3714 Kinnear Place Saskatoon, SK Canada S7P 0A6 Ph: (306) 373-5505 Fx: (306) 374-2245 www.littelfuse.com/relayscontrols NGRM-ENC MANUAL ENCLOSED NEUTRAL-GROUNDING-RESISTOR MONITOR Revision 0-B-030515 NGRM-ENC CONTROL POWER PHASE A NGRM-ENC PHASE B PHASE C PHASE A PHASE B PHASE C LITTELFUSE STARTCO GROUND FAULT NEUTRAL-GROUNDING-RESISTOR MONITOR LEAKAGE CURRENT SE-330 LEAKAGE CURRENT RESISTOR FAULT GROUND FAULT DIAGNOSTIC TRIP TRIP CALIBRATED RESISTOR FAULT RELAY K1 8 6 10 20 40 60 80 POWER RESET 0.4 0.3 0.2 0.1 ON OFF 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL 4 100 2 MEM GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 (S5 CAL 2.0 3.0 5.0 10.0 GF TRIP TIME (s) 20 K Ω VN x 1 100 K Ω) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 PULSE PERIOD (s) ON OFF RESET PULSE ENABLE PULSE ENABLE USB Copyright © 2015 by Littelfuse Startco All rights reserved. Document Number: PM-1230-EN Printed in Canada. 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Page i Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor TABLE OF CONTENTS SECTION DISCLAIMER PAGE 1 General ................................................................. 1 1.1 SE-325 Models ..................................................... 1 1.2 SE-330 Models ..................................................... 1 2 Operation ............................................................. 1 2.1 Indication, Metering, and Reset ............................ 1 2.2 Configuration and Settings ................................... 1 3 Installation ........................................................... 2 3.1 Type 4X Enclosure ............................................... 2 3.2 Connections to the Neutral-Grounding-Resistor and Current Transformer....................................... 2 3.2.1 SE-325 Models .......................................... 2 3.2.2 SE-330 Models .......................................... 2 3.3 Supply Voltage Connection .................................. 2 3.3.1 Supply by Field Connection ...................... 2 3.3.2 Control Power Transformer (CPT) Models .................................................................. 2 3.4 Phase-Voltage Indication ...................................... 2 3.5 Relay-Output Connections .................................... 2 3.6 Network-Communications Connections ............... 2 3.7 Dielectric-Strength Testing ................................... 2 4 Technical Specifications ................................... 15 5 Ordering Information ....................................... 16 6 Warranty ........................................................... 16 Appendix A NGRM-ENC Revision History .............. 17 LIST OF FIGURES FIGURE 1 2 3 4 5 6 7 8 9 10 11 12 Page ii Rev. 0-B-030515 PAGE NGRM-ENC Outline and Mounting Details ......... 3 SE-325 Typical Wiring Diagram........................... 4 SE-330 Typical Wiring Diagram........................... 5 SE-325 Model (NGRM-ENC-100-01) Interior/Exterior Details .......................................... 6 SE-325 Model (NGRM-ENC-100-01) Interior Details ........................................................ 7 SE-325 Model (NGRM-ENC-XX0-XX) Wiring Label .......................................................... 8 SE-330 Surface-Mount Model (NGRM-ENC-XX0-21) Interior/Exterior Details .... 9 SE-330 Surface-Mount Model (NGRM-ENC-XX0-X1) Interior Details ............... 10 SE-330 Surface-Mount Model (NGRM-ENC-XX0-XX) Wiring Label................. 11 SE-330 Panel-Mount Model (NGRM-ENC-XX1-21) Interior/Exterior Details .. 12 SE-330 Panel-Mount Model (NGRM-ENC-XX1-X1) Interior Details ............... 13 SE-330 Panel-Mount Model (NGRM-ENC-XX1-XX) Wiring Label................. 