having
jurisdiction in this area under
provincial law (federal law in the
case of federal territories), with
or without Code amendments as
the case may be.
Wires and cables in installations
falling under the jurisdiction
of the provincial and territorial
inspection authorities are almost
invariably required to be certified
to the requirements of CSA
standards under the approval
of the CSA group.
For more information, contact
your distributor or visit
www.nual.com for the most
current list of product offerings.
Wire and cable products
supplied by General Cable
comply with the codes,
standards and product
specifications as indicated
in this guide.
Weights and measurements
are subject to manufacturing
tolerances and product design
changes. Consequently,
General Cable does not accept
responsibility for costs incurred
by a purchase as a result of
weights and measurements
not conforming exactly to
those indicated.
This guide provides information
on standard products stocked
by General Cable’s distributors.
General Cable also manufactures
a wide range of additional
products in various sizes which
can be supplied by special order.
Contact General Cable toll-free at (800) 661-1451
www.nual.com
3
4
About General Cable
General Cable is a name people
know and trust. For over a
century, our products have
helped supply communities with
power from coast to coast
across the continent. And in that
time we’ve become synonymous
not only with aluminum, but
with the latest technology and
highest standards of quality
and service.
We offer a full range of bare and
insulated wires to both the utility
and distribution markets, and
support them with technical
experts specifically trained to
help our customers achieve their
desired end results.
18001 (Occupational Health &
Safety Management).
We’re committed to the success
of our products, and to the
satisfaction of our customers.
That’s why General Cable will
continue to be a name people
know and trust.
We believe our
customers’
satisfaction relies
entirely on the
quality of our
products.
We believe our customers’
satisfaction relies entirely on the
quality of our products. That’s
why we work hard to ensure
they are consistently superior to
anything else on the market.
Our distribution centre, technical
centre and manufacturing
facilities have attained ISO
certifications 9001-2008 (Quality
Management System) and 14001
(Environmental Management
System) and OHSAS certification
Contact General Cable toll-free at (800) 661-1451
www.nual.com
5
Table of Contents
Engineering Information/NUAL® Brand �� 8
General Armoured Cables �� 10
Fire Test Standards/FT1 and FT4 Rating �� 16
Splicing and Terminating Conductors�� 18
Single- vs Multi-conductor Constructions�� 22
Installation of Single-conductor AC90, ACWU90 & TECK90 Cables�� 26
Recommended Configuration for Parallel
Operation of Single-conductor Cables in Free Air��30-31
Allowable Ampacities
Diagram 1�� 32
Table 5-5 �� 34
Table 5-6 �� 36
Diagram 2 �� 38
Table 5-7 �� 40
Table 5-8�� 42
Diagram 3�� 44
Table 5-9�� 46
Table 5-10�� 48
Diagram 4�� 50
Table 5-11�� 52
Table 5-12�� 54
Notes and Corrections to Tables 5-5 to 5-12�� 56
Application Rules
Section 4: Conductors
Rule 4-004: Ampacity of Wires and Cables �� 60
Rule 4-006: Temperature Limitations �� 64
Rule 4-010: Induced Voltages and Currents in Metal Sheath Armour
or Sheaths of Single-conductor Cables �� 64
6
Section 8: Circuit Loading and Demand Factors
Rule 8-100: Current Calculations�� 65
Rule 8-102: Voltage Drop�� 65
Rule 8-104: Maximum Circuit Loading�� 66
Rule 8-106: Use of Demand Factors�� 67
Section 12: Wiring Methods
Rule 12-012: Underground Installations �� 68
Rule 12-106: Multi- and Single-conductor Cables�� 69
Rule 12-108: Conductors in Parallel�� 70
Rule 12-118: Termination and
Splicing of Aluminum Conductors�� 71
Rules 12-600 – 12-618: Armoured Cable Work Rules�� 72
Rules 12-2200 – 12-2210: Cables in Trays�� 75
Tables
Conductor Ampacities �� 80
Table 5A: Correction Factors�� 84
Tables 5B/5C: Correction Factors�� 86
Table 5D: Current Rating Correction Factors�� 87
Table 8: Percent Conduit and Tubing Fill�� 87
Table 9: Cross-sectional Areas of Conduit and Tubing�� 88
Table 10A: Dimensions of Insulated Conductors�� 90
Table 10B: Dimensions of Photovoltaic Cable�� 94
Table 16: Minimum Size Conductors for Branding�� 98
Table 18: Minimum Size of Grounding Conductor for
Service Raceway and Service Equipment�� 98
Table 21: Supporting of Conductors
in Vertical Runs of Raceways�� 99
Dimensions of Stranded Aluminum Conductors�� 100
DC Resistance Values of Stranded Conductors�� 102
Table D6: Tightening Torques�� 106
Table D7: Tightening Torques �� 109
Basic Metric Conversion Factors �� 112
Notes Pages ��113-119
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www.nual.com
7
Engineering Information
8
NUAL Brand
®
The term NUAL® Brand refers to
General Cable manufactured
aluminum alloy conductor
material, designated as “ACM”
in the CSA Standard C22.2 No.
38. NUAL Brand is produced in
rod form and afterwards drawn
to the appropriate wire diameter
for fabricating building
wire and cable.
NUAL Brand is CSA-certified in
finished building wire form.
Meeting all of the physical and
electrical requirements of
aluminum to CSA standards,
NUAL Brand in addition provides
superior connectability.
NUAL Brand cables are CSAcertified up to 2000 kcmil and are
used in all General Cable
thermoset-insulated conductors
certified to CSA Standard C22.2
No. 38. NUAL Brand conductors
are supplied by General Cable in
sizes 8 AWG and larger, neutralsupported cables which have
AA-1350 phase conductors and
an ACSR neutral/messenger
conductor that is manufactured
in accordance with CSA
Standard C22.2 No. 129.
Contact General Cable toll-free at (800) 661-1451
• Thermosetting wires (RW90
XLPE, RWU90 XLPE) to CSA
Standard C22.2 No. 38
• Photovoltaic conductors
(RPV90, RVPU90) to CSA
Standard C22.2 No. 271
• Nonmetallic sheathed cable
(NMD90) to CSA Standard
C22.2 No. 48
• Armoured cable (AC90,
ACWU90*) to CSA Standard
C22.2 No. 51 and CSA22.2 No. 174
• TECK* cable to CSA Standard C22.2 No. 131 and
CSA22.2 No. 174
• Service cables for underground
installations (USEI, USEB) to
CSA Standard C22.2 No. 52
• Service cables (neutralsupported) for overhead
installations (NS75, NS90) to CSA
Standard C22.2 No. 129
Wiring methods described for
NUAL Brand are equally
applicable to aluminum and
copper conductors.
* With supplementary HL ratings
for all hazardous locations.
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9
General Cable Armoured Cables
AC90
Available Sizes
NUAL® Brand
Single-conductor
Multi-conductor
1/0 AWG to 2000 kcmil
6 AWG to 750 kcmil
General Cable AC90 Single-conductor Cable
NUAL Brand
Phase
Conductor
Concentric NUAL Brand
Bonding Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
10
Interlocked
Aluminum Armour
Specifications
CSA C22.2 No. 51
Suitable for use in cable tray in dry locations
General Cable AC90 Multi-conductor Cable
NUAL Brand
Phase
Conductor
Paper Core Wrap
NUAL Brand
Bonding Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
Contact General Cable toll-free at (800) 661-1451
Interlocked
Aluminum Armour
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11
General Cable Armoured Cables
ACWU90
Available Sizes
NUAL Brand
Single-conductor
Multi-conductor
1/0 AWG to 2000 kcmil
6 AWG to 750 kcmil
General Cable ACWU90 Single-conductor Cable
NUAL Brand
Phase
Conductor
Concentric NUAL
Brand Bonding
Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
12
FT4-rated, AG14
PVC Jacket
Interlocked
Aluminum Armour
Specifications
CSA C22.2 No. 51
FT4-Rated: Vertical Cable Tray Test
CSA C22.2 No. 174 Hazardous Locations
General Cable ACWU90 Multi-conductor Cable
NUAL Brand
Phase
Conductor
Paper Core Wrap
FT4-rated, AG14
PVC Jacket
NUAL Brand
Bonding Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
Contact General Cable toll-free at (800) 661-1451
Interlocked
Aluminum Armour
www.nual.com
13
General Cable Armoured Cables
TECK90
Available Sizes
NUAL Brand
Single-conductor
Multi-conductor
1/0 AWG to 1000 kcmil
6 AWG to 750 kcmil
General Cable TECK90 Single-conductor Cable
NUAL Brand
Phase
Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
14
FT4-rated, AG14
PVC Jacket
Concentric NUAL
Brand Bonding
Conductor
Interlocked
Aluminum Armour
90˚C AG14
PVC inner jacket
Specifications
CSA C22.2 No. 131 (TECK)
CSA C22.2 No. 174 (Hazardous Locations)
FT4-Rated: Vertical Cable Tray Test
General Cable TECK90 Multi-conductor Cable
Nonhygroscopic
filler
NUAL Brand
90˚C AG14
Phase
PVC inner jacket
Conductor
NUAL Brand
Bonding
Conductor
XLPE
Insulation
(Rated -40°C
to 90°C)
Contact General Cable toll-free at (800) 661-1451
FT4-rated, AG14
PVC Jacket
Interlocked
Aluminum Armour
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15
Fire Test Standards
FT1 and FT4 Ratings
The CSA Standard for AC90,
ACWU90 and TECK90 cables
requires that all cables meet
the Vertical Flame Test (FT1
Bunsen burner test) to CSA
Standard C22.2 No. 2556. In
addition, a much tougher level
of performance is specified in
the Vertical Flame Test – Cables
in Cable Tray to CSA Standard
C22.2 No. 2556.
All General Cable ACWU90 and
TECK90 conductors meet both
these levels of flammability
performance. Compliance is
indicated by the designation
“FT4” printed on the outer PVC
jacket and on shipping tags.
PVC-jacketed cables meeting
the FT4 standard are accepted
by the National Building Code
for installation in all parts of
noncombustible buildings,
including vertical shafts and
return air plenums. The 2012
Canadian Electrical Code
Part I reflects an equivalent
performance level requirement,
harmonizing the two major
installation codes.
16
Note: Check with your
provincial building code officials
to ensure compliance with
local amendments.
The unjacketed construction,
type AC90, is not required to
meet the FT4 test, but is fully
compliant. Its interlocked
aluminum armour is considered
equivalent to insulated
conductors in metal conduit
and is highly resistant to
flame spread.
Appendix “B”, Rule 2-126 of the
CEC explains the application of
cables bearing the FT1 and
FT4 designations.
FT1 – Wires and cables that
are suitable for installation
in buildings of combustible
construction
FT4 – Wires and cables that are
suitable for installation in:
(a) buildings of noncombustible
and combustible construction;
and (b) spaces between a ceiling
and floor, or ceiling and roof,
that may be used as a plenum
in buildings of combustible or
noncombustible construction.
Wires and cables with
combustible insulation, outer
jackets or sheaths that do not
meet the above classifications
should be located in enclosed
noncombustible raceways,
masonry walls or concrete slabs.
Wire and cable passing these
tests will be marked FT1 or FT4
directly on their jackets. They
will be suitable for installation in
buildings as shown above.
Rule 2-126 and Appendix B and G
of the Canadian Electrical Code
Part I, Twenty-second Edition,
2012, provides cross-reference
to the National Building Code
of Canada.
Contact General Cable toll-free at (800) 661-1451
NOTICE
Purchasers, installers and
end-users of cables with
nonmetallic coverings should
note the following:
WARNING
FLAMMABLE: Nonmetallic
coverings of electric cable will
burn and may transmit fire
when ignited.
TOXIC: Burning nonmetallic
coverings may emit acid gases
which are highly toxic, and
dense smoke.
CORROSIVE: Emission of acid gases
may corrode metal in the vicinity,
such as sensitive instruments
and reinforcing rods in concrete.
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17
Splicing and Terminating Conductors
General
When splicing and terminating
either an aluminum or copper
conductor, care should be taken
to ensure service continuity.
General Cable recommends
the following procedures for all
cable connections:
1. Fittings
Use only terminal lugs and
connectors certified and marked
“AL9CU” and “AL7CU” which
are suitable for both aluminum
and copper. If the equipment is
not approved for aluminum, an
approved adapter may be used.
2. Insulation
Remove insulation from the
conductor in a manner that
avoids nicking, ringing or
otherwise damaging
the conductor.
3. Cleaning
Wire brush the exposed
conductor end to remove any
oxide film. Coat with a suitable
joint compound to inhibit its
reformation, thus protecting
the contact surfaces from air
and moisture.
18
4. Installation
Insert the prepared cable end
into the connector or terminal
lug and secure the connection.
Ensure that the correct tool, die
and compression sequence are
used for compression fittings
and that appropriate torque is
applied to all threaded hardware
including bolted and mechanical
set screw type connectors.
5. Binding Head Screws
When connecting solid
conductor with a binding head
screw, make a 3/4 loop under
the screw head and secure.
Outdoor Armoured
Cable Terminations
For outdoor terminations on
General Cable's ACWU90
and TECK90 cables such as
connections to overhead lines
or outdoor bus, or where it
is permitted to discontinue
the bonding conductor, we
recommend the method
shown on page 20.
Contact General Cable toll-free at (800) 661-1451
Typical examples are 1) in
service entrances, in both
single- and multi-conductor
constructions, where the neutral
conductor also serves as the
ground path, and 2) in singleconductor feeders rated over 425
amps, where the bonding circuit
is discontinuous in order to avoid
sheath circulating currents. Care
must be taken to seal the cable
ends properly and to solidly
bond the armour and bonding
conductor wires at the other end
of the cable using an AL9CU or
AL7CU-rated connector bolted
to the equipment enclosure.
Care should be
taken to ensure
service continuity.
Note: Lugs and connectors
for NUAL Brand conductors
are typically certified to
CSA 22.2 No. 65.
www.nual.com
19
Splicing and Terminating Conductors
Single-conductor Cables
1. Strip back armour and
PVC jacket.
2. Fold the bonding conductor
strands back over the armour.
3. Waterproof the whole
termination by using CSAapproved wet-rated heat
shrink tubing.
1
Multi-conductor Cables
1. Follow step 1 above.
2. Cut off the bonding conductor
flush with the armour.
3. Follow step 3 above.
2
Note: Care must be taken to seal
the exposed conductor by taping
it with a self-sealing rubber tape
or heat shrink tubing. The goal
is to prevent water getting
inside the insulation and
the cable assembly.
3
20
Services Above
& Below Ground
General Cable type ACWU90 and
TECK90 cable may be used for
services both in the single-and
multi-conductor form. Singleconductor services should have
all the bonding conductor wires
attached to a common lug bolted
to the service equipment using
a AL9CU connector.