14 Specifications are subject to change without notice. Littelfuse Startco is not liable for contingent or consequential damages, or for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction. NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor This page intentionally left blank. Page iii Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor 1. GENERAL The NGRM-ENC Enclosed Neutral-GroundingResistor (NGR) Monitor series is a Type 4X enclosure housing a Littelfuse Startco SE-325 or SE-330 NeutralGrounding-Resistor Monitor and optional accessories that include a 480/600-V control power transformer (CPT), faulted-phase indication (FPI; implemented with an EL3100 Ground-Fault & Phase-Voltage Indicator), earthleakage panel meter, pulse-enable control, and mounting options. Appropriate fusing is included and field wiring is to terminal blocks. This manual supplements the relevant NGR-monitor and EL3100 manuals. 1.1 SE-325 MODELS NGRM-ENC models with an SE-325 NGR Monitor include a surface-mounted NGR monitor, panel-mounted indication and reset and have a Type 4X rating. Options include a CPT and FPI. See Figs. 4 and 5. 1.2 SE-330 MODELS NGRM-ENC models with an SE-330 NGR Monitor include a panel- or surface-mounted NGR monitor which can be optionally equipped with a network-communications interface. Panel-mounted models include an SE-IP65CVR-G Hinged Transparent Cover and have an IP65 rating. Surface-mounted models include panelmounted indication and reset, USB connector, and have a Type 4X rating. Both mounting styles can optionally be equipped with a CPT, FPI, earth-leakage panel meter, and pulse-enable switch. See Figs. 7 and 10. 2. OPERATION Refer to the SE-325, SE-330, and EL3100 manuals included with the NGRM-ENC or at www.littelfuse.com/ relayscontrols, as required. NOTE: For models equipped with an SE-330 NGR Monitor and an optional pulse-enable switch, select Pulse Enable to cause the SE-330 K1 contact to cycle at a rate determined by the SE-330 front-panel Pulse Period switch. Ensure that SE-330 configuration switch S1 is set to K1=Pulse. CAUTION: For models equipped with a CPT and/or FPI, the maximum supply voltage is 600 Vac. Page 1 Rev. 0-B-030515 2.1 INDICATION, METERING, AND RESET Surface-mount models include red panel-mounted Ground Fault and Resistor Fault LED’s that indicate the NGR-monitor trip state, and a green Control Power LED. Reset latched trips by pressing the Reset button when the trip condition is no longer present. NGR-monitor frontpanel indication and reset is accessible when the door panel is open. Panel-mounted SE-330 face-plate indication is visible through the hinged transparent cover. Open the hinged transparent cover to access the SE-330 Reset button. Models equipped with earth-leakage metering continuously display earth-leakage current as a percentage of the ground-fault-CT-primary rating when the SE-330 is energized. All SE-330 models have a USB interface through which NGR-resistance-change, neutral-voltage and current metering is accessible with a PC running SE-MON330 software that is available at Littelfuse.com. This data is also accessible through the optional networkcommunications interface. 2.2 CONFIGURATION AND SETTINGS Factory configuration is per the SE-325 or SE-330 manual, except that SE-330 models equipped with a pulseenable switch have configuration switch S1 set to K1=Pulse. Adjust settings as required – refer to the appropriate manuals. NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor 3. INSTALLATION 3.1 TYPE 4X ENCLOSURE The 455 x 340 x 175 mm polyester enclosure has a hinged front panel with dual lockable latches. For wall mounting, attach the included mounting brackets to the back of the enclosure with the enclosed fasteners, and prepare the mounting surface using the dimensions as shown in Fig. 1. All models ship with no predrilled cable entry. An appropriate hole or holes must be made in the enclosure for the installation of all conductors. Space is allowed at the bottom for cable entry. See Figs. 4, 7, and 10. Use appropriate cable-entry fittings. 3.2 CONNECTIONS TO THE NEUTRAL-GROUNDINGRESISTOR AND CURRENT TRANSFORMER For all models, connect NGRM-ENC terminal R to an ER-series sensing resistor(1) terminal R. Follow SE-325 or SE-330 manual guidelines for wire size selection. See Figs. 2 and 3. All models connect to a current The transformer(1), which measures NGR current. sensing resistor and CT are typically located in the NGR enclosure. 3.2.1 SE-325 MODELS Connect the CT200 current transformer(1) secondary to NGRM-ENC terminals CT1 and CT2. Connections are not polarity sensitive. Follow SE-325 manual guidelines for wire size selection. See Fig. 2. 3.2.2 SE-330 MODELS For sensitive EFCT- or SE-CS30-series current sensors(1), connect to NGRM-ENC terminals S and C. For 5-A-secondary CT’s connect to terminals 5 and C. A field-wiring change is required for 1-A-secondary CT connections. See Fig. 3. CT connections are not polarity sensitive. Follow SE-330 manual guidelines for wire size selection. 3.3 SUPPLY VOLTAGE CONNECTION Appropriate supply-voltage fusing is provided for all models. Connect terminal GND to system ground. 3.3.1 SUPPLY BY FIELD CONNECTION For models requiring field-supply-voltage connections, connect line and neutral to NGRM-ENC terminals L and N. See Figs. 2 and 3. SE-325 and SE-330 models require a 120-Vac supply. Consult the appropriate product manual for power requirements. Page 2 Rev. 0-B-030515 3.3.2 CONTROL POWER TRANSFORMER (CPT) MODELS Models equipped with a CPT are compatible with 480- and 600-V systems, and are factory-connected for a 600-V system. Field adjustment for a 480-V system is required by moving the T1H3 connection on T1 to the H2 terminal of T1. Connect NGRM-ENC terminals ØA and ØB to the 480- or 600-V bus using 14 to 6 AWG (2.08 to 13.3 mm2) wire. See Figs. 2 and 3. 3.4 PHASE-VOLTAGE INDICATION For models equipped with phase-voltage and faultedphase indication, connect NGRM-ENC terminals ØA, ØB, and ØC to the 480- or 600-V bus using 14 to 6 AWG (2.08 to 13.3 mm2). See Figs. 2 and 3. These terminals are shared by the CPT connections for models so equipped. 3.5 RELAY-OUTPUT CONNECTIONS For external alarm or trip indication and protection, connect to SE-325 A-B relay output or SE-330 K1 relay output by connecting to NGRM-ENC terminals 301 and 302. A field-wiring change is required if a supply-voltage connection is required to the relay output(s) within the NGRM-ENC. Field wiring is required if connection to SE-330 relay outputs K2, K3, and K4 is required. See Figs. 2 and 3 and the appropriate product manual. NOTE: The SE-330 surface-mount options use relays K2 and K3 for panel-mounted ground-fault and resistor-fault indication respectively. 3.6 NETWORK-COMMUNICATIONS CONNECTIONS For SE-330 models equipped with a communications option, connect directly to the SE-330 network interface, referring to the appropriate product manual. 3.7 DIELECTRIC-STRENGTH TESTING Remove the connections at the SE-325 and SE-330 L1 and L2 terminals, and remove the connection to the EL3100 terminal 19 (if installed), before performing dielectric-strength testing. Ensure that all connections are reconnected and securely fastened after any tests. See Figs. 2 and 3. NOTES: (1) Not included with the NGRM-ENC. Page 3 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor NGRM-ENC PHASE A PHASE B PHASE C LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR MONITOR SE-330 LEAKAGE CURRENT RESISTOR FAULT GROUND FAULT DIAGNOSTIC TRIP TRIP CALIBRATED RELAY K1 8 6 10 20 40 60 80 POWER 453.8 (17.87) 100 2 MEM GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL 4 (S5 CAL GF TRIP TIME (s) 20 K Ω VN x 1 100 K Ω) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 ON OFF PULSE PERIOD (s) RESET PULSE ENABLE 264.0 406.2 (10.40) (16.00) SIDE FRONT NOTES: 1. DIMENSIONS IN MILLIMETRES (INCHES). 436.6 (17.19) 2. PANEL-MOUNTED SE-330 MODEL SHOWN. 330.5 (13.00) REAR (MOUNTING DETAIL) FIGURE 1. NGRM-ENC Outline and Mounting Details. Page 4 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor OPTIONAL INCOMING 120V BY CUSTOMER L N OPTIONAL INCOMING 480V/600V BY CUSTOMER ØA ØB ØC *F2 0.5 A *F3 0.5 A *F4 0.5 A 1 3 T1H3 T1H2 T1H1 5 600V H1 480V H2 19 H3 AH BH DB CH DA G *T1 600/480 120/240 150 VA X1 120V X2 DN 10 401 11 402 12 403 15 404 *PHASE C DS4 GRN DS3 *PHASE B GRN DS2 *PHASE A GRN *EL3100 X4 T1X2 T1X1 X3 120V DC F1 0.8 A N GND X1 L X2 GRN LT1 CONTROL POWER 301 302 CT2 CT1 WHT CT2 BLK CT1 SHLD CT1 CT2 SE-325 FACTORY SETTINGS GF TRIP TIME: 0.1 SEC GF TRIP LEVEL: 0.5 A MODE: UV RESISTOR: 20K RESISTOR TRIP LEVEL: 20 ADJUST AS REQUIRED. A B L1 L2 K1 SE-325 R G R RI 304 + 305 GI 303 306 SW LT3 RESISTOR FAULT R X1 NOTES: 1. RELAY CONTACTS SHOWN WITH SE-325 DE-ENERGIZED. 2. DESIGNATORS WITH LEADING “*” ARE OPTIONAL. FIGURE 2. SE-325 Typical Wiring Diagram. PB1 RESET X2 RED LT2 GROUND FAULT X1 RED X2 Page 5 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor OPTIONAL INCOMING 120V BY CUSTOMER L N OPTIONAL INCOMING 480V/600V BY CUSTOMER ØA ØB *F2 0.5 A ØC *F3 0.5 A *F4 0.5 A 1 3 T1H2 T1H3 T1H1 H1 600V 480V H2 5 H3 AH DC BH DB 120V 120V X2 403 *PHASE B GRN DS2 404 *PHASE A GRN N X1 5 WHT S BLK C 8 9 S 6 BLK RED SHLD X2 GRN RED C DS3 LT1 NOTE 1 CONTROL POWER WHT S DS4 *EL3100 L 5 402 GRN X4 F1 0.8 A GND 15 *PHASE C 401 T1X2 T1X1 X3 12 DN G *T1 600/480 120/240 150 VA X1 11 DA CH 19 10 5 C 1 10 11 R R 7 G 1 301 SE-330 FACTORY SETTINGS GF TRIP TIME: 0.5 SEC GF TRIP LEVEL: 20% VN TRIP LEVEL: 60 V ADJUST AS REQUIRED. K2 MODE: NON-FAIL-SAFE K3 MODE: NON-FAIL-SAFE L1 L2/N K1 22 K2 26 GF NOTE 1 X2 RED LT3 RESISTOR FAULT 304 X1 NOTE 1 X2 RED 13 18 PB1 RESET + 305 15 REMOTE RESET 306 16 RESET PULSE ENABLE 307 17 PULSE ENABLE - 3 5 0V 19 20 308 21 309 + DS1 IDC EARTH-LEAKAGE CURRENT (OPTIONAL) NOTES: 4 SPG 1. SURFACE-MOUNT MODELS ONLY. SPGA 2. RELAY CONTACTS SHOWN WITH SE-330 DE-ENERGIZED. SE-330 FIGURE 3. SE-330 Typical Wiring Diagram. X1 +24V NC (OPTIONAL) 303 LT2 GROUND FAULT 28 K4 14 NOTE 1 24 27 RF 12 302 25 K3 29 2 23 3. DESIGNATORS WITH LEADING “*” ARE OPTIONAL. Page 6 Rev. 0-B-030515 F2, F3, F4 SHLD BLK WHT GND BLOCK TB1 301 302 L N F1 CT1 CT2 A B L1 L2 RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 FUSE TB1 TB1 CTM NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor PB1 RESET 305 306 SE-325(SW) *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 DOOR WIRING (REAR VIEW) GND BLOCK OPTIONAL INCOMING 120 VAC BY CUSTOMER 16 17 18 19 L L L N N F1 - 0.8 A *T1X2 *T1X1 ØA OPTIONAL INCOMING 480 / 600 V BY CUSTOMER SE-325 TRIP NGR NOTES: 1.T1 IS SET FOR 600V INCOMING. FOR 480V ENCLOSURE INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. 2.DESIGNATORS WITH LEADING “*” ARE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. ØB ØC *F2 - 0.5 A *F3 - 0.5 A 9 8 7 6 5 4 3 2 1 400 RES TRIP LEVEL (VAC) POWER SE-325 SW GI *F2 RI NGR MONITOR R G 9 8 C B 208/240 BL CL 7 A AL 6 5 4 3 2 200 20 G F MODE RES 4.0 A SH 2.0 A 0.5 A UV 20K *F4 *F3 DISPLAY 15 14 13 12 11 10 RE SI STO R FAULT 16 2.0 GF TRIP TIME (s) CH RESET 1.0 0.1 1 SE-325(RI) RED SE-325(+) GROUND FAULT 480/600 BH *NOTE 1 F3 AH X2 304 17 F3 SE-325(CT1) SE-325(G) *EL3100(19) *T1X2 SE-325(GND) TB1 X1 DN DR DG DA DB DC F2 18 T1H2 T1H3 SE-325(GI) L2 SH T1H1 GND BLOCK X2 303 LT3 RESISTOR FAULT L1 G LT2 GROUND FAULT RED B 19 *T1 150 VA T1X1 TB1 GRN X1 A FAULT R G GND 5W GI + RI F1 L CT1 CT2 EL3100 SERIES X1 X2 GND BLOCK PB1 GND BLOCK TB1 T1X2 LT1 CONTROL POWER TB1 N F1 306 LT2 303 305 LT3 304 TB1 R GND BLOCK *DS4 *DS2 *DS3 401 403 402 *EL3100(10) *EL3100(11) *EL3100(12) *EL3100(15) GROUND-FAULT & PHASE-VOLTAGE INDICATOR SE-325 404 LT1(X1) SE-325(L1) SE-325(L2) LT1(X2) *EL3100(1) *T1H1 *T1H3 *EL3100(3) *F4 - 0.5 A GND GRN GND GND 301 302 WHT CT2 CT1 BLK SHLD R *EL3100(5) L(F1) 0.8 A 600V GND BLOCK CTM SE-325(A) SE-325(B) SE-325(CT2) SE-325(CT1) ØA(F2) 0.5 A 600V SE-325(R) TB1 ØB(F3) 0.5 A 600V ØC(F4) 0.5 A 600V GND GND GND 301 302 CT2 CT1 SHLD R T1 150 VA INTERIOR NGRM-ENC CONTROL POWER PHASE A GROUND FAULT RESISTOR FAULT RESET SIDE FRONT NOTE: 1. SHOWN WITH ALL OPTIONS AVAILABLE. FIGURE 4. SE-325 Model (NGRM-ENC-100-01) Interior/Exterior Details. PHASE B PHASE C 18 SH RES TRIP LEVEL (VAC) POWER SE-325 SW GI RI NGR MONITOR R G L(F1) 0.8 A 600V ØA(F2) 0.5 A 600V ØB(F3) 0.5 A 600V ØC(F4) 0.5 A 600V GND GND GND 301 302 CT2 CT1 SHLD R T1 150 VA FIGURE 5. SE-325 Model (NGRM-ENC-100-01) Interior Details. 