Contact General Cable toll-free at (800) 661-1451
Parallel Circuits
For very large loads it is
sometimes economical to
parallel two or more cables.
When this is done, we strongly
recommend that the lengths, size
and construction of the cables
and connectors be identical.
Refer to Code Rule 12-108 for
CEC requirements for parallel
conductors. In order to obtain
reasonably good load-sharing
among the single-conductor
cables, it is important that
the impedance of each cable
be almost identical to that of
the other cables of the same
phase, and for this reason we
recommend the configurations
shown on pages 30-31.
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21
Single vs. Multi-Conductor Constructions
General
It is well known and understood
that installations of armoured
cable are more economical than
pipe and wire installations. This
is due largely to the fact that the
activities of conduit installation
and wire pulling are not required
with armoured cable. Armoured
cables are readily available
in single-and multi-conductor
constructions. There are various
aspects that should be taken into
consideration when choosing
between these two. The
attractions of first-cost savings
of single-conductor cable may
need to be tempered with other
technical considerations. The
first-cost savings may be much
less than they first appear, and
the integrity of the circuit is
subject to some potential pitfalls.
• The cost savings from
smaller conductors, sized in
accordance with Tables 1 and
3 of the code, are diminished
by increased armour, bonding
conductor, or metal sheath,
extra jacket cost, and the
addition of an external bonding
conductor in large singleconductor cables.
22
• The 70% derating for singleconductors may call for a
higher equipment and cable
cost than expected, when
compared with the 80%
derating for multi-conductor
cables. (Code Rule 8-104).
• When comparing singleconductor to multi-conductor
cables, fully account for the
end-user energy conservation
needs, and ensure that all code
rules, equipment limitations
and health concerns have
been fully addressed.
Some of these technical
concerns are outlined below.
If assistance is needed, do not
hesitate to contact your nearest
General Cable sales office.
Cost of Material
Recent analyses demonstrate
that multi-conductor armoured
cables can be more costeffective than single-conductor
constructions for many
installations. While singleconductors can often save firstcosts, due to higher ampacity
ratings, this advantage is
partially offset by the extra cost
Contact General Cable toll-free at (800) 661-1451
of additional armour or sheath on
singles as compared to only one
on multi-conductor cable.
Cost of Labour
Labour is often higher in
single-conductor installations.
Each phase being an individual
cable requires all the same
handling procedures as multiconductor cables which contain
all of the phases.
Voltage Drop
A further effect of singleconductors in longer feeder
circuits can be increased voltage
drop. This arises not only on
account of the higher resistance
of the smaller conductors, but
also on account of the increased
spacing between conductors in
single-conductor systems.
It is a fact that greater spacing
increases impedance and
inductive reactance, which
is the main contribution to
voltage drop. The tables
presented in the Code
appendices are nominal
ampacities which in no way
account for voltage drop.
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23
Single- vs. Multi-Conductor Constructions
General Cable provides upon
request a program which can
be used for precise calculation
of voltage drop.
Magnetic Fields and
Harmonics
The magnetic fields surrounding
single-conductors can extend
much farther than those
surrounding multi-conductor
cables. The nuisance effects of
the magnetic fields can be both
elusive and expensive to correct.
Typical nuisance effects involve
the actions of the magnetic
fields on sensitive electronic
equipment, such as computers.
In extreme cases, shielding and
filtering of power supplies may
be the only way to remedy
the situation.
The magnetic field from each
conductor is cancelled by those
of the neighbouring conductors
in a three-phase system with a
pure sine wave form. In a fourconductor cable, the magnetic
fields neutralize almost totally
within the cable. However, the
fields of single-conductors
can extend much farther,
24
depending on the spacing
between the conductors.
Magnetic fields are amplified
in circuits with high levels of
third harmonic currents and
multiples of the third harmonic.
These currents are common
today due to electronic devices
which chop the wave form of the
voltage. One of the unexpected
results is that third harmonic
magnetic fields in each of the
three phases are additive, so
the magnetic field surrounding
a group of three conductors can
be much greater than would
be expected. This amplified
magnetic field is cancelled only
by the field from the neutral
conductor. In large singleconductor feeders, the neutral
conductor is often located a
significant distance from some
of the phase conductors, leading
to propagation of third harmonic
magnetic fields to greater
distances. The use of multiconductor cables will eliminate
this concern, owing to their
close proximity.
Special precautions are
necessary with single-
conductor systems, in addition
to those previously mentioned.
Accessories which totally
surround single-conductor
cables, such as clamps and
connectors, must be non-ferrous
to avoid magnetic hysteresis
and eddy current losses,
which could lead to serious
overheating. Third harmonic
currents will greatly increase
the magnetic losses in such
components. The current sharing
between parallel conductors
of the same phase must be
ensured by attention to phase
configurations. Sometimes
imbalances in the current
sharing can be present due to
inherent difficulties in complying
with spacing requirements. It is
virtually impossible to balance
the third harmonic currents
equally with any type of
single-conductor phase
configuration, although this
is automatically achieved
with four-conductor cables.
cables, including their causes
and effects, is provided in
the Appendix B notes to Rule
4-010 of the 2012 Canadian
Electrical Code Part I. They can
be prevented by rigid attention
to methods explained in the
following pages.
Circulating Currents
An explanation of circulating
currents in metallic sheaths
and armour of single-conductor
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25
Installation of Single-Conductor Cables: AC90, ACWU90
Circuits Rated Up to
425 Amps Inclusive
On any AC system, currents
flowing in the center conductor
will induce small currents in the
concentrically applied bonding
wires and in the interlocked
armour. For circuit ampacities
up to and including 425 amps
these induced currents do
not affect the cable ampacity
and may be neglected. We
recommend terminating the
cables as follows: the bonding
wires of all cables entering the
equipment enclosure should be
bunched and connected to the
bonding screw of the terminal;
(2) the armour of each cable
should be attached to the entry
plate by means of an approved
connector, and the entry plate
should be aluminum or some
other nonmagnetic
conducting material (1).
26
0 & TECK90
Circuits Rated Over 425 Amps Inclusive
1
Aluminum Plate
Aluminum Plate
2
1
2
Note: In the 2012 Canadian Electrical Code Part 1, Rule 4-010 has added direction
regarding single-conductor cables carrying more than 200 amps. See the full text under
"Application Rules" in this handbook.
Contact General Cable toll-free at (800) 661-1451
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27
Installation of Single-Conductor Cables: AC90, ACWU90
Circuits Rated
Over 425 Amps
For single-conductor cables
rated over 425 amps, the induced
current in the concentric
bonding conductor is potentially
large and precautions must
be taken to interrupt it. It is
recommended that the cable at
one end, preferably the supply
end, enter the panel by means of
an aluminum plate thick enough
to properly support cables and
withstand any bending moments
(3) and that the bonding wires
from each cable be connected
together in a common lug and
bonded to the metallic enclosure
or grounding bus of the
equipment (4). At the other end,
the cables should enter the panel
through a non-conducting plate
at least 6mm thick (5) and the
bonding wires cut off as in (6).
It may be necessary to run
an external bonding conductor
to bond the equipment at each
end to comply with code rules.
Note 1:
Single-conductor type AC90
cables, in circuits rated
28
over 425 amps and sized
according to Table 3, C.E.
Code Part I, ampacities are
not recommended due to the
excessive risk of overheating
caused by circulating armour
and bonding conductor currents.
A PVC jacket (as in ACWU90 or
TECK90) is the only practical,
effective means of armour
isolation from grounded
metal parts.
Note 2:
To avoid the heating effect
caused by eddy currents,
make certain that individual
single-conductor cables are
not surrounded by magnetic
material. Avoid the use of steel
or iron cable connectors or steel
clips onto steel supports.
Note 3:
When conductor lengths are
selected to meet the CEC's
maximum 3% voltage drop
requirement, standing voltages
on concentric bonding wires
for 600 volt systems will remain
below 25 volts during normal
operating conditions.
0 & TECK90
Circuits Rated Over 425 Amps
3
Aluminum Plate
5
Fibre Plate Non-conducting
6
4
Note: In the 2012 Canadian Electrical Code Part 1, Rule 4-010 has added direction
regarding single-conductor cables carrying more than 200 amps. See the full text under
"Application Rules" in this handbook.
Contact General Cable toll-free at (800) 661-1451
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29
Recommended Configuration for Parallel Operation of
X = One cable diameter (above ground).
A,B,C= Phase conductor designation.
N = Neutral conductor designation.
Single Phase
Two Conductors
per Phase
N
x
A
x
B
x
B
x
A
x
N
OR
A
x
B
x
N
x
B
x
N
x
x
A
Three Conductors
per Phase*
A
x
B
x
N
A
3x
x
Four conductors
per Phase
B
N
x
x
B
x
B
x
A
x
N
A
3x
x
x
N
x
N
x
A
x
B
x
A
N
B
x
N*
x
x
B
x
A
OR
A
x
B
x
B
x
A
x
N
x
N
x
B
x
B
x
A
x
N
x
N
x
A
x
* Precise load sharing is difficult
with three conductors per phase and the
configurations shown represent the most
practical compromise.
Note:
(1) N
eutral conductors may be located
outside the above groups in the most
convenient manner or as shown.
General Cable strongly recommends the
use of one-, two-or four-conductors per
phase due to the ease of achieving equal
current sharing in practical installations.
(2) N
ot all the configurations shown provide
precisely equal load sharing. The
imbalance is decreased as the
separation of the groups is increased
relative to the spacing of conductors
within the group.
30
f Single-Conductor Cables in Free Air
D=S
eparation of groups equal to width
of one group.
X = One cable diameter (above ground).
A,B,C = Phase conductor designation.
N = Neutral conductor designation.
Three Phase
Two Conductors
per Phase
A
B
x
C
x
C
x
x
B
x
A
N
x
N
x
OR
A
x
B
x
C
x
N
x
B
x
A
x
N
x
x
C
OR
A
x
N
Three Conductors
per Phase*
A
B
x
B
x
C
x
x
A
3x
x
B
A
x
D
C
x
C
x
C
C
x
x
B
x
A
3x
N
x
B
x
C*
x
OR
A
x
B
C
x
N
x
A
x
x
B
x
N
A
x
x
B
x
C
x
N*
OR
A
x
B
Four Conductors
per Phase
x
B
A
x
x
C
x
A
x
D
x
D
C
x
C
A
B
x
x
D
C
x
D
B
x
x
x
A
B
B
x
x
D
C
x
A
x
C
x
C
A
x
x
B
OR
A
x
B
x
C
x
C
x
B
x
A
x
N
x
N
x
B
x
C
x
C
x
B
x
A
x
N
x
N
A
x
B
C
x
x
A
x
OR
x
x
C
B
x
x
B
C
x
A
Contact General Cable toll-free at (800) 661-1451
A
x
x
x
C
x
B
x
www.nual.com
A
31
Applicable Installation Configurations for Single-Cond
Diagram 1
DETAIL 1: 1 cable per phase
DETAIL 2: 2 cables p
915
190
190
190
190
1
DETAIL 4: 4 cables p
ble per phase
DETAIL 2: 2 cables per phase
DETAIL 3: 2 cables per p
915
915
190
190
190
190
190
190
1
DETAIL 6: 6 cables p
190
190
DETAIL 4: 4 cables per phase
190
61
DETAIL 5: 4 cables per p
915
phase
DETAIL 3: 2 cables per phase
190
915
le per phase
190
915
190
190
190
190
190
DETAIL 2: 2 cables per phase
915
phase
190
190
61
DETAIL 3: 2 cables per p
190
190
DETAIL
6:1906 cables 610
per phase190
190
190
1
DETAIL 7: 6 cables per p
190
915
DETAIL 5: 4 cables per phase
915
190
915
190
190
190
190
915
190
DETAIL 4: 4 cables per phase
190
190
190
610
DETAIL 5: 4 cables per p
190
190
915
190
190
190
190
190
phase
610
190
190
190
190
190
190
190
190
190
DETAIL 7: 6 cables per phase
190
915
190
190
915
DETAIL 6: 6 cables per phase
190
915
190
Note: All
dimensions in mm.
190
190
190
32
190
190
610
190
61
190
190
61
DETAIL 7: 6 cables per p
190
190
190
190
190
190
ductors Directly Buried in the Earth
phase
DETAIL 3: 2 cables per phase
915
e per phase
190
915
DETAIL 2: 2 cables per phase
190
190
915
phase
190
610
DETAIL 3: 2 cables per p
190
190
DETAIL 5: 4 cables per phase
915
190
190
190
190
915
190
915
190
DETAIL 4: 4 cables per phase
190
190
190
610
DETAIL 5: 4 cables per p
915
190
190
190
phase
190
610
190
190
DETAIL 7: 6 cables per phase
915
phase
190
190
190
190
190
190
915
190
DETAIL 3: 2 cables per phase
DETAIL 6: 6 cables per phase
190
915
190
phase
190
915
190
190
190
610
DETAIL 7: 6 cables per p
915
190
190
190
190
190
610
190
190
610
190
190
DETAIL 5: 4 cables per phase
190
190
190
190
915
915
190
190
190
190
190
190
190
190
190
190
phase
190
190
190
190
610
190
190
DETAIL 7: 6 cables per phase
190
915
915
190
190
190
190
190
190
Contact General Cable toll-free at (800) 661-1451
610
190
190
www.nual.com
33
610
Table 5-5
Allowable Ampacities for Single-Conductor
Cable Directly Buried in the Earth –
Non-Continuous Loads (See Diagram 1)
1/Phase
Detail 1
Size, AWG
or kcmil
2/Phase
Detail 2
2/Phase
Detail 3
9A
8A
9A
8A
9A
8A
1/0
190
245
190
245
190
245
2/0
220
285
220
285
220
285
3/0
255
330
255
330
255
330
4/0
300
385
300
385
300
385
250
330
425
328
421
330
425
350
415
530
390
500
410
520
500
515
660
471
605
495
630
600
585
740
513
659
541
682
750
665
845
580
745
610
775
1000
780
980
659
846
710
890
1250
868
1083
750
935
790
985
1500
952
1176
821
1011
865
1068
1750
1027
1257
880
1078
932
1140
2000
1094
1325
934
1133
991
1200
The ampacities of this table are those contained in Tables D8A and D9A
of the Canadian Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth
temperature, configurations of Diagram 1, and the following conditions:
(a) For any load, the cable terminates at equipment of any type other than
a fusible switch or circuit breaker; or
(b) The load is NON-CONTINUOUS and either end of the cable terminates
at a fusible switch or circuit breaker.
34
4/Phase
Detail 4
4/Phase
Detail 5
6/Phase
Detail 6
6/Phase
Detail 7
9A
8A
9A
8A
9A
8A
9A
8A
158
203
171
220
129
165
140
179
178
229
193
248
145
186
157
202
201
258
218
280
163
210
178
228
227
291
246
315
183
236
200
256
247
317
267
343
200
256
217
278
292
375
318
408
237
304
258
331
352
452
383
489
284
365
309
396
382
491
419
534
308
397
340
433
431
554
469
596
348
447
379
482
488
627
542
683
393
505
437
551
554
691
604
753
446
556
487
607
605
746
660
813
487
600
531
655
647
793
706
865
520
637
568
696
686
832
749
909
552
669
602
730
Contact General Cable toll-free at (800) 661-1451
www.nual.com
35
Table 5-6
Allowable Ampacities for Single-Conductor
Cable Directly Buried in the Earth –
Continuous Loads (See Diagram 1)
1/Phase
Detail 1
Size,
AWG
or
kcmil
9B
2/Phase
Detail 2
8B
9B
2/Phase
Detail 3
8B
9B
8B
100%
80%
100%
80%
100%
80%
100%
80%
100%
80%
100%
80%
1/0
162
133
208
172
162
133
208
172
162
133
208
172
2/0
187
154
242
200
187
154
242
200
187
154
242
200
3/0
217
179
280
231
217
179
280
231
217
179
280
231
4/0
255
210
327
270
255
210
327
270
255
210
327
270
250
281
231
361
298
281
231
361
298
281
231
361
298
350
353
291
450
371
353
291
450
371
353
291
450
371
500
438
361
561
462
438
361
561
462
438
361
561
462
600
498
410
629
518
498
410
629
518
498
410
629
518
750
570
469
718
592
570
469
718
592
570
469
718
592
1000
680
560
850
700
659
560
846
700
680
560
846
700
1250
770
634
960
791
750
634
935
791
770
634
935
791
1500
867
714
1071
882
821
714
1011
882
865
714
1011
882
1750
956
788
1165
959
880
788
1078
959
932
788
1078
959
2000
1037
854
1250
1029
934
854
1133
1029
991
854
1133
1029
The ampacities of this table are those contained in Tables D8B and D9B of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 1, and the following conditions:
(a) The load is CONTINUOUS, and
(b) either end terminates at a fusible switch or circuit breaker.
36
4/Phase
Detail 4
4/Phase
Detail 5
9B
8B
6/Phase
Detail 6
9B
8B
9B
8B
6/Phase
Detail 7
9B
8B
100%
80%
100%
80%
100%
80%
100%
80%
-
-
100%
80%
100%
80%
158
133
203
172
162
133
208
172
129
165
140
133
179
172
178
154
229
200
187
154
242
200
145
186
157
154
202
200
201
179
258
231
217
179
280
231
163
210
178
228
227
210
291
270
246
210
315
270
183
236
200
256
247
231
317
298
267
231
343
298
200
256
217
278
291
375
371
292
318
291
408
371
237
304
258
331
352
452
383
361
489
462
284
365
309
396
382
491
419
410
534
518
308
397
340
433
431
554
469
596
592
348
447
379
482
488
627
542
683
393
505
437
551
554
691
604
753
446
556
487
607
605
746
660
813
487
600
531
655
647
793
706
865
520
637
568
696
686
832
749
909
552
669
602
730
The columns with the heading 80% denote that equipment identified in (b) above
is not marked as certified to carry its nameplate ampere rating continuously.
The columns with the heading 100% denote that equipment identified in (b) above
is marked as certified to carry its nameplate ampere rating continuously.
Contact General Cable toll-free at (800) 661-1451
www.nual.com
37
Applicable Installation Configurations for Single-Cond
Diagram 2
DETAIL 1: 1 conductor per phase
DETAIL 2: 2 condu
760
760
290
OR
190
190
480
190
690
190
190
480
190
640
DETAIL 3: 4 conductors per phase
DETAIL 4
760
760
190
190
OR
830
190
640
190
190
DETAIL 2: 2 conductors per phase
190
190
190
830
760
190
760
190
760
640
190
190
480
450
OR
190
640
190
190
190
480
190
640
190
450
DETAIL 4: 6 conductors per phase
760
190
Note: All dimensions in mm.
760
190
640
190
38
640
190
190
DETAIL 1: 1 conductor per phase
DETAIL 2: 2 conductors
ductors in Underground Raceways
760
290
OR
190
190
190
480
190
690
190
190
480
DETAIL 4: 6 co
760
760
190
190
190
190
640
DETAIL 3: 4 conductors per phase
OR
830
640
190
190
DETAIL 2: 2 conductors per phase
190
190
190
190
830
760
190
760
190
760
640
190
190
480
450
OR
190
640
190
190
0
80
190
760
190
640
190
450
DETAIL 4: 6 conductors per phase
760
760
190
190
640
640
190
190
830
190
190
190
190
190
190
190
1200
Contact General Cable toll-free at (800) 661-1451
www.nual.com
39
190
Table 5-7
Allowable Ampacities for Single-Conductor
Cable in Underground Raceways –
Non-Continuous Loads (See Diagram 2)
1/Phase
Detail 1
Size, AWG
or kcmil
2/Phase
Detail 2
11A
10A
11A
10A
1/0
180
231
157
201
2/0
205
264
178
228
3/0
235
301
203
260
4/0
269
345
231
296
250
296
379
253
325
350
360
461
306
391
500
442
564
372
475
600
488
621
409
521
750
556
706
464
589
1000
653
823
541
682
1250
738
920
608
759
1500
813
1004
667
824
1750
880
1077
719
880
2000
940
1139
766
928
The ampacities of this table are those contained in Tables D10A and D11A of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 2 and the following conditions:
(a) For any load, the cable terminates at equipment of any type other than a fusible switch
or circuit breaker; or
(b) The load is NON-CONTINUOUS and either end of the cable terminates at a fusible
switch or circuit breaker.
40
4/Phase
Detail 3
6/Phase
Detail 4
11A
10A
11A
10A
123
159
114
146
140
180
128
164
158
204
145
186
180
231
164
211
197
252
179
230
236
303
213
275
283
364
257
330
314
404
284
365
349
448
315
406
409
526
370
474
457
571
413
515
501
618
452
556
538
659
484
592
571
692
513
622
Contact General Cable toll-free at (800) 661-1451
www.nual.com
41
Table 5-8
Allowable Ampacities for Multi-Conductor
Cable Directly Buried in the Earth –
Non-Continuous Loads (See Diagram 2)
1/Phase
Detail 1
Size, AWG
or kcmil
11B
10B
11B
100%
80%
100%
80%
100%
1/0
162
133
208
172
157
2/0
187
154
242
200
178
3/0
217
179
280
231
203
4/0
255
210
327
270
231
250
281
231
361
298
253
350
353
291
450
371
306
500
438
361
561
462
372
600
488
410
621
518
409
750
556
469
706
592
464
1000
653
560
823
700
541
1250
738
634
920
791
608
1500
813
714
1004
882
667
1750
880
788
1077
959
719
2000
940
854
1139
1029
766
The ampacities of this table are those contained in Tables D10B and D11B of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 2 and the following conditions:
(a) The load is CONTINUOUS, and
(b) either end terminates in at a fusible switch or circuit breaker.
42
2/Phase
Detail 2
4/Phase
Detail 3
10B
6/Phase
Detail 4
11B
10B
11B
10B
80%
100%
80%
-
-
-
-
133
201
172
123
159
114
146
154
228
200
140
180
128
164
179
260
231
158
204
145
186
210
296
270
180
231
164
211
231
325
298
197
252
179
230
291
391
371
236
303
213
275
361
475
462
283
364
257
330
521
314
404
284
365
589
518
349
448
315
406
682
409
526
370
474
759
457
571
413
515
824
501
618
452
556
880
538
659
484
592
928
571
692
513
622
The columns with the heading 80% denote that the equipment identified in (b) above
is not marked as certified to carry its nameplate ampere rating continuously.
The columns with the heading 100% denote that the equipment identified in (b) above
is marked as certified to carry its nameplate ampere rating continuously.
Contact General Cable toll-free at (800) 661-1451
www.nual.com
43
Applicable Installation Configurations for Multi-Condu
Diagram 3
DETAIL 1: 1 cable per phase
DETAIL 2: 2 cables per
915
190
DETAIL 4: 4 cables per phase
915
cable per phase
DETAIL 2: 2 cables per phase
190
915
DETAIL 3: 3 cables p
190
DETAIL 6: 6 cables per phase
190
915
190
190
cables per phase
DETAIL 5: 5 cables per phase
190
915
hase
190
190
190
190
190
190
190
DETAIL 3: 3 cables per phase
190
190
190
915
915
cables per phase
915
190
190
DETAIL 5: 5 cables per phase
90
190
190
190
190
915
Note: All dimensions in mm.
44
190
190
190
190
uctors Directly Buried in the Earth
DETAIL 1: 1 cable per phase
DETAIL 2: 2 cables per phase
915
91
190
DETAIL 4: 4 cables per phase
DETA
915
cables per phase
DETAIL 3: 3 cables per phase
190
190
190
915
915
DETAIL 6: 6 cables per phase
DETAIL 1: 1 cable per phase
DETAIL 2: 2 cables per phase
915
190
190
915
190
915
DETAIL 5: 5 cables per phase
190
190
190
190
190
915
190
DETAIL 4: 4 cables per phase
190
DETAIL 5: 5 cables
190
190
190
915
915
190
190
190
190
DETAIL 6: 6 cables per phase
190
915
190
190
190
Contact General Cable toll-free at (800) 661-1451
190
www.nual.com
190
45
Table 5-9
Allowable Ampacities for Multi-Conductor
Cable Directly Buried in the Earth –
Continuous Loads (See Diagram 3)
1/Phase
Detail 1
Size, AWG
or kcmil
2/Phase
Detail 2
3/Phase
Detail 3
13A
12A
13A
12A
13A
12A
1/0
190
243
164
209
146
186
2/0
217
274
186
235
166
209
3/0
242
311
207
266
184
236
4/0
280
360
238
306
211
271
250
304
383
258
326
229
288
350
366
470
309
397
273
350
500
440
548
370
460
325
404
600
486
600
406
502
356
440
750
540
667
450
556
393
486
1000
613
758
508
628
444
548
1250
684
831
562
682
488
593
1500
734
889
600
727
520
630
1750
774
927
631
755
545
653
2000
809
962
657
781
567
674
The ampacities of this table are those contained in Tables D12A and D13A of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 3, and the following conditions:
(a) For any load, the cable terminates at equipment of any type other than a fusible switch
or circuit breaker; or
(b) The load is NON-CONTINUOUS and either end of the cable terminates at a fusible
switch or circuit breaker.
46
4/Phase
Detail 4
5/Phase
Detail 5
6/Phase
Detail 6
13A
12A
13A
12A
13A
12A
137
174
129
164
124
157
155
195
146
184
140
176
171
220
161
207
154
198
197
253
185
237
177
227
213
268
200
252
192
242
254
326
238
306
228
293
302
375
283
352
271
337
330
408
309
383
296
366
364
450
341
421
326
403
411
508
384
475
367
454
451
547
421
511
402
488
480
581
448
542
427
517
503
602
469
561
447
535
522
621
487
578
464
552
Contact General Cable toll-free at (800) 661-1451
www.nual.com
47
Table 5-10
Allowable Ampacities for Multi-Conductor
Cable Directly Buried in the Earth –
Continuous Loads (See Diagram 3)
1/Phase
Detail 1
Size, AWG
or kcmil
13B
2/Phase
Detail 2
12B
13B
12B
100%
80%
100%
80%
100%
80%
100%
80%
1/0
162
133
208
172
162
133
208
172
2/0
187
154
242
200
186
154
235
200
3/0
217
179
281
231
207
179
266
231
4/0
255
210
327
270
238
210
306
270
250
281
231
361
298
258
231
326
298
350
353
291
451
371
309
291
397
371
500
438
361
561
462
370
600
486
410
629
518
406
502
750
540
469
667
592
450
556
1000
613
560
758
700
508
628
1250
684
634
831
791
562
682
1500
734
714
889
882
361
460
600
727
1750
774
927
631
755
2000
809
962
657
781
The ampacities of this table are those contained in Tables D12B and D13B of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 3, and the following conditions:
(a) The load is CONTINUOUS, and
(b) either end terminates in at a fusible switch or circuit breaker.
48
3/Phase
Detail 3
13B
4/Phase
Detail 4
13B
13B
12B
13B
80%
100%
80%
100%
80%
100%
80%
-
-
-
-
146
133
186
172
137
133
174
172
129
164
124
157
166
154
209
200
155
184
179
236
231
210
271
270
12B
6/Phase
Detail 6
100%
211
12B
5/Phase
Detail 5
154
171
12B
195
146
184
140
176
220
161
207
154
198
197
253
185
237
177
227
229
288
213
268
200
252
192
242
273
350
254
326
238
306
228
293
325
404
302
375
283
352
271
337
356
440
330
408
309
383
296
366
393
486
364
450
341
421
326
403
444
548
411
508
384
475
367
454
488
593
451
547
421
511
402
488
520
630
480
581
448
542
427
517
545
653
503
602
469
561
447
535
567
674
522
621
487
578
464
552
The columns with the heading 80% denote that the equipment identified in (b) above
is not marked as certified to carry its nameplate ampere rating continuously.
The columns with the heading 100% denote that the equipment identified in (b) above
is marked as certified to carry its nameplate ampere rating continuously.
Contact General Cable toll-free at (800) 661-1451
www.nual.com
49
Applicable Installation Configurations for Multi-Condu
Diagram 4
DETAIL 1:DETAIL
1 cable1:per
1 cable
phase
per phase
DETAIL 2:DETAIL
2 cables
2: 2per
cables
phase
per phase
290
760
760
760
760
290
290
290
290
290
190
190
450
450
DETAIL 4:DETAIL
4 cables
4: 4per
cables
phase
per phase
DETAIL 5:DETAIL
5 cables
5: 5per
cables
phase
per phase
760
760
760
760
DETAIL 3: 3 cables per phase
190
450
190
760
450
190
190
640
290
190
190
450
450
190
190
190
640
450
DETAIL 6: 6 cables per phase
760
Note: All dimensions in mm.
The 2012 Code has a new 2x4 ductbank
configuration; detail 8-8 cable per phase
from 2012 CEC.
190
640
50
190
190
450
190
640
190
DETAIL 1: 1 cable per phase
uctors in Underground Raceways
DETAIL 2: 2 cables per phase
760
760
290
290
190
290
450
DETAIL 4: 4 cables per phase
DETAIL 5: 5 cables per phase
760
r 2:phase
DETAIL
2 cables per
phase2: 2 cables per phase
760
DETAIL
DETAIL 3: 3 cables per
phase3: 3 cables per p
760
760
76
190
760
190
450
64
290
290
290
290
190
190
190
190
190
450
450
450
190
190
640
190
640
450
er5phase
DETAIL
5:
cables per
phase5: 5 cables per phase
760
190
450
760
760
190
640
640
190
190
450
760
190
190
640
190
DETAIL
DETAIL 6: 6 cables per
phase6: 6 cables per p
190
190
450
Contact General Cable toll-free at (800) 661-1451
190
450
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190
450
51
Table 5-11
Allowable Ampacities for Multi-Conductor
Cable in Underground Raceways –
Non-Continuous Loads (See Diagram 4)
1/Phase
or kcmil
Detail 1
Size, AWG
2/Phase
Detail 2
3/Phase
Detail 3
15A
14A
15A
14A
15A
14A
1/0
142
180
129
164
119
152
2/0
163
206
148
187
136
172
3/0
186
235
168
213
155
196
4/0
214
269
192
242
177
223
250
236
298
212
267
194
244
350
288
361
256
321
233
293
500
351
437
310
386
281
350
600
388
480
341
423
309
383
750
435
538
381
471
344
425
1000
502
620
437
540
392
485
1250
556
676
480
583
429
521
1500
589
724
514
623
458
555
1750
632
756
541
648
481
576
2000
660
785
564
671
501
596
The ampacities of this table are those contained in Tables D14A and D15A of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 4, and the following conditions:
(a) F or any load, the cable terminates at equipment of any type other than a service box,
fusible switch or circuit breaker.
(b) T he load is NON-CONTINUOUS and either end of the cable terminates at a service box,
fusible switch or circuit breaker.
52
4/Phase
Detail 4
5/Phase
Detail 5
6/Phase
Detail 6
8/Phase
Detail 8
15A
14A
15A
14A
15A
14A
15A
14A
111
141
103
131
99
125
91
116
126
160
117
149
112
142
103
131
143
181
132
168
126
160
114
148
163
205
151
190
143
181
130
168
178
225
165
208
157
198
144
183
214
268
198
248
187
235
172
217
257
319
237
294
224
279
206
258
281
349
259
321
245
303
226
281
313
386
287
355
271
335
248
310
355
439
326
400
307
380
282
353
389
472
356
433
336
408
308
378
415
502
379
459
358
434
328
402
435
521
397
476
375
449
344
416
452
538
413
491
389
463
357
429
Contact General Cable toll-free at (800) 661-1451
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53
Table 5-12
Allowable Ampacities for Multi-Conductor
Cable in Underground Raceways –
Continuous Loads (See Diagram 4)
1/Phase
Detail 1
Size, AWG
or kcmil
2/Phase
Detail 2
15B
14B
15B
3/Phase
Detail 3
14B
15B
100%
80%
100%
80%
-
-
-
-
1/0
142
133
180
172
129
164
119
152
2/0
163
154
206
200
148
187
136
172
3/0
186
179
235
168
213
155
196
4/0
214
210
269
192
242
177
223
250
236
231
232
298
212
267
194
244
350
288
361
256
321
233
293
500
351
437
310
386
281
350
600
388
480
341
423
309
383
750
435
538
381
471
344
425
1000
502
620
437
540
392
485
1250
556
676
480
583
429
521
1500
589
724
514
623
458
555
1750
632
756
541
648
481
576
2000
660
785
564
671
501
596
The ampacities of this table are those contained in Tables D14B and D15B of the Canadian
Electrical Code Part I, 22nd Edition, 2012.
Ampacities are based on 90°C conductor temperature, 20°C ambient earth temperature,
configurations of Diagram 4, and the following conditions:
a) The load is CONTINUOUS, and
b) either end terminates at a service box, fusible switch or circuit breaker.
54
14B
4/Phase
Detail 4
15B
5/Phase
Detail 5
14B
15B
6/Phase
Detail 6
14B
15B
8/Phase
Detail 8
14B
15B
14B
-
-
-
-
-
-
-
-
111
141
103
131
99
125
91
116
126
160
117
149
112
142
103
131
143
181
132
168
126
160
114
148
163
205
151
190
143
181
130
168
178
225
165
208
157
198
144
183
214
268
198
248
187
235
172
217
257
319
237
294
224
279
206
258
281
349
259
321
245
303
226
281
313
386
287
355
271
335
248
310
355
439
326
400
307
380
282
353
389
472
356
433
336
408
308
378
415
502
379
459
358
434
328
402
435
521
397
476
375
449
344
416
452
538
413
491
389
463
357
429
The columns with the heading 80% denote that the equipment identified in (b) above is
not marked as certified to carry its nameplate ampere rating continuously.
The columns with the heading 100% denote that the equipment identified in (b) above
is marked as certified to carry its nameplate ampere rating continuously.
Contact General Cable toll-free at (800) 661-1451
www.nual.com
55
Notes and Corrections
Tables 5-5 to 5-12
Inclusive
General
The following notes and
corrections are based on notes
in Appendix B of the Canadian
Electrical Code. Ampacities
of underground installations
based on conditions of use not
as set out in the following notes
should either be justified by
precise calculation according
to the method of paragraph
4-004(1)(d) or (2)(d) or derived
in accordance with paragraph
4-004(1)(b) or (2)(b) of the
Canadian Electrical Code. The
ampacities shown in Tables
5-5 to 5-12 inclusive have been
determined using the calculation
in IEEE Standard 835, Standard
Power Cable Ampacity Tables,
for the cable arrangements
shown in Diagrams 1 to 4
inclusive. It is recommended
that ampacities for singleconductor cables directly buried
in the earth be selected from
Table 5-5 or 5-6 for installation
configurations shown in
Diagram 1, and those for cables
56
in separate underground
raceways be selected from
Table 5-7 or 5-8 for installation
configurations shown in Diagram
2. It is recommended that
ampacities for three-conductor
cables directly buried in the
earth be selected from Table
5-9 or 5-10 for installation
configurations shown in
Diagram 3, and those for cables
in separate underground
raceways be selected from
Table 5-11 or 5-12 for installation
configurations shown in
Diagram 4.
Voltage Drop
The allowable ampacities of
Tables 5-5 to 5-12 inclusive are
based on temperatures alone
and do not take voltage drop into
consideration. For voltage drop
information, refer to rule 8-102.
Conductor Temperature
Underground ampacities for
conductor temperatures of
75°C and 60°C respectively may
be obtained by multiplying the
appropriate ampacity at 90°C
conductor temperature from
Tables 5-5 to 5-12 inclusive by
Contact General Cable toll-free at (800) 661-1451
0.866 (for 75°C) or 0.756 (for 60°C).
General Cable NUAL Brand
conductors for underground use
are all rated for 90°.
Ambient Earth Temperature
Ampacities for underground
installations at ambient earth
temperatures other than the
assumed value of 20°C may
be obtained by multiplying
the appropriate underground
ampacity obtained from Tables
5-5 to 5-12 by the factor:
SQRT[(90-Tæ)/70] where
Tæ is the new ambient
earth temperature.
Stacked Arrangements
For “Stacked” arrangements
of two single-conductors per
phase in parallel (one row
located vertically over another
row), it is recommended that
they be obtained from Detail 5
of Tables 5-5 and 5-6 for directly
buried cables, or from Detail 2 of
Tables 5-7 and 5-8 for cables in
underground raceways.
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57
Notes and Corrections (continued)
Deratings Due to Sheath
Circulating Currents
For single-conductor metal
armoured and metal sheathed
cables in which the sheath,
armour, or bonding conductors
are bonded at more than one
point, the derating factors of
Canadian Electrical Code Rule
4-010 apply, unless the ampacity
has been determined by detailed
calculation according to the
method outlined in paragraphs
(1)(e), (1)(f), (2)(e) or (2)(f)
of Canadian Electrical Code
Rule 4-004.
Recommendations for 3, 5
and 7 Single-Conductors/Phase
in Parallel
It is recommended that
ampacities for three singleconductors per phase in parallel,
and for five single-conductors
per phase in parallel, with
spacings, directly buried in
the earth, be selected from
Table 5-5 or 5-6 for installation
configurations shown in
Diagram 1, Detail 5 and Detail 7,
respectively. It is recommended
that ampacities for three
58
single-conductors per phase
in parallel installed in separate
underground raceways be
selected from Table 5-7 or 5-8
for installation configurations
shown in Diagram 2, Detail 3
and Detail 4, respectively. It is
recommended that ampacities
for seven three-conductor
cables in seperate underground
raceways be selected from Table
5-11 or 5-12, Detail 7.
Note: The concept of “Load Factor” was
introduced into code ampacities for the
first time in the 2002 Code. Load Factor
is usually expressed as a percentage
of the average load/rated load. Cyclical
changes in demand on the cable during
the day can lower expected temperature
rise in insulated cables in the earth, and
consequently some jurisdictions may
permit smaller conductor sizes based on
load factors less than 100%, when it can
be shown or readily predicted that the
load factor is justified. The application of
load factors less than 100% can be found
in the source reference for underground
ampacities, IEEE Standard 835, Standard
Power Cable Ampacity Tables.
Recommendations for Groups
of Conductors in Twos
It is recommended that the
ampacities of groups of
conductors in twos and twoconductor cables, be obtained
from ampacity Tables 5-9 to
5-12, inclusive, as for groups of
three conductors, and threeconductor cables, respectively,
for the appropriate spacings
between groups and numbers
of conductors in parallel. The
neutral conductor of a single
phase, three wire system
need not be counted in the
determination of ampacities.
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59
Application Rules
Section 4: Conductors
4-004 Ampacity of Wires and
Cables (see Appendices B and I)*
(1) The maximum current that a
copper conductor of a given size
and insulation may carry shall be
as follows:
(a) single-conductor and singleconductor metal-sheathed or
armoured cable, in a free air run,
with a cable spacing not less
than 100% of the larger cable
diameter, as specified
in Table 1;
(b) one, two, or three conductors
in a run of raceway, or 2- or
3-conductor cable, except as
indicated in Subrule (1)(d), as
specified in Table 2;
(c) four or more conductors in
a run of raceway or cable, as
specified in Table 2 with the
correction factors applied as
specified in Table 5C;
(d) single-conductor and 2-, 3-,
and 4-conductor cables and
single-conductor and 2-, 3-, and
4-conductor metal-armoured
and metal-sheathed cables, in
conductor sizes No. 1/0 AWG and
60
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendices B and 1
larger, installed in accordance
with configurations described
in Diagrams B4-1 to B4-4 in an
underground run, directly buried
or in a raceway, as specified in
Tables D8A through D15B.
(e) underground configurations
not specified in Item (d), in
conductor sizes No. 1/0 AWG and
larger, as calculated by the IEEE
835 calculation method; and
(f) underground configurations in
conductor sizes smaller than No.
1/0 AWG, as specified in Item (b)
or as calculated by the IEEE 835
calculation method.
(2) The maximum current that an
aluminum conductor of a given
size and insulation may carry
shall be as follows:
(a) single-conductor and singleconductor metal-sheathed or
armoured cable, in a free air run,
with a cable spacing not less
than 100% of the larger cable
diameter, as specified in Table 3;
(b) one, two, or three conductors
in a run of raceway, or 2- or
3-conductor cable, except as
indicated in Subrule (2)(d), as
specified in Table 4;
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(c) four or more conductors in
a run of raceway or cable, as
specified in Table 4 with the
correction factors applied as
specified in Table 5C; and
(d) single-conductor and 2-, 3-,
and 4-conductor cables and
single-conductor and 2-, 3-, and
4-conductor metal-armoured
and metal-sheathed cables, in
conductor sizes No. 1/0 AWG and
larger, in an underground run,
directly buried or in a raceway,
as calculated by the method of
IEEE 835.
(3) A neutral conductor that
carries only the unbalanced
current from other conductors,
as in the case of normally
balanced circuits of three or
more conductors, shall not
be counted in determining
ampacities as provided for in
Subrules (1) and (2).
(4) When a load is connected
between a single-phase
conductor and the neutral,
or between each of two phase
conductors and the neutral,
of a three-phase, 4-wire system,
the common conductor carries
a current comparable to that in
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61
Application Rules
the phase conductors and shall
be counted in determining the
ampacities as provided for in
Subrules (1) and (2).
(5) The maximum allowable
ampacity of neutral supported
cable shall be as specified
in Tables 36A and 36B.
(6) A bonding conductor shall
not be counted in determining
the ampacities as provided
for in Subrules (1) and (2).
(7) The correction factors
specified in this Rule (a) shall
apply only to, and shall be
determined from, the number of
power and lighting conductors in
a cable or raceway; and (b) shall
not apply to conductors installed
in auxiliary gutters.
(8) The ampacity correction
factors of Table 5A shall apply
where conductors are installed
in an ambient temperature
exceeding or anticipated to
exceed 30°C.
(9) Where the free air spacing
between adjacent singleconductor cables is maintained
at not less than 25% nor more
than 100% of the diameter of
62
the largest cable, the ampacity
shall be obtained from Subrules
(1)(a) and (2)(a) for copper
and aluminum conductors
respectively, multiplied by the
correction factor obtained
from Table 5D.
(10) Where up to and including
four single-conductor cables
in free air are spaced at less
than 25% of the diameter of the
largest conductor or cable, the
ampacity shall be the same as
that obtained from Subrules
(1)(b) and (2)(b) for copper
and aluminum conductors
respectively, multiplied by
the correction factor obtained
from Table 5B.
(11) Notwithstanding Subrule
(10), where not more than
four non-jacketed singleconductor mineral-insulated
cables are grouped together
in conformance with Rule
4-010(3) and are installed on
a messenger or as open runs
with a maintained free air space
of not less than 2.15 times the
diameter of the largest cable
contained within the group and
adjacent groups or cables, the
ampacity of each conductor in
the group shall be permitted to
be determined in accordance
with Subrule (1)(a) without
applying the factors
of Table 5B.
(12) More than four singleconductor cables in free air,
when spaced at less than 25%
of the largest cable diameter,
shall have an ampacity obtained
from Tables 2 and 4 for copper
and aluminum conductors
respectively, multiplied by the
correction factor obtained from
Table 5C.
(13) Notwithstanding Subrule
(12), when the length of a
multiple conductor cable run is
less than 600 mm, the correction
factor from Table 5C shall
not apply.
(14) The ampacity of conductors
of different temperature ratings
installed in the same raceway
shall be determined on the basis
of the conductor having the
lowest temperature rating.
(15) The ampacity of conductors
added to a raceway and the
ampacity of the conductors
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already in the raceway shall be
determined in accordance with
the applicable Subrules.
(16) Where more than one
ampacity could apply for a given
circuit of single-conductor or
multi-conductor cables as a
consequence of a transition
from an underground portion
to a portion above ground, the
lower value shall apply except
as permitted in Subrule (17).
(17) Where the lower ampacity
portion of a cable installation
consisting of not more than
four-conductors in total does not
exceed 10% of the circuit length
or 3 m, whichever is less, the
higher ampacity shall
be permitted.
(18) When the load factor of
the load is less than 1.00 and is
known or can be supported by
documentation, the ampacity
of conductors derived from
Subrules (1)(d) and (2)(d) shall
be permitted to be increased by
application of that load factor in
the calculation of the ampacity.
(19) In consideration of the
increased ampacity of any
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63
Application Rules
conductor derived in accordance
with Subrule (16), no further
factors based on load diversity
shall be permitted.
(20) The ampacity of nickel or
nickel-clad conductors shall be
calculated using the method
described in IEEE 835.
(21) The maximum allowable
ampacity of bare or covered
conductors in free air shall be as
specified in Table 66.
4-006 Temperature Limitations
(see Appendix B)*
(1) Where equipment is marked
with a maximum conductor
termination temperature, the
maximum allowable ampacity of
the conductor shall be based on
the corresponding temperature
column from Table 1, 2, 3 or 4.
(2) Where equipment is
not marked with a maximum
conductor termination
temperature, 90˚C shall be
used by default.
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
64
4-010 Induced Voltages
and Currents in Metal Armour
or Sheaths of Single-Conductor
Cables (see Appendix B)*
(1) Where sheath currents in
single-conductor cables having
continuous sheaths of lead,
aluminum, stainless steel, or
copper are likely to cause the
insulation of the conductors to
be subjected to temperatures in
excess of the insulation ratings,
the cables shall be
(a) derated to 70% of the currentcarrying rating that would
otherwise apply;
(b) derated in accordance
with the manufacturer's
recommendations and in
compliance with Rule 2-030; or
(c) installed in a manner
that prevents the flow
of sheath currents.
(2) Circulating currents in singleconductor armoured cable shall
be treated in the same manner
as sheath currents in Subrule (1).
(3) Single-conductor cables
carrying more than 200 A shall
not enter ferrous metal boxes
through individual openings.
(4) Where single-conductor
cables carrying more than
200 A enter ferrous metal boxes,
precautions shall be taken to
prevent overheating of the wall
of the box by induction.
(5) Precautions to be taken
to prevent overheating of the
metal shall include the use of
non-ferrous or non-metallic box
connectors or cable glands,
locknuts, bushings, and
ground bushings.
(6) All cables making up a circuit
shall enter the box through
one common non-ferrous
or insulating plate having a
minimum thickness of 6.0 mm
unless a deviation is allowed in
accordance with Rule 2-030.
(7) Where single-conductor
mineral-insulated cables are
used, all current-carrying
conductors shall be grouped
together to minimize induced
voltage on the sheath.
Contact General Cable toll-free at (800) 661-1451
Section 8: Circuit Loading
and Demand Factors
8-100 Current Calculations
When calculating currents that
will result from loads, expressed
in watts or volt amperes, to
be supplied by a low-voltage
alternating-current system, the
voltage divisors to be used shall
be 120, 208, 240, 277, 347, 416,
480, or 600 as applicable.
8-102 Voltage Drop
(1) Voltage drop in an
installation shall
(a) be based upon the calculated
demand load of the feeder or
branch circuit;
(b) not exceed 5% from the
supply side of the consumer's
service (or equivalent) to the
point of utilization; and
(c) not exceed 3% in a feeder
or branch circuit.
(2) For the purposes of Subrule
(1) the demand load on a branch
circuit shall be the connected
load, if known; otherwise it
shall be 80% of the rating of the
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65
Application Rules
overload or overcurrent devices
protecting the branch circuit,
whichever is smaller.
8-104 Maximum Circuit Loading
(see Appendix B)*
(1) The ampere rating of a
consumer's service, feeder,
or branch circuit shall be the
ampere rating of the overcurrent
device protecting the circuit or
the ampacity of the conductors,
whichever is less.
(2) The calculated load in a
circuit shall not exceed the
ampere rating of the circuit.
(3) The calculated load in a
consumer's service, feeder,
or branch circuit shall be
considered a continuous load
unless it can be shown that
in normal operation it will not
persist for
(a) a total of more than 1 h in any
two-hour period if the load does
not exceed 225 A; or
(b) a total of more than 3 h in
any six-hour period if the load
exceeds 225 A.
(4) Where a fused switch
or circuit breaker is marked
66
for continuous operation at
100% of the ampere rating of
its overcurrent devices, the
continuous load as determined
from the calculated load shall
not exceed
(a) 100% of the rating of the
circuit where the ampacity of the
conductors is based on Column
2, 3, or 4 of Table 2 or 4; or
(b) 85% of the rating of the
circuit where the ampacity of the
conductors is based on Column
2, 3, or 4 of Table 1 or 3.
(5) Where a fused switch
or circuit breaker is marked
for continuous operation at
80% of the ampere rating of
its overcurrent devices, the
continuous load as determined
from the calculated load
shall not exceed
(a) 80% of the rating of the
circuit where the ampacity of the
conductors is based on Column
2, 3, or 4 of Table 2 or 4; or
(b) 70% of the rating of the
circuit where the ampacity of the
conductors is based on Column
2, 3, or 4 of Table 1 or 3.
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
(6) If other derating factors are
applied to reduce the conductor
ampacity, the conductor size
shall be the greater of that so
determined or that determined by
Subrule (4) or (5).
(7) Notwithstanding the
requirements of Rule 4-004(1)(d)
and (2)(d), the ampacity of the
underground conductors shall
not exceed in any case those
determined by Subrules (4)(b)
and (5)(b) of this rule.
8-106 Use of Demand Factors
(1) The size of conductors
and switches computed in
accordance with this Section
shall be the minimum used
except that, if the next smaller
standard size in common use
has an ampacity not more than
5% less than this minimum, the
smaller size conductor shall
be permitted.
(2) In any case other than
a service calculated in
accordance with Rules 8-200
and 8-202, where the design
of an installation is based on
requirements in excess of those
given in this Section, the service
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and feeder capacities shall be
increased accordingly.
(3) Where two or more loads are
installed so that only one can be
used at any one time, the one
providing the greatest demand
shall be used in determining the
calculated demand.
(4) Where it is known that
electric space-heating and
air-conditioning loads are
installed and will not be used
simultaneously, whichever is
the greater load shall be used
in calculating the demand.
(5) Where a feeder supplies
loads of a cyclic or similar
nature such that the maximum
connected load will not be
supplied at the same time,
the ampacity of the feeder
conductors shall be permitted to
be based on the maximum load
that may be connected at any
one time.
(6) The ampacity of conductors
of feeders or branch circuits
shall be in accordance with the
Section(s) dealing with
the respective equipment
being supplied.
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67
Application Rules
(7) Notwithstanding the
requirements of this Section, the
ampacity of the conductors of
a feeder or branch circuit need
not exceed the ampacity of the
conductors of the service or
of the feeder from which they
are supplied.
(8) Where additional loads
are to be added to an existing
service or feeder, the augmented
load shall be permitted to be
calculated by adding the sum
of the additional loads, with
demand factors as permitted
by this Code to the maximum
demand load of the existing
installation as measured over the
most recent 12-month period, but
the new calculated load shall be
subject to Rule 8-104(4) and (5).
Section 12: Conductors –
Wiring Methods
12-012 Underground Installations
(see Appendix B)*
(1) Direct buried conductors,
cables, or raceways shall be
installed to meet the minimum
cover requirements of Table 53.
(2) The minimum cover
requirements shall be permitted
to be reduced by 150 mm
where mechanical protection
is placed in the trench over the
underground installation.
(3) Mechanical protection shall
consist of one of the following
and, when in flat form, shall be
wide enough to extend at least
50 mm beyond the conductor,
cables, or raceways on
each side
(a) treated planking at least
38 mm thick
(b) poured concrete at least
50 mm thick
(c) concrete slabs at least
50 mm thick
(d) concrete encasement
at least 50 mm thick; or
(e) other suitable material.
(4) Direct buried conductors or
cables shall be installed so that
they run adjacent to each other
and do not cross over each other
and with a layer of screened
sand with a maximum particle
size of 4.75 mm or screened
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
68
earth at least 75 mm deep both
above and below the conductors.
(5) Where conductors or
cables rise for terminations
or splices or where access is
otherwise required, they shall
be protected from mechanical
damage by location or by rigid
conduit terminated vertically
in the trench and including a
bushing or bell end fitting, or
other acceptable protection,
at the bottom end from 300 mm
above the bottom of the trench
to at least 2 m above finished
grade, and beyond that as may
be required by other Rules of the
Code, and with sufficient slack
provided in the conductors at the
bottom end of the conduit so that
the conductors enter the conduit
from a vertical position.
(6) Where a deviation has been
allowed in accordance with
Rule 2-030, cables buried directly
in earth shall be permitted to be
spliced or tapped in trenches
without the use of splice boxes,
and such splices and taps shall
be made by methods and
with material approved
for the purpose.
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12-106 Multi- and
Single-Conductor Cables
(1) Where multi-conductor
cable is used, all conductors
of a circuit shall be contained
in the same multi-conductor
cable except that, where it is
necessary to run conductors in
parallel due to the capacity of
an ac circuit, additional cables
shall be permitted to be used,
provided that any one such cable
(a) includes an equal number of
conductors from each phase and
the neutral; and
(b) shall be in accordance with
Rule 12-108.
(2) A multi-conductor cable shall
not contain circuits of different
systems except as permitted
in Rule 12-3030.
(3) Where single-conductor
cables are used, all singleconductor cables of a circuit
shall be of the same type and
temperature rating and, if run in
parallel, shall be in accordance
with Rule 12-108.
(4) Single-conductor armoured
cable used as a current-carrying
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69
Application Rules
conductor shall be of a type
having non-magnetic armour.
(5) A single-conductor cable
carrying a current over 200 A
shall be run and supported
in such a manner that the
cable is not encircled by
magnetic material.
12-108 Conductors in Parallel
(see Appendix B)*
(1) Ungrounded and grounded
circuit conductors of similar
onductivity in sizes No. 1/0 AWG
and larger, copper or aluminum,
shall be permitted to be installed
in parallel sets provided that
each parallel phase or grounded
conductor set is individually
comprised of conductors that are
(a) free of splices throughout the
total length;
(b) the same circular mil area;
(c) the same type of insulation;
(d) terminated in the
same manner;
(e) the same conductor
material; and
(f) the same length.
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
70
(2) Notwithstanding Subrule (1)
(a), a single splice per conductor
shall be permitted
(a) to meet the requirements
of Rule 4-006; and
(b) where spliced in the
same manner.
(3) In parallel sets, conductors
of one phase, polarity, or
grounded circuit conductor
shall not be required to have the
same characteristics as those
of another phase, polarity, or
grounded circuit conductor.
(4) The orientation of singleconductor cables in parallel,
with respect to each other and
to those in other phases, shall
be such as to minimize the
difference in inductive
reactance and the unequal
division of current.
(5) Conductors of similar
conductivity in sizes smaller
than No. 1/0 AWG copper shall
be permitted in parallel to supply
control power to indicating
instruments and devices,
contactors, relays, solenoids,
and similar control devices,
provided that
(a) they are contained within
one cable;
(b) the ampacity of each
individual conductor is sufficient
to carry the entire load
current shared by the parallel
conductors; and
(c) the overcurrent protection is
such that the ampacity of each
individual conductor will not be
exceeded if one or more of the
parallel conductors becomes
inadvertently disconnected.
(6) Where parallel conductors
include grounded circuit
conductors, each parallel set
shall have a separate grounded
circuit conductor.
(7) Where the size of neutral
conductors is reduced in
conformance with Rule 4-024,
neutral conductors smaller
than No. 1/0 AWG shall be
permitted in circuits run in
parallel, provided that they are
installed in conformance with the
requirements of Subrule (1)(a),
(b), (c), (d), and (e).
12-118 Termination and Splicing
of Aluminum Conductors
(1) Adequate precaution shall
be given to the termination and
splicing of aluminum conductors,
including the removal of
insulation and separators, the
cleaning (wire brushing) of
stranded conductors, and the
compatibility and installation
of fittings.
(2) A joint compound, capable
of penetrating the oxide film
and preventing its reforming,
shall be used for terminating
or splicing all sizes of stranded
aluminum conductors, unless the
termination or splice is approved
for use without compound and
is so marked.
(3) Equipment connected to
aluminum conductors shall
be specifically approved for
the purpose and be so
marked, except
(a) where the equipment has
only leads for connection to the
supply; and
(b) equipment such as outlet
boxes having only
grounding terminals.
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71
Application Rules
(4) Aluminum conductors
shall not be terminated or
spliced in wet locations unless
the termination or splice is
adequately protected
against corrosion.
(5) Field-assembled connections
between aluminum lugs and
aluminum or copper busbars
or lugs, involving bolts or studs
9.5 mm diameter or larger, shall
include as part of the joint any of
the following means of allowing
for expansion of the parts:
(a) a conical spring washer;
(b) a helical spring washer of
the heavy series, provided that
a flat steel washer of thickness
not less than one-sixth of the
nominal diameter of the bolt
or stud is interposed between
the helical washer and any
aluminum surface against which
it would bear; or
(c) aluminum bolts or studs,
provided that all the elements in
the assembled connection are of
aluminum.
(6) Connection of aluminum
conductors to wiring devices
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
72
having wire-binding terminal
screws, around which
conductors can be looped under
the head of the screw, shall be
made by forming the conductor
in a clockwise direction around
the screw into three-fourths of
a complete loop, and only one
conductor shall be connected to
any one screw.
Armoured Cable
12-600 Armoured Cable Work Rules
Rules 12-602 to 12-618 apply only
to armoured cable work.
12-602 Use (see Appendix B)*
(1) Armoured cable shall be
permitted to be installed in or on
buildings or portions of buildings
of either combustible or noncombustible construction.
(2) Armoured cable shall be of
the type listed in Table 19 as
suitable for direct burial if used
(a) for underground runs;
(b) for circuits in masonry or
concrete, provided that the cable
is encased or embedded in at
least 50 mm of the masonry or
concrete; or
(c) in locations where it will be
exposed to weather, continuous
moisture, excessive humidity,
or to oil or other substances
having a deteriorating effect
on the insulation.
(3) Notwithstanding Subrule
(2), armoured cable in which
the armouring is made wholly
or in part of aluminum shall
not be embedded in concrete
containing reinforcing
steel, unless
(a) the concrete is known to
contain no chloride additives; or
(b) the armour has been treated
with a bituminous base of paint
or other means to prevent
galvanic corrosion
of the aluminum.
(4) Where armoured cables are
laid in or under cinders or cinder
concrete, they shall be protected
from corrosive action by a
grouting of non-cinder concrete
at least 25 mm thick entirely
surrounding them unless they
are 450 mm or more under the
cinders or cinder concrete.
(5) In buildings of noncombustible construction,
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armoured cables having
conductors not larger than
No. 10 AWG copper or aluminum
shall be permitted to be laid on
the face of the masonry or other
material of which the walls and
ceiling are constructed and shall
be permitted to be buried in the
plaster finish for extensions from
existing outlets only.
(6) Armoured cable with overall
jacket shall be permitted for
use in a raceway when it is
installed in accordance with
Rule 12-902(2).
12-604 Protection for
Armoured Cables in Lanes
If subject to mechanical injury
and unless otherwise protected,
steel guards of not less than
No. 10 MSG, adequately secured,
shall be installed to protect
armoured cables less than
2 m above grade in lanes
and driveways.
12-606 Use of ThermoplasticCovered Armoured Cable
Armoured cable of the type
listed in Table 19 as suitable for
direct earth burial and having
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73
Application Rules
a thermoplastic outer covering
shall be used only where the
outer covering will not be
subjected to mechanical injury.
12-608 Continuity
of Armoured Cable
Armoured cable shall be run
in a manner such that the
mechanical and electrical
continuity of the armour is
maintained throughout the run,
and the armour of cables shall
be mechanically and electrically
secured to all equipment to
which it is attached.
12-610 Terminating
Armoured Cable
(1) Where conductors issue from
armour, they shall be protected
from abrasion by bushings of
insulating material or equivalent
devices.
(2) Where conductors are
No. 8 AWG or larger, copper or
aluminum, such protection shall
consist of
(a) insulated-type bushings,
unless the equipment is
equipped with a hub having a
smoothly rounded throat; or
74
(b) insulating material fastened
securely in place that will
separate the conductors from
the armoured cable fittings and
afford adequate resistance to
mechanical injury.
(3) Where armoured cable is
fastened to equipment, the
connector or clamp shall be
of such design as to leave
the insulating bushing or its
equivalent visible for inspection.
(4) Where conductors connected
to open wiring issue from the
ends of armouring, they shall
be protected with boxes or with
fittings having a separately
bushed hole for each conductor.
12-612 Proximity to Knob-and-Tube
and Non-Metallic-Sheathed
Cable Systems
Where armoured cable is
used in a building in which
concealed knob-and-tube wiring
or concealed non-metallicsheathed cable wiring is
installed, the cable shall not be
fished if there is a possibility of
damage to the existing wiring.
12-614 Radii of Bends
in Armoured Cables
12-618 Running of Cable
Between Boxes, etc.
(1) Where armoured cables
are bent during installation,
the radius of the curve of the
inner edge of the bends shall
be at least 6 times the external
diameter of the armoured cable.
Armoured cable shall be
supported between boxes
and fittings in accordance
with Rule 12-510.
(2) Bends shall be made without
undue distortion of the armour
and without injury to its inner or
outer surfaces.
12-2200 Method of Installation
(see Appendix B)*
12-616 Concealed Armoured
Cable Installation
(1) Where armoured cable is run
through studs, joists, or other
members, it shall be
(a) located so that its outer
circumference is at least 32 mm
from the nearest edge of the
members; or
(b) protected from mechanical
injury where it passes through
the holes in the members.
(2) Where armoured cable is
installed immediately behind
baseboards, it shall be protected
from mechanical injury from
driven nails.
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
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Cable Trays
(1) Cable trays shall be installed
as a complete system using
fittings or other means to
provide adequate cable support
and bending radius before the
conductors are installed.
(2) The maximum design load and
associated support spacing shall
not exceed the load/span ratings
of the cable tray.
(3) Cable trays shall not pass
through walls except where the
walls are constructed of noncombustible material.
(4) Cable trays shall be permitted
to extend vertically through
floors in dry locations, if provided
with fire stops in accordance
with Rule 2-124, and if totally
enclosed where passing through
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75
Application Rules
and for a minimum distance of
2 m above the floor to provide
adequate protection from
mechanical injury.
(5) Cable trays shall be
adequately supported by noncombustible supports.
(6) The minimum clearances for
cable trays shall be
(a) 150 mm vertical clearance,
excluding depth of cable trays,
between cable trays installed in
tiers except that, where cables
of 50 mm diameter or greater
may be installed, the clearance
shall be 300 mm;
(b) 300 mm vertical clearance
from the top of the cable tray to
all ceilings, heating ducts, and
heating equipment and 150 mm
for short length obstructions;
(c) 600 mm horizontal clearance
on one side of cable trays
mounted adjacent to one another
or to walls or other obstructions,
where the width of the cable tray
installation does not exceed
1 m; and
another, where the width
of the cable tray installation
exceeds 1 m.
(7) At least one expansion joint
shall be installed in any cable
tray run where the expansion
of the cable tray due to the
maximum probable temperature
change during and after
installation can damage the
cable tray.
12-2202 Conductors in Cable Trays
(see Appendix B)*
(1) Conductors for use in cable
trays shall be as listed in Table
19 and, except as permitted in
Subrules (2) and (3), shall have
a continuous metal sheath or
interlocking armour.
(2) Type TC tray cable shall be
permitted in cable trays in areas
of industrial establishments that
are inaccessible to the public,
provided that the cable is
(a) installed in conduit, other
suitable raceway, or direct
buried, when not in cable tray;
(d) 600 mm horizontal clearance
on each side of cable trays
mounted adjacent to one
(b) provided with mechanical
protection where subject to
damage either during or after
installation;
76
* Please reference the Canadian Electrical Code
(CEC) Part 1, Appendix B
(c) no smaller than No. 1/0 AWG
if a single-conductor is used; and
(d) installed only where qualified
persons service the installation.
(3) Conductors having moistureresistant insulation and flametested non-metal coverings
or sheaths of a type listed in
Table 19 shall be permitted in
ventilated or non-ventilated
cable trays where not subject
to damage during or after
installation in
(a) electrical equipment vaults
and service rooms; and
(b) other locations that are
inaccessible to the public and
are constructed as a service
room where a deviation has been
allowed in accordance with
Rule 2-030.
(4) Single-conductors shall be
fastened to prevent excessive
movement due to fault-current
magnetic forces.
(5) Where single-conductors
are fastened to cable trays,
precautions shall be taken to
prevent overheating of the
fasteners due to induction.
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12-2204 Joints and Splices
within Cable Trays
Where joints and splices are
made on feeders or branch
circuits within cable trays, the
connectors shall be insulated
and shall be accessible.
12-2206 Connection to
Other Wiring Methods
Where cable trays are
connected to other wiring
methods, the arrangement shall
be such that the conductors will
not be subject to mechanical
damage or abrasion, and such
that effective bonding will
be maintained.
12-2208 Provisions for Bonding
(1) Where metal supports for
metal cable trays are bolted
to the tray and are in good
electrical contact with the
grounded structural metal frame
of a building, the tray shall be
deemed to be bonded to ground.
(2) Where the conditions of
Subrule (1) do not apply, the
metal cable tray shall be
adequately bonded at intervals
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77
Application Rules
not exceeding 15 m and the size
of bonding conductors shall be
based on the ampacity of the
largest ungrounded conductor
as specified in Rule 10-814 in the
circuits carried by the cable tray.
12-2210 Ampacities of
Conductors in Cable Trays
(1) In ventilated and ladder-type
cable trays, where the air space
between adjacent conductors,
cables, or both is maintained
at greater than 100% of the
diameter of the larger conductor
or cable, the ampacity of the
conductors or cables shall be the
value specified in Item (a) or (b):
(a) single-conductors, singleconductor metal-sheathed or
armoured cable, and singleconductor mineral-insulated
cable, as specified in Tables 1
and 3; and
(b) multi-conductor cables as
specified in Tables 2 and 4,
multiplied by the correction
factor in Table 5C for the number
of conductors in each cable.
(2) In ventilated and ladder-type
cable trays, where the air space
78
between adjacent conductors,
cables, or both is maintained
at not less than 25% nor more
than 100% of the diameter of
the larger conductor or cable,
the ampacity of the conductors
or cables shall be the value
specified in Subrule (1),
multiplied by the correction
factor specified in Table 5D for
the arrangement and number
of conductors or cables
involved, unless a deviation
has been allowed in accordance
with Rule 2-030 for other
correction factors.
cable tray in Subrule (3), Rule
4-004(7) shall apply.
(5) Where cable trays are
located in room temperatures
above 30°C, the temperature
correction factor of Table 5A
shall be applied to the ampacities
determined from Subrules (1), (2),
and (3) as applicable.
(3) In ventilated and ladder-type
cable trays, where the air space
between adjacent conductors,
cables, or both is less than 25%
of the diameter of the larger
conductor or cable, and for
any spacing in a non-ventilated
cable tray, the ampacity of the
conductors or cables shall be
the value as specified in Table 2
or 4 multiplied by the correction
factor specified in Table 5C for
the total number of conductors
in the cable tray.
(4) In determining the total
number of conductors in the
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79
Tables
NUAL Brand Conductor Ampacities in Air and Maximum
Permissible Number of Conductors in Conduit
RW90 600V
Ampacities
AWG or KCMIL
Table 3
Table 4
1/2”
3/4”
1”
60
45
2
5
8
6
85
55**
1
3
6
4
115
75
1
2
4
3
130
85
1
1
3
2
150
100
1
1
3
1
175
115
1
1
1
1/0
205
135
1
1
2/0
235
150
1
1
3/0
270
175
1
1
4/0
315
205
1
1
250
355
230
1
300
395
260
1
350
445
280
1
400
480
305
500
545
350
600
615
385
8
750
700
435
1000
845
500
1500
1070
585
†For 3-wire 120/240 V and 120/208 V service conductors for single dwellings, or for
feeder conductors supplying single dwelling units of row housing of apartment and
similar buildings, and sized in accordance with Rules 8-200(1), 8-200(2), and 8-202(1),
the allowable ampacity for No. 6 AWG shall be 60 A. In this case, the 5% adjustment
of Rule 8-106(1) cannot be applied.
80
Maximum Permissible Number of Conductors in Conduit †
Nominal Diameter of Conduit
1-1/4”
1-1/2”
2”
2-1/2”
3”
3-1/2”
4”
14
19
32
46
72
96
124
11
14
24
35
54
72
93
8
11
18
25
39
53
68
6
9
15
21
33
44
57
5
7
12
18
28
38
49
4
5
9
14
21
28
37
3
4
8
11
18
24
31
3
4
6
9
15
20
26
2
3
5
8
12
17
22
1
2
4
6
10
14
18
1
1
3
5
8
11
14
1
1
3
4
7
10
12
1
1
2
4
6
8
11
1
1
2
3
5
7
10
1
1
1
3
4
6
8
1
1
1
1
3
5
6
1
1
1
3
4
5
1
1
1
3
4
1
1
1
1
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81
Tables
Copper Conductor Ampacities in Air and Maximum
Permissible Number of Conductors in Conduit
RW90 600V
Ampacities
AWG or KCMIL
Table 1
Table 2
1/2”
3/4”
1”
14
35
25
9
16
25
12
40
30
7
12
20
10
55
40
5
9
15
8
80
55
2
4
7
6
105
75
1
3
5
4
140
95
1
2
4
3
165
115
1
1
3
2
190
130
1
1
3
1
220
145
1
1
1
1/0
260
170
1
1
2/0
300
195††
1
1
3/0
350
225
1
4/0
405
260
1
250
455
290
1
300
500
320
1
350
570
350
400
615
380
500
700
430
600
780
475
750
885
535
1000
1055
615
†For 3-wire 120/240 V and 120/208 V service conductors for single dwellings, or for
feeder conductors supplying single dwelling units of row housing of apartment and
similar buildings, and sized in accordance with Rules 8-200(1), 8-200(2), and 8-202(1),
the allowable ampacity for sizes No. 6 and No. 2/0 AWG shall be 60 A and 200 A,
respectively. In this case, the 5% adjustment of Rule 8-106(1) cannot be applied.
82
1
Maximum Permissible Number of Conductors in Conduit †
Nominal Diameter of Conduit
1-1/4”
1-1/2”
2”
2-1/2”
3”
3-1/2”
4”
45
61
101
144
200
200
200
35
48
79
113
175
200
200
27
37
61
87
134
179
200
13
18
30
43
67
90
116
10
13
23
32
50
67
87
7
10
16
23
36
49
63
6
8
14
20
31
41
53
5
7
11
17
26
35
45
3
5
8
12
19
25
33
3
4
7
10
16
22
28
2
3
6
8
13
18
23
1
3
5
7
11
15
19
1
2
4
6
9
12
16
1
1
3
5
7
10
13
1
1
3
4
6
8
11
1
1
2
3
5
7
10
1
1
1
3
5
7
9
1
1
1
2
4
5
7
1
1
1
3
4
6
1
1
2
3
4
1
1
1
3
3
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83
Tables
Table 5A – Correction Factors Applying to Tables 1, 2, 3, & 4
(Ampacity Correction Factors for Ambient Temperatures Above 30°C)
(See Rules 4-004(8) and 12-2210 and Tables 1 To 4, 57, And 58)
84
Ambient
Temp.
C°
60°
75°
90°
105°
35
0.91
0.94
0.96
0.97
40
0.82
0.88
0.91
0.93
45
0.71
0.82
0.87
0.89
50
0.58
0.75
0.82
0.86
55
0.41
0.67
0.76
0.82
60
—
0.58
0.71
0.77
65
—
0.47
0.65
0.73
70
—
0.33
0.58
0.68
75
—
—
0.5
0.63
80
—
—
0.41
0.58
90
—
—
—
0.45
100
—
—
—
0.26
110
—
—
—
—
120
—
—
—
—
130
—
—
—
—
140
—
—
—
—
Correction Factor
110°
125°
150°
200°
250°
0.97
0.97
0.98
0.99
0.99
0.94
0.95
0.96
0.97
0.98
0.9
0.92
0.94
0.95
0.97
0.87
0.89
0.91
0.94
0.95
0.83
0.86
0.89
0.92
0.94
0.79
0.83
0.87
0.91
0.93
0.75
0.79
0.84
0.89
0.92
0.71
0.76
0.82
0.87
0.9
0.66
0.73
0.79
0.86
0.89
0.61
0.69
0.76
0.84
0.88
0.5
0.61
0.71
0.8
0.85
0.35
0.51
0.65
0.77
0.83
—
0.4
0.58
0.73
0.8
—
0.23
0.5
0.69
0.77
—
—
0.41
0.64
0.74
—
—
0.29
0.59
0.71
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85
Tables
Table 5B – Correction Factors for Tables 1 & 3
(Where from 2 to 4 Single-Conductors are Present
and in Contact) (See Rules 4-004(9) and Tables 1, 3 and D3)
Number of Conductors
Correction Factors
2
0.90
3
0.85
4
0.80
Notes:
1) Where four-conductors form a three-phase-with-neutral system, the values for threeconductors may be used. Where three Conductors form a single-phase, three-wire
system, the values for two-conductors may be used.
2) Where more than four-conductors are in contact, the ratings for conductors in
raceways shall be used.
Table 5C – Ampacity Correction Factors for Tables 2 & 4
(See Rule 4-004 and Tables 2 and 4)
86
Number of Conductors
Ampacity Correction Factors
1-3
1.00
4-6
0.80
7-24
0.70
25-42
0.60
43 & up
0.50
Table 5D – Current Rating Correction Factors
Where Spacings are Maintained
(Ventilated and Ladder-Type Cable Trays) (See Rule 12-2210)
Number of Conductors
or Cables Horizontally
1
2
3
4
5
6
Vertically (Layers)
1
1.00
0.93
0.87
0.84
0.83
0.82
2
0.89
0.83
0.79
0.76
0.75
0.74
Table 8 – Maximum Allowable Percent
Conduit and Tubing Fill (See Rule 12-1014 & 38-032)
Number of Conductors or Multi-conductor Cables
Construction
1
2
3
4
Over 4
Conductors or
multi-conductor cables
(not lead-sheathed)
53
31
40
40
40
Lead-sheathed
conductors or
multi-conductor cables
55
30
40
38
35
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87
Tables
Table 9 – Cross-Sectional Areas of Conduit and Tubing
(See Rule 12-1014)
Normal
Conduit Size
Internal Diameter
(mm)
16 (1/2)
21 (3/4)
100%
55%
53%
15.8
107.8
4.13
103.9
20.9
189.2
4.6
182.3
27 (1)
26.6
306.7
5.23
295.5
35 (1-1/4)
35.1
530.7
5.99
511.4
41 (1-1/2)
40.9
722.4
7.71
696.1
53 (2)
52.5
1191
8.93
1147
63 (2-1/2)
62.7
1699
9.64
1637
78 (3)
79.9
2623
10.46
2528
91 (3-1/2)
90.1
3508
12.49
3381
103 (4)
102.3
4517
13.51
4353
116 (4-1/2)
114.5
5659
14.68
5453
129 (5)
128.2
7099
16
6841
155 (6)
154.1
10 251
17.47
9879
Note:
The dimensions shown are typical of metallic conduit and tubing. Other figures more accurately
representing the actual dimensions of a particular product may be substituted, when known. Dimensions
of other circular raceways may be obtained from the approved standard to which they are manufactured.
88
Cross-sectional Area of Conduit and Tubing (mm2)
40%
38%
35%
31%
30%
78.41
74.49
68.61
60.77
58.81
137.6
130.7
120.4
106.7
103.2
223
211.9
195.2
172.9
167.3
386
366.7
337.7
299.1
289.5
525.4
499.1
459.7
407.2
394
866
822.7
757.7
671.1
649.5
1236
1174
1081
957.5
926.7
1908
1812
1669
1479
1431
2551
2424
2233
1977
1914
3285
3121
2875
2546
2464
4115
3910
3601
3189
3086
5163
4905
4517
4001
3872
7456
7083
6524
5778
5592
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89
Tables
Table 10A – Dimensions of Cable
for Calculating Conduit and Tubing Fill
(When dimensions are not otherwise available.) (See Rule 12-1014)
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
600 V
Conductor
Size
AWG
KCMIL
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
R90XPLE†,
RW75XPLE†,
R90EP†,
RW75EP†,
RW90XLPE‡,
RW90EP‡,
600 V
Diameter
(mm)
Area
(mm2)
14
3.36
8.89
4.12
13.36
4.12
13.36
12
3.84
11.61
4.60
16.65
4.60
16.75
10
4.47
15.67
5.23
21.45
5.23
21.45
8
5.99
28.17
5.99
28.17
6.75
35.77
6
6.95
37.98
7.71
46.73
8.47
56.39
4
8.17
52.46
8.93
62.67
9.96
73.79
3
8.88
61.99
9.64
73.05
10.40
85.01
2
9.70
73.85
10.46
85.88
11.22
98.82
1
11.23
99.10
12.49
112.6
13.51
143.4
*Unjacketed
†Jacketed
††Includes EPCV
90
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
1000 V
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
1000 V
TWU,TWU75,
RWU90XLPE*
TW, TW75
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
2.80
6.18
3.28
8.47
3.36
8.89
4.88
18.70
3.84
11.61
5.36
22.56
4.17
13.63
4.47
16.57
5.97
27.99
5.49
23.66
5.99
28.17
7.76
47.29
6.45
32.71
7.71
46.73
8.72
59.72
8.23
53.23
8.93
62.67
9.95
77.76
8.94
62.83
9.64
73.05
10.67
89.42
9.76
74.77
10.46
85.88
11.48
103.5
11.33
100.9
12.49
122.6
13.25
137.9
Continued on Next Page
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91
Tables
Table 10A Continued (See Rule 12-1014)
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
600 V
Conductor
Size
AWG
KCMIL
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
1/0
12.27
118.3
13.53
143.9
14.55
166.4
2/0
13.44
141.9
14.70
169.8
15.72
194.2
3/0
14.74
170.6
16.00
201.0
17.02
227.5
4/0
16.21
206.4
17.47
239.7
18.49
268.5
250
17.90
251.8
19.17
288.5
21.21
353.2
300
19.30
292.6
20.56
332.1
22.60
401.2
350
20.53
331.0
21.79
372.9
23.83
446.0
400
21.79
373.0
23.05
417.3
25.09
494.5
450
22.91
412.2
24.17
458.8
26.21
539.5
500
23.95
450.5
25.21
499.2
27.25
583.2
600
26.74
561.7
27.24
582.9
30.04
708.8
700
28.55
640.0
29.05
662.6
31.85
796.5
750
29.41
679.3
29.91
702.6
32.71
840.3
800
30.25
718.7
30.75
742.6
33.55
884.0
900
31.85
796.6
32.35
821.8
35.15
970.2
1000
32.32
872.0
33.82
898.4
36.62
1053
1250
37.56
1108
38.32
1153
42.38
1411
1500
40.68
1300
41.44
1349
45.50
1626
1750
43.58
1492
44.34
1544
48.40
1840
2000
46.27
1681
47.03
1737
51.09
2050
Note:
Dimensions for aluminum conductors are subjected to the range of sizes to
which they are certified. Data is for compressed stranded conductos.
92
R90XPLE†,
RW75XPLE†,
R90EP,
RW75EP†,
RW90XLPE‡,
RW90EP,
600 V
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
1000 V
*Unjacketed
†Jacketed
††Includes EPCV
R90XLPE*,
RW75XLPE*,
RW90XLPE*,
1000 V
TWU,TWU75,
RWU90XLPE*
TW, TW75
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
Diameter
(mm)
Area
(mm2)
12.37
120.3
13.53
143.9
14.28
160.2
13.54
144.0
14.70
169.8
15.45
187.5
14.84
172.9
16.00
201.0
16.76
220.6
16.31
209.0
17.47
239.7
18.28
262.4
18.04
255.7
19.43
296.4
20.20
320.5
19.44
296
9.20.82
340.5
21.54
364.4
20.67
335.6
22.05
381.9
22.81
408.6
21.93
337.8
23.31
426.8
24.07
455.0
23.05
417.3
24.43
468.7
25.19
498.4
24.09
455.8
25.47
509.5
26.24
540.8
—
—
28.26
627.3
29.02
661.4
—
—
30.07
710.0
30.82
746.0
—
—
30.93
751.3
31.69
788.7
—
—
31.77
792.7
32.53
831.1
—
—
33.37
874.5
34.13
914.9
—
—
34.84
953.4
35.60
995.4
—
—
39.08
1200
39.08
1199
—
—
42.20
1399
42.96
1449
—
—
45.10
1598
45.86
1652
—
—
47.79
1794
48.55
1851
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93
Tables
Table 10B – Dimensions of Photovoltaic Cable
for Calculating Conduit and Tubing Fill (See Rule 12-1014)
Conductor
size
AWG or
kcmil
Dia.,
mm
RPV*, 1000 V
Area,
mm2
Dia.,
mm
RPV*, 2000 V
Area,
mm2
Dia.,
mm
Area,
mm2
14
3.37
8.92
4.13
13.4
4.89
18.78
12
3.84
11.58
4.6
16.62
5.36
22.56
10
4.47
15.69
5.23
21.48
5.99
28.18
8
5.99
28.18
5.99
28.18
7.27
41.51
6
6.95
37.94
7.71
46.69
8.23
53.2
4
8.17
52.42
8.93
62.63
9.45
70.14
3
8.88
61.93
9.64
72.99
10.16
81.07
2
9.7
73.9
10.46
85.93
10.98
94.69
1
11.23
99.05
12.49
122.5
13.01
132.9
1/0
12.25
117.9
13.51
143.4
14.03
154.6
2/0
13.42
141.4
14.68
169.3
15.2
181.5
3/0
14.74
170.6
16
201.1
16.52
214.3
4/0
16.21
206.4
17.47
239.7
17.99
254.2
250
17.9
251.6
19.16
288.3
19.94
312.3
300
19.3
292.6
20.56
332
21.34
357.7
*Unjacketed
†Jacketed
94
RPV*, 600 V
RPV†, 600 V
Dia.,
mm
Area,
mm2
RPV†, 1000 V
Dia.,
mm
Area,
mm2
RPVU*, 1000 V
2000 V
RPV†, 2000 V
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
RPVU†, 1000 V
2000 V
Dia.,
mm
Area,
mm2
4.13
13.4
4.89
18.78
5.65
25.07
4.89
18.78
5.65
25.07
4.6
16.62
5.36
22.56
6.12
29.42
5.36
22.56
6.12
29.42
5.23
21.48
5.99
28.18
7.51
44.3
5.99
28.18
6.75
35.78
7.51
44.3
7.51
44.3
8.79
60.68
7.77
47.42
9.29t
67.78
8.47
56.35
9.23
66.91
9.75
74.66
8.73
59.86
10.25
82.52
9.69
73.75
10.45
85.77
10.97
94.52
9.95
77.76
11.47
103.3
10.4
84.95
11.16
97.82
11.68
107.1
10.66
89.25
12.18
116.5
11.22
98.87
11.98
112.7
13.26
138.1
11.48
103.5
13.76
148.7
13.51
143.4
14.77
171.3
15.29
183.6
13.25
137.9
15.53
189.4
14.53
165.8
15.79
195.8
16.31
208.9
14.27
159.9
16.55
215.1
15.7
193.6
16.96
225.9
17.48
240
15.44
187.2
17.72
246.6
17.02
227.5
18.28
262.4
18.8
277.6
16.76
220.6
19.04
284.7
18.49
268.5
19.75
306.4
21.29
356
18.23
261
21.53
364.1
21.2
353
22.46
396.2
23.24
424.2
20.18
319.8
23.48
433
22.6
401.1
23.86
447.1
24.64
476.8
21.58
365.8
24.88
486.2
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95
Tables
Table 10B Continued (See Rule 12-1014)
Conductor
size
AWG or kcmil
RPV*, 600 V
RPV*, 1000 V
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
350
20.6
333.3
21.86
375.3
22.64
402.6
400
21.79
372.9
23.05
417.3
23.83
446
450
22.91
412.2
24.17
458.8
24.95
488.9
500
23.95
450.5
25.21
499.2
25.99
530.5
600
26.74
561.6
27.24
582.8
28.78
650.5
700
28.55
640.2
29.05
662.8
30.59
734.9
750
29.41
679.3
29.91
702.6
31.45
776.8
800
30.22
717.3
30.72
741.2
32.26
817.4
900
31.85
796.7
32.35
821.9
33.89
902.1
1000
33.32
872
33.82
898.3
35.36
982
1250
37.56
1108
38.32
1153
39.86
1248
1500
40.68
1300
41.44
1349
42.98
1451
1750
43.58
1492
44.34
1544
45.88
1653
2000
46.27
1681
47.03
1737
48.57
1853
*Unjacketed
†Jacketed
Note:
Aluminum conductors may not be available in the same range as copper conductors.
96
RPV*, 2000 V
RPV†, 600 V
Dia.,
mm
RPV†, 1000 V
RPV†, 2000 V
RPVU*, 1000 V 2000 V
RPVU†, 1000 V 2000 V
Area,
mm2
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
Dia.,
mm
Area,
mm2
23.9
448.6
25.16
497.2
25.94
528.5
22.88
411.2
26.18
538.3
25.09
494.4
26.35
545.3
27.13
578.1
24.07
455
27.37
588.4
26.21
539.5
27.47
592.7
28.25
626.8
25.19
498.4
28.49
637.5
27.25
583.2
28.51
638.4
29.29
673.8
26.23
540.4
29.53
684.9
30.04
708.7
30.54
732.5
32.08
808.3
29.04
662.3
32.34
821.4
31.85
796.7
32.35
821.9
33.89
902.1
30.85
747.5
34.15
915.9
32.71
840.3
33.21
866.2
34.75
948.4
31.71
789.7
35.01
962.7
33.52
882.5
34.02
909
35.56
993.1
32.52
830.6
35.82
1008
35.15
970.4
35.65
998.2
37.19
1086
34.15
915.9
37.45
1102
36.62
1053
37.12
1082
38.66
1174
35.62
996.5
38.92
1190
42.38
1411
43.14
1462
44.68
1568
39.86
1248
44.68
1568
45.5
1626
46.26
1681
47.8
1795
42.98
1451
47.8
1795
48.4
1840
49.16
1898
50.7
2019
45.88
1653
50.7
2019
51.09
2050
51.85
2111
53.39
2239
48.57
1853
53.39
2239
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97
Tables
Table 16 – Minimum Size Conductors for Bonding
Conductors (See Rules 10-204, 10-626, 10-814, 10-816, 10-906,
12-1814, 24-104, 24-202, 30-1030, 68-058 and 68-406)
Ampacity A, of largest
ungrounded conductor in
the circuit or equivalent for
multiple parallel conductors
not exceeeding
Copper Wire
AWG
Aluminum Wire
AWG
Note:
Size of Bonding Conductor
20
14
12
30
12
10
40
10
8
60
10
8
100
8
6
200
6
4
300
4
2
400
3
1
500
2
0
600
1
00
800
0
000
1000
00
0000
1200
000
250 kcmil
1600
0000
350 kcmil
2000
250 kcmil
400 kcmil
2500
350 kcmil
500 kcmil
3000
400 kcmil
600 kcmil
4000
500 kcmil
800 kcmil
5000
700 kcmil
1000 kcmil
6000
800 kcmil
1250 kcmil
1) The ampacity of the largest ungrounded conductor, or the equivalent if multiple
conductors are used, shall be determined from the appropriate Table in the Code, taking into
consideration the number of conductors in the raceway or cable and the type of insulation.
98
Table 18 – Minimum Size of Grounding Conductor
for Service Raceway and Service Equipment
(See Rule 10-812)
Size of Grounding Conductor
Ampacity of largest service
conductor or equivalent
for multi-conductors
not exceeeding – amperes
Copper
Wire
AWG
Metal Conduit or Pipe
Electrical
Metallic Tubing
(mm)
(in)
(mm)
60
8
21
3/4
27
(in)
1
100
8
27
1
35
1 1/4
200
6
35
1 1/4
41
1 1/2
400
3
63
2 1/2
63
2 1/2
600
1
78
3
103
4
800
0
103
4
103
4
Over 800
00
155
6
–
–
Table 21 – Supporting of Conductors in Vertical Runs
of Raceways (See Rule 12-120)
Maximum Distance – Metres
Conductor Size
AWG & kcmil
Copper
Aluminum
14 to 8
30
30
6 to 0
30
60
00 to 0000
24
55
250 to 350
18
40
Over 350 to 500
15
35
Over 500 to 750
12
30
Over 750
10
25
Contact General Cable toll-free at (800) 661-1451
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Note:
For installation of
armoured cables in
vertical raceways
please contact
General Cable for
assistance. See
the General Cable
Armoured Cable
Canadian Catalogue
for additional
information.
99
Tables
Dimensions of Stranded Aluminum Conductors
Conductor
Wires
Area
Size
AWG
Diameter
No.
Circ. Mils
mm2
sq. in.
mm
in.
8
16510
8.37
.01297
7(6)*
1.23
.0486
6
26240
13.30
.02061
7(6)*
1.55
.0612
4
41740
21.15
.03278
7(6)*
1.96
.0772
3
52620
26.66
.04133
7(6)*
2.30
.0867
2
66360
33.62
.05212
7(6)*
2.47
.0974
1
83690
42.41
.06573
19(7)*
1.69
.0664
0/1
105600
53.51
.08291
19(7)*
1.89
.0745
2/0
133100
67.44
.1045
19(11)*
2.13
.0837
3/0
167800
85.02
.1318
19(15)*
2.39
.0940
4/0
211600
107.22
.1662
19(17)*
2.68
.1055
250 kcmil
126.68
.1963
37(18)*
2.09
.0822
300
152.01
.2356
37(18)*
2.31
.0900
350
177.34
.2749
37(24)*
2.47
.0973
400
202.68
.3142
37(24)*
2.64
.1040
500
253.36
.3927
37(30)*
2.95
.1162
600
304.02
.4712
61(34)*
2.52
.0992
750
380.03
.5980
61(53)*
2.82
.1109
1000
506.70
.7854
61(53)*
3.25
.1280
1250
633.38
.9817
90
2.98
.1172
1500
760.05
1.178
90
3.26
.1284
1750
886.70
1.374
127
2.98
.1174
2000
1013.40
1.571
127
3.19
.1255
*Reduced minimum number of wires for compact strandings shown in parentheses.
100
Nominal Conductor Diameter
Class “B” Standard
Compressed Round
Compact Round
mm
in
mm
in
mm
in
3.71
.146
3.60
.142
3.40
.134
4.67
.184
4.53
.178
4.29
.169
5.89
.232
5.71
.225
5.41
.213
6.60
.260
6.40
.252
6.05
.238
7.42
.292
7.20
.283
6.81
.268
8.43
.332
8.18
.322
7.59
.299
9.47
.373
9.19
.362
8.53
.336
10.64
.418
10.32
.406
9.55
.376
11.94
.470
11.58
.456
10.7
.423
13.41
.528
13.00
.512
12.1
.475
14.60
.575
14.16
.558
13.2
.520
16.00
.630
15.52
.611
14.5
.570
17.30
.681
16.78
.661
15.6
.6161
18.49
.728
17.94
.706
16.7
.659
20.65
.813
20.03
.789
18.7
.736
22.68
.893
22.00
.866
20.7
.813
25.35
.998
24.59
.968
23.1
.908
29.26
1.152
23.38
1.117
26.9
1.060
32.47
1.289
31.76
1.250
—
—
35.86
1.412
34.78
1.370
—
—
38.76
1.526
37.60
1.479
—
—
41.45
1.632
40.21
1.583
—
—
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101
Tables
DC Resistance Values and Weights
of Stranded Copper and Aluminum Conductors
ASTM B800* /ASTM B801¹
ASTM B8¹
APPROXIMATE NET WEIGHT
mm2
Aluminum
Copper
AWG or kcmil
lbs/1000ft
kg/km
lbs/1000ft
kg/km
0.519
*20 AWG
–
–
3.154
4.694
0.519
*18
–
–
5.015
7.464
0.823
*16
–
–
7.974
11.868
2.08
*14
3.795
5.648
12.68
18.87
3.31
*12
6.03
8.974
20.16
30
5.26
*10
9.501
14.27
32.06
47.72
8.37
8
15.5
29.1
50.97
75.86
13.3
6
24.7
36.8
81.05
120.63
21.2
4
39.3
58.5
128.9
191.8
26.7
3
49.5
73.7
162.5
241.9
33.6
2
62.5
93
204.9
304.9
42.4
1
78.8
117
258.4
384.6
53.5
1/0
99.4
148
325.8
484.9
67.4
2/0
126
186
410.9
611.5
* Solid conductors
¹ Reference standard used
* Approximate weights and average DC resistances are considered to apply to all types
of strands. Conductor data and metric equivalents in these tables are based where
possible on CSA Standard 22.2 No. 38
102
CSA 22.2 no. 38¹
CSA 22.2 no.38¹
AVERAGE DC RESISTANCE¹ 20°C
Aluminum
Bare Copper
Ohms /km
Ohms /Kft
Ohms/km
Ohms /K
–
–
–
33.8
10.3
–
21.46
–
6.54
–
13.45
4.1
–
–
8.46
2.58
8.88
2.71
5.35
1.63
5.59
1.7
3.35
1.02
3.52
1.07
2.1
0.64
2.21
0.674
1.32
0.403
1.39
0.424
0.83
0.253
1.1
0.336
0.659
0.201
0.875
0.267
0.522
0.159
0.693
0.211
0.413
0.126
0.55
0.168
0.328
0.1
0.436
0.133
0.261
0.0795
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103
Tables
DC Resistance Values and Weights
of Stranded Copper and Aluminum Conductors (Continued)
ASTM B800* /ASTM B801¹
ASTM B8¹
APPROXIMATE NET WEIGHT
mm2
Aluminum
Copper
AWG or kcmil
lbs/100ft
kg/km
lbs/100ft
kg/km
85
3/0
158
235
518.1
771.1
107
4/0
199
296
653.1
972
127
250kcmil
235
350
771.9
1148.8
152
300
282
420
926.3
1378.6
177
350
329
490
1081
1609
203
400
376
559
1235
1838
253
500
471
701
1544
2298
304
600
565
841
1853
2758
380
750
706
1050
316
3447
456
900
847
1260
2779
4136
507
1000
941
1400
3088
4596
633
1250
1170
1750
3859
5743
760
1500
1410
2100
4631
6892
887
1750
1640
2440
5403
8041
1010
2000
1880
2790
6175
9190
* Solid conductors
¹ Reference standard used
* Approximate weights and average DC resistances are considered to apply to all types
of strands. Conductor data and metric equivalents in these tables are based where
possible on CSA Standard 22.2 No. 38
104
CSA 22.2 no. 38¹
CSA 22.2 no.38¹
AVERAGE DC RESISTANCE¹ 20°C
Aluminum
Ohms /km
Bare Copper
Ohms /Kft
Ohms/km
Ohms /K ft
0.346
0.106
0.207
0.063
0.274
0.0836
0.164
0.05
0.232
0.0708
0.139
0.0423
0.194
0.059
0.116
0.0353
0.166
0.0505
0.0991
0.0302
0.145
0.0442
0.0866
0.0264
0.116
0.0354
0.0695
0.0212
0.0967
0.0295
0.0578
0.0176
0.0774
0.0236
0.0462
0.0141
0.0645
0.0197
0.0387
0.0118
0.058
0.0177
0.0348
0.0106
0.0464
0.0142
0.0278
0.00846
0.0387
0.0118
0.0231
0.00705
0.0332
0.0101
0.0198
0.00604
0.029
0.00884
0.0174
0.00529
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105
Tables
Table D6 – Recommended* Tightening Torques
for Wire-binding Screws, Connectors with Slotted Screws,
and Connectors for External Drive Wrenches (See Table D7)
Type of connection
Wire size, AWG or kcmil
Tightening torque, N•m
Wire-binding screws
14-10
1.4
Connectors with
slotted screws (slot width —
1.2 mm or less and slot
length — 6.4 mm or less)
30-10
2.3
8
2.8
6-4
4.0
3
4.0
2
4.0
30–10
4
8
4.5
6–4
5.1
3
Connectors with slotted
screws (slot width over
1.2 mm and slot length
over 6.4 mm)
106
5.6
2
5.6
1
5.6
1/0–2/0
5.6
3/0–4/0
5.6
250–350
5.6
400
5.6
500
5.6
600–750
5.6
800–1000
5.6
Type of connection
Wire size, AWG or kcmil
Tightening torque, N•m
30–10
9
Connectors for hexagonal
head — External drive wrench
(split-bolt connectors)
8
9
6–4
18.6
3
31.1
2
31.1
1
31.1
1/0–2/0
43.5
3/0–4/0
56.5
250–350
73.4
400
93.2
500
93.2
600–750
113
800–1000
124.3
1250–2000
124.3
* For proper termination of conductors, it is very important that field connections
be properly tightened. In the absence of manufacturer’s instructions on the equipment,
the torque values given in Tables D6 and D7 are recommended.
Because it is normal for some relaxation to occur in service, checking torque values some
time after installation is not a reliable means of determining the values of torque applied
at installation.
Note: The values in this table are correlated for consistency with the harmonized
Standard CAN/CSA-C22.2 No. 65.
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107
Tables
Table D6 – Recommended* Tightening Torques for
Wire-binding Screws, Connectors with Slotted Screws,
and Connectors for External Drive Wrenches (Continued)
(See Table D7)
Type of connection
Connectors for hexagonal
head — External drive wrench
(other connectors)
Wire size, AWG or kcmil
Tightening torque, N•m
30–10
8.5
8
8.5
6–4
12.4
3
16.9
2
16.9
1
16.9
1/0–2/0
20.3
3/0–4/0
28.2
250–350
36.7
400
36.7
500
42.4
600–750
42.4
800–1000
56.5
1250–2000
67.8
*For proper termination of conductors, it is very important that field connections
be properly tightened. In the absence of manufacturer’s instructions on the equipment,
the torque values given in Tables D6 and D7 are recommended.
Because it is normal for some relaxation to occur in service, checking torque values some
time after installation is not a reliable means of determining the values of torque applied
at installation.
Note: The values in this table are correlated for consistency with the harmonized
Standard CAN/CSA-C22.2 No. 65.
108
Table D7 –
Recommended Tightening Torques
(See Table D6)
Usage
Connection type and size
Tightening torque, N•m
Socket (across flats) mm (inches)
Screws with recessed allen or
square drives
3.2
(1/8)
5.1
4
(5/32)
11.3
4.8
(3/16)
13.6
5.6
(7/32)
16.9
6.4
(1/4)
22.6
7.9
(5/16)
31.1
9.5
(3/8)
42.4
12.7
(1/2)
56.5
14.3
(9/16)
67.8
Screw or bolt metric (SAE)
No. 8 or smaller
2
No. 10
3
M6 (1/4)
8
5/16
15
M10 (3/8)
26
5/16
41
M12 (1/2)
54
9/16, 5/8, or larger
75
Connecting hardware
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109
Tables
Table D7 – Recommended* Tightening Torques (Continued)
(See Table D6)
Usage
Connection type and size
Tightening torque, N•m
“Slot width of screw less than 1.2
mm (3/64 inch) — Slot length
mm (inches)”
Slotted head screws smaller
than No. 10 intended for use
with No. 8 AWG or smaller
conductors
< 4 (< 5/32)
7
4 (5/32)
7
4.8 (3/16)
7
5.6 (7/32)
7
6.4 (1/4)
9
Slot width of screw 1.2 mm (3/64
inch) and larger — Slot length
mm (inches)
< 4 (< 5/32)
9
4 (5/32)
12
4.8 (3/16)
12
5.6 (7/32)
12
6.4 (1/4)
12
7.1 (9/32)
15
> 7.1 (> (9/32)
20
*For proper termination of conductors, it is very important that field connections
be properly tightened. In the absence of manufacturer’s instructions on the equipment,
the torque values given in Tables D6 and D7 are recommended.
Because it is normal for some relaxation to occur in service, checking torque values some
time after installation is not a reliable means of determining the values of torque applied
at installation.
Note: The values in this table are correlated for consistency with the harmonized
Standard CAN/CSA-C22.2 No. 65.
110
Closest AWG or kcmil Size(s) to Metric Conductor Size(s)
Metric conductor size, mm2
Closest AWG or kcmil size(s) for selection of
insulation and jacket thickness requirement
2.5
14
4
12
6
10
10
8
16
6
25
4
35
2
50
1/0
70
2/0
95
3/0
120
250
150
300
240
500
300
600
400
800
500
1000
630
1250
800
1500
1000
2000
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111
Basic Metric Conversion Factors
Convert
Into
circular mils
square mils
0.7854
cubic inches
litres
0.01639
feet
metres
0.3048
inches
centimetres
2.540
kcmil
square millimetres
0.5067
kilograms
pounds
2.205
kilograms per kilometre
pounds per foot
0.00067197
kilometres
miles
0.6214
kilometres
yards
1 094
metres
feet
3.281
metres
yards
1.094
millimeters
inches
0.03937
pounds
kilograms
0.4536
pounds per foot
kilograms per kilometre
1488.16
square inches
circular mils
1273.23
square inches
square millimetres
645.16
square millimetres
circular mils
1973.55
square millimetres
square inches
1.550 x 10-3
tons (long)
kilograms
1016
tons (long)
pounds
2240
tons (metric)
pounds
2205
tons (short)
kilograms
907.18
tons (short)
pounds
2000
Temperature
˚C = (˚F -32) x 5/9
˚F = (˚C x 9/5) + 32
112
Multiply By
Notes
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113
Notes
114
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115
Notes
116
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117
Notes
118
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119
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General Cable Technologies Corporation.
©2013. General Cable Technologies Corporation.
Highland Heights, KY 41076
All rights reserved.
Printed in USA
Phone: 1.800.243.8020
1.859.572.8000
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