8 9 208/240 BL CL 7 B A AL 6 5 CH 4 3 480/600 BH 2 16 400 17 20 G F MODE RES 4.0 A SH 2.0 A 0.5 A UV 20K G 2.0 GF TRIP TIME (s) 19 0.1 1 200 AH RE SI STO R FAULT 1.0 GROUND-FAULT & PHASE-VOLTAGE INDICATOR RESET L2 DISPLAY L1 15 14 13 12 11 10 B EL3100 SERIES GROUND FAULT A DN DR DG DA DB DC CT1 CT2 FAULT F1 C NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Page 7 Rev. 0-B-030515 F2, F3, F4 WHT GND BLOCK TB1 301 302 L N SHLD BLK RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 F1 CT1 CT2 A B L1 L2 FUSE TB1 TB1 CTM NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor *EL3100(10) GND BLOCK TB1 T1X2 LT1 CONTROL POWER TB1 N 306 LT2 303 PB1 305 LT3 304 R TB1 GND BLOCK *DS4 5W GI + RI *EL3100(15) 401 402 *EL3100(11) *EL3100(12) 403 *DS2 *DS3 404 X1 X2 F1 L R G GND SE-325 *T1 150 VA T1X1 GND BLOCK T1H1 T1H2 T1H3 TB1 F2 F3 *NOTE 1 F3 GRN LT2 GROUND FAULT X2 303 X1 SE-325(CT1) SE-325(G) *EL3100(19) *T1X2 SE-325(GND) TB1 GND BLOCK SE-325(GI) RED LT3 RESISTOR FAULT X1 X2 304 SE-325(RI) RED PB1 RESET SE-325(+) 305 306 SE-325(SW) *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 DOOR WIRING (REAR VIEW) GND BLOCK OPTIONAL INCOMING 120 VAC BY CUSTOMER 16 17 18 19 L L L N N F1 - 0.8 A *T1X2 *T1X1 ØA OPTIONAL INCOMING 480 / 600 V BY CUSTOMER SE-325 TRIP NGR NOTES: 1.T1 IS SET FOR 600V INCOMING. FOR 480V ENCLOSURE INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. 2.DESIGNATORS WITH LEADING “*” ARE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. ØB ØC *F2 - 0.5 A *F3 - 0.5 A 9 8 7 6 5 4 3 2 1 FIGURE 6. SE-325 Model (NGRM-ENC-XX0-XX) Wiring Label. *F3 *F2 LT1(X1) SE-325(L1) SE-325(L2) LT1(X2) *EL3100(1) *T1H1 *T1H3 *EL3100(3) *F4 - 0.5 A GND GRN GND GND 301 302 WHT CT2 CT1 BLK SHLD R TB1 *F4 *EL3100(5) GND BLOCK CTM SE-325(A) SE-325(B) SE-325(CT2) SE-325(CT1) SE-325(R) Page 8 Rev. 0-B-030515 Page 9 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor LT1 CONTROL POWER *DS4 *EL3100(15) X1 X2 TB1 N L 401 GRN TB1 LT2 GROUND FAULT *EL3100(10) *EL3100(11) *EL3100(12) 403 402 *DS2 *DS3 404 SE-330(20) X2 N *DS1 - 309 308 + Idc X1 303 RED SE-330(24) LT3 RESISTOR FAULT SE-330(21) X2 X1 304 SE-330(27) RED PB1 RESET *S1 PULSE SE-330(17) 307 SE-330(15) 306 305 SE-330(16) *EL3100(19) *T1X2 TB1 SE-330(11) SE-330(7) SE-330(3) OPTIONAL INCOMING 120 VAC BY CUSTOMER *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 GND BLOCK LT1(X1) SE-330(1) *T1X2 *T1X1 OPTIONAL INCOMING 480 / 600 V BY CUSTOMER NOTES: SE-330 1.T1 IS SET FOR 600V INCOMING. FOR 480V TRIP INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. NGR 2.DESIGNATORS WITH LEADING “*” ARE ENCLOSURE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. 16 17 18 19 9 8 7 6 5 4 3 2 1 8 6 *F4 *F3 *F2 SE-330(29) L L SE-330(26) L SE-330(2) N LT1(X2) N F1 - 0.8 A ØA *F2 - 0.5 A *T1H1 *EL3100(1) *EL3100(3) ØB *F3 - 0.5 A *T1H3 ØC *EL3100(5) *F4 - 0.5 A GND GRN GND GND BLOCK GND SE-330(22) 301 302 RED SE-330(23) 5 SE-330(10) WHT S SE-330(8) BLK C SE-330(11) CTM SHLD R SE-330(6) 10 20 40 60 80 4 100 2 MEM GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 POWER 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL (S5 CAL GF TRIP TIME (s) 20 K Ω VN x 1 9 8 C B 208/240 BL CL 7 A AL 6 5 CH 4 3 2 16 RELAY K1 *NOTE 1 F3 1 DISPLAY 15 14 13 12 11 10 DN DR DG DA DB DC TRIP CALIBRATED 17 F3 FAULT DIAGNOSTIC TRIP TB1 F2 AH T1H2 18 T1H1 SH *T1 150 VA T1X1 T1H3 GND BLOCK SE-330 RESISTOR FAULT GROUND FAULT CTM WHT 8 9 RED 10 BLK 11 SHLD GRN GND BLOCK GND BLOCK TB2 T1X2 F1 NEUTRAL-GROUNDING-RESISTOR MONITOR TB1 480/600 BH R 6 GND GND BLOCK 7 LT2 303 24 25 L TB1 26 LT3 304 27 L 28 TB1 29 G F2, F3, F4 LITTELFUSE STARTCO 19 F1 RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 TB1 SE-330 301 22 302 23 TB1 FUSE L 1 2 N 3 GND GND BLOCK 4 5 EL3100 SERIES 12 13 14 305 15 PB1 306 16 *S1 307 17 18 19 *DS1(+) 308 20 309 *DS1(-) 21 GROUND-FAULT & PHASE-VOLTAGE INDICATOR DOOR WIRING (REAR VIEW) 100 K Ω) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 PULSE PERIOD (s) RESET L(F1) 0.8 A 600V ØA(F2) 0.5 A 600V ØB(F3) 0.5 A 600V TB1 ØC(F4) 0.5 A 600V T1 150 VA GND GND GND 301 302 5 S C SHLD R INTERIOR NGRM-ENC CONTROL POWER PHASE A GROUND FAULT PHASE B PHASE C LEAKAGE CURRENT RESISTOR FAULT RESET ON OFF PULSE ENABLE USB SIDE FRONT NOTE: 1. SHOWN WITH ALL OPTIONS AVAILABLE. FIGURE 7. SE-330 Surface-Mount Model (NGRM-ENC-XX0-21) Interior/Exterior Details. 60 80 POWER 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL 4 100 2 MEM GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 170 130 100 18 40 G 10 19 8 6 SH (S5 CAL GF TRIP TIME (s) 20 K Ω VN x 1 100 K Ω) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 PULSE PERIOD (s) L(F1) 0.8 A 600V RESET ØA(F2) 0.5 A 600V ØB(F3) 0.5 A 600V ØC(F4) 0.5 A 600V T1 150 VA GND GND GND 301 302 5 S C SHLD R FIGURE 8. SE-330 Surface-Mount Model (NGRM-ENC-XX0-X1) Interior Details. 8 9 208/240 BL CL 7 B A AL 6 5 CH 4 3 480/600 BH 2 RELAY K1 20 1 17 16 CALIBRATED AH TRIP GROUND-FAULT & PHASE-VOLTAGE INDICATOR DIAGNOSTIC TRIP EL3100 SERIES RESISTOR FAULT GROUND FAULT DISPLAY 15 14 13 12 11 10 SE-330 FAULT NEUTRAL-GROUNDING-RESISTOR MONITOR DN DR DG DA DB DC LITTELFUSE STARTCO C NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Page 10 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor LT1 CONTROL POWER *DS4 *EL3100(15) SE-330(20) X1 X2 TB1 N L 401 GRN TB1 LT2 GROUND FAULT *EL3100(10) *EL3100(11) *EL3100(12) 403 402 *DS2 *DS3 404 X2 N *DS1 - 309 308 + Idc X1 303 RED SE-330(24) LT3 RESISTOR FAULT SE-330(21) X2 X1 304 SE-330(27) RED PB1 RESET *S1 PULSE SE-330(17) 307 SE-330(15) 306 305 SE-330(16) DOOR WIRING (REAR VIEW) 305 PB1 306 *S1 307 *DS1(+) 308 309 *DS1(-) F1 F2, F3, F4 RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 L 1 2 N 3 GND GND BLOCK 4 5 R 6 GND GND BLOCK 7 LT2 303 24 25 L TB1 26 LT3 304 27 L 28 TB1 29 *T1 150 VA T1X1 T1H1 T1H2 T1H3 *EL3100(19) *T1X2 TB1 SE-330(11) SE-330(7) SE-330(3) GND BLOCK OPTIONAL INCOMING 120 VAC BY CUSTOMER TB1 CTM WHT 8 9 RED 10 BLK 11 SHLD GRN GND BLOCK GND BLOCK TB2 T1X2 F1 TB1 SE-330 301 22 302 23 TB1 FUSE 12 13 14 15 16 17 18 19 20 21 *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 GND BLOCK LT1(X1) SE-330(1) *T1X2 *T1X1 OPTIONAL INCOMING 480 / 600 V BY CUSTOMER NOTES: SE-330 1.T1 IS SET FOR 600V INCOMING. FOR 480V TRIP INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. NGR 2.DESIGNATORS WITH LEADING “*” ARE ENCLOSURE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. 16 17 18 19 L L L N N F1 - 0.8 A TB1 F2 F3 *NOTE 1 F3 9 8 7 6 5 4 3 2 1 *F4 *F3 *F2 SE-330(29) SE-330(26) SE-330(2) LT1(X2) ØA *F2 - 0.5 A *T1H1 *EL3100(1) *EL3100(3) ØB *F3 - 0.5 A *T1H3 ØC *EL3100(5) *F4 - 0.5 A GND GRN GND GND BLOCK GND SE-330(22) 301 302 RED SE-330(23) 5 SE-330(10) WHT S SE-330(8) BLK C SE-330(11) CTM SHLD R SE-330(6) TB1 FIGURE 9. SE-330 Surface-Mount Model (NGRM-ENC-XX0-XX) Wiring Label. Page 11 Rev. 0-B-030515 Page 12 Rev. 0-B-030515 SE-330(21) SE-330(16) GND BLOCK 16 17 18 19 L L L N N F1 - 0.8 A SE-330(1) OPTIONAL INCOMING 120 VAC BY CUSTOMER *T1X2 *T1X1 ØA OPTIONAL INCOMING 480 / 600 V BY CUSTOMER NOTES: 1.T1 IS SET FOR 600V INCOMING. FOR 480V INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. 2.DESIGNATORS WITH LEADING “*” ARE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. SE-330 TRIP NGR ENCLOSURE ØB ØC *F2 - 0.5 A *F3 - 0.5 A 9 8 C 208/240 BL CL 7 AL 6 5 *F4 *F3 *F2 L(F1) 0.8 A 600V SE-330(2) *EL3100(1) *T1H1 *T1H3 *EL3100(3) *F4 - 0.5 A GND GRN GND GND 301 302 RED 5 WHT S BLK C SHLD R CH B G 19 9 8 7 6 5 4 3 2 1 4 A 18 SH *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 DOOR WIRING (REAR VIEW) 3 DISPLAY 17 306 *EL3100(19) *T1X2 TB1 SE-330(11) SE-330(7) SE-330(3) *DS1 - 309 308 + Idc *S1 PULSE 307 2 *NOTE 1 GND BLOCK 1 F3 F3 *DS4 *DS3 *DS2 F2 401 402 403 T1H2 T1H3 *EL3100(10) *EL3100(11) *EL3100(12) SE-330(20) SE-330(17) T1H1 *T1 150 VA T1X1 *EL3100(15) AH F1 15 14 13 12 11 10 WHT 8 RED 9 BLK 10 SHLD 11 GND BLOCK GRN GND BLOCK TB2 T1X2 404 TB1 24 25 26 27 28 29 CTM TB1 DN DR DG DA DB DC 301 22 302 23 R 6 GND BLOCK GND 7 TB1 12 13 14 15 306 16 17 307 *S1 18 19 308 *DS1(+) 20 309 *DS1(-) 21 FAULT SE-330 16 F2, F3, F4 480/600 BH RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 F1 EL3100 SERIES L 1 N 2 GND BLOCK GND 3 4 5 TB1 FUSE GROUND-FAULT & PHASE-VOLTAGE INDICATOR NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor ØA(F2) 0.5 A 600V *EL3100(5) GND BLOCK CTM SE-330(22) SE-330(23) SE-330(10) SE-330(8) SE-330(11) ØB(F3) 0.5 A 600V SE-330(6) ØC(F4) 0.5 A 600V TB1 GND GND GND 301 302 5 S C SHLD R T1 150 VA INTERIOR NGRM-ENC PHASE A PHASE B PHASE C LITTELFUSE STARTCO NEUTRAL-GROUNDING-RESISTOR MONITOR SE-330 LEAKAGE CURRENT RESISTOR FAULT GROUND FAULT DIAGNOSTIC TRIP TRIP CALIBRATED RELAY K1 8 6 10 20 40 60 80 4 100 2 MEM GF TRIP LEVEL (% CT RATING) 0.5 0.7 1.0 0.4 0.3 0.2 0.1 2.0 3.0 5.0 10.0 POWER 170 130 100 200 340 800 1200 60 1700 20 2000 VN TRIP LEVEL (S5 CAL GF TRIP TIME (s) 20 K Ω VN x 1 100 K Ω) VN x 5 1.8 2.0 2.2 1.6 2.4 1.4 2.6 1.2 2.8 1.0 3.0 PULSE PERIOD (s) ON OFF RESET PULSE ENABLE SIDE FRONT NOTE: 1. SHOWN WITH ALL OPTIONS AVAILABLE. FIGURE 10. SE-330 Panel-Mount Model (NGRM-ENC-XX1-21) Interior/Exterior Details. 17 306 SE-330(21) SE-330(16) 18 *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 DOOR WIRING (REAR VIEW) GND BLOCK LT1(X1) SE-330(1) OPTIONAL INCOMING 120 VAC BY CUSTOMER 16 17 18 19 L L L N N F1 - 0.8 A *T1X2 *T1X1 ØA OPTIONAL INCOMING 480 / 600 V BY CUSTOMER NOTES: 1.T1 IS SET FOR 600V INCOMING. FOR 480V INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. 2.DESIGNATORS WITH LEADING “*” ARE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. G 19 *EL3100(19) *T1X2 TB1 SE-330(11) SE-330(7) SE-330(3) *DS1 - 309 308 + Idc *S1 PULSE 307 SH *EL3100(12) *EL3100(11) SE-330(20) GND BLOCK SE-330 TRIP NGR ENCLOSURE ØB ØC *F2 - 0.5 A *F3 - 0.5 A *F4 *F3 *F2 SE-330(2) *EL3100(1) *T1H1 *T1H3 *EL3100(3) *F4 - 0.5 A GND GRN GND GND 301 302 RED 5 WHT S BLK C SHLD R TB1 T1 150 VA 9 8 7 6 5 4 3 2 1 *EL3100(5) GND BLOCK CTM SE-330(22) SE-330(23) SE-330(10) SE-330(8) SE-330(11) SE-330(6) L(F1) 0.8 A 600V ØA(F2) 0.5 A 600V ØB(F3) 0.5 A 600V ØC(F4) 0.5 A 600V GND GND GND 301 302 5 S C SHLD R FIGURE 11. SE-330 Panel-Mount Model (NGRM-ENC-XX1-X1) Interior Details. 9 8 C B 208/240 BL CL 7 AL 6 5 CH 4 3 *NOTE 1 480/600 BH *DS3 F3 *EL3100(15) *DS2 *DS4 F2 F3 403 402 *EL3100(10) 401 T1H2 T1H3 404 SE-330(17) T1H1 *T1 150 VA T1X1 2 F1 1 GND BLOCK TB2 T1X2 AH WHT 8 RED 9 BLK 10 SHLD 11 GND BLOCK GRN TB1 TB1 24 25 26 27 28 29 CTM A 301 22 302 23 R 6 GND BLOCK GND 7 TB1 EL3100 SERIES SE-330 DISPLAY RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 FAULT F2, F3, F4 15 14 13 12 11 10 F1 16 FUSE 12 13 14 15 306 16 17 307 *S1 18 19 308 *DS1(+) 20 309 *DS1(-) 21 DN DR DG DA DB DC L 1 N 2 GND BLOCK GND 3 4 5 TB1 GROUND-FAULT & PHASE-VOLTAGE INDICATOR NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Page 13 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor L 1 N 2 GND BLOCK GND 3 4 5 TB1 FUSE RATING 0.8 A, 600 VAC LITTELFUSE KLDR.800TXP 0.5 A, 600 VAC LITTELFUSE KLK.500 F1 F2, F3, F4 SE-330 WHT 8 RED 9 BLK 10 SHLD 11 GND BLOCK GRN GND BLOCK TB2 T1X2 F1 TB1 F2 F3 *NOTE 1 F3 *EL3100(15) *DS2 *DS3 GND BLOCK *DS1 - 309 308 + Idc SE-330(21) *S1 PULSE 307 306 *EL3100(19) *T1X2 TB1 SE-330(11) SE-330(7) SE-330(3) SE-330(20) *EL3100(12) *EL3100(11) 403 402 *DS4 401 *EL3100(10) T1H2 T1H3 404 SE-330(17) T1H1 *T1 150 VA T1X1 308 *DS1(+) 309 *DS1(-) 24 25 26 27 28 29 CTM TB1 306 307 *S1 301 22 302 23 R 6 GND GND BLOCK 7 TB1 12 13 14 15 16 17 18 19 20 21 SE-330(16) *DS4 401 10 *DS3 402 11 403 12 *DS2 13 404 14 *EL3100 *DS2 15 DOOR WIRING (REAR VIEW) GND BLOCK LT1(X1) SE-330(1) OPTIONAL INCOMING 120 VAC BY CUSTOMER 16 17 18 19 L L L N N F1 - 0.8 A *T1X2 *T1X1 ØA OPTIONAL INCOMING 480 / 600 V BY CUSTOMER NOTES: 1.T1 IS SET FOR 600V INCOMING. FOR 480V INCOMING, MOVE F3-TO-T1 CONNECTION FROM T1H3 TO T1H2. 2.DESIGNATORS WITH LEADING “*” ARE OPTIONAL. 3.MINIMUM SUPPLY CONDUCTOR RATING 90ºC. 4.DASHED LINES INDICATE FIELD WIRING. SE-330 TRIP NGR ENCLOSURE ØB ØC *F2 - 0.5 A *F3 - 0.5 A 9 8 7 6 5 4 3 2 1 *F4 *F3 *F2 SE-330(2) *EL3100(1) *T1H1 *T1H3 *EL3100(3) *F4 - 0.5 A GND GRN GND GND 301 302 RED 5 WHT S BLK C SHLD R *EL3100(5) GND BLOCK CTM SE-330(22) SE-330(23) SE-330(10) SE-330(8) SE-330(11) SE-330(6) TB1 FIGURE 12. SE-330 Panel-Mount Model (NGRM-ENC-XX1-XX) Wiring Label. Page 14 Rev. 0-B-030515 Page 15 Rev. 0-B-030515 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor 4. TECHNICAL SPECIFICATIONS Supply: NGRM-ENC-000-00 ............12 VA, 120 Vac (+10, -45%), 60 Hz NGRM-ENC-100-00 EL3100 ...............................2 mA, 480/600 Vac, 60 Hz, 3-phase, 3-wire (no neutral) Monitor ...............................12 VA, 120 Vac (+10, -45%), 60 Hz NGRM-ENC-000-01, NGRM-ENC-100-01 ............14 VA, 480/600 Vac, 60 Hz, 3-phase, 3-wire (no neutral) NGRM-ENC-2XX-X0, NGRM-ENC-4XX-X0, NGRM-ENC-6XX-X0, NGRM-ENC-8XX-X0..........32 VA, 120 Vac (+10, -45%), 60 Hz NGRM-ENC-3XX-X0, NGRM-ENC-5XX-X0, NGRM-ENC-7XX-X0, NGRM-ENC-9XX-X0 EL3100 ...............................2 mA, 480/600 Vac, 60 Hz, 3-phase, 3-wire (no neutral) Monitor ...............................32 VA, 120 Vac (+10, -45%), 60 Hz NGRM-ENC-2XX-X1, NGRM-ENC-3XX-X1, NGRM-ENC-4XX-X1, NGRM-ENC-5XX-X1, NGRM-ENC-6XX-X1, NGRM-ENC-7XX-X1, NGRM-ENC-8XX-X1, NGRM-ENC-9XX-X1..........34 VA, 480/600 Vac, 60 Hz 3-phase, 3-wire (no neutral) Wiring Requirements: Terminals Blocks: Conductor Size................. 20 to 10 AWG (0.52 to 5.26 mm2) Fuseholders: Conductor Size................. 14 to 6 AWG (2.08 to 13.29 mm2) Fuse Requirements: F1: Fuse Rating ...................... 0.8 A, 600 Vac, Class CC Fuse Part Number ............ Littelfuse KLDR.800T or KLDR.800TXP (RoHS) F2 to F4 (see order options): Fuse Rating ...................... 0.5 A, 600 Vac, Fuse Part Number ............ Littelfuse KLK.500 Dimensions: Height ................................. 454 mm (17.9”) Width .................................. 406 mm (16.0”) Maximum Depth (with SE-IP65CVR-G installed) .. 264 mm (10.4”) Clearance required to open SE-IP65CVR-G .................. 112 mm (4.4”) Shipping Dimensions: NGRM-ENC-XXX-XX: Height .............................. 516 mm (20.3”) Width ............................... 465 mm (18.3”) Depth ............................... 309 mm (12.2”) Shipping Weight: NGRM-ENC-XXX-XX ........ 13.6 kg (30 lb) maximum Enclosure ................................. Polyester, Lockable Ratings: SE-325 Order Options ..... Type 4X SE-330 Surface-Mount Order Options .................. Type 4X SE-330 Panel-Mount Order Options .................. IP65 Environment: Operating Temperature ......... -40 to 60°C (-40 to 140°F) Storage Temperature ............. -55 to 80°C (-67 to 176°F) Humidity................................ 85% Non-Condensing Certification ................................. CSA, Canada and USA R C LR 53428 US To: CSA C22.2 No. 144 Ground Fault Circuit Interrupters CSA C22.2 No. 94 Special Purpose Enclosures UL 1053 Ground Fault Sensing and Relaying Equipment UL 50 Enclosures for Electrical Equipment NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Page 16 Rev. 0-B-030515 5. ORDERING INFORMATION 6. WARRANTY NGRM-ENC- The NGRM-ENC Enclosed Neutral-GroundingResistor Monitor is warranted to be free from defects in material and workmanship for a period of one year from the date of purchase. Littelfuse Startco will (at Littelfuse Startco’s option) repair, replace, or refund the original purchase price of an NGRM-ENC that is determined by Littelfuse Startco to be defective if it is returned to the factory, freight prepaid, within the warranty period. This warranty does not apply to repairs required as a result of misuse, negligence, an accident, improper installation, tampering, or insufficient care. Littelfuse Startco does not warrant products repaired or modified by non-Littelfuse Startco personnel. - Control-Power Transformer Option 0 No CPT 1 480/600-V CPT(1) Ammeter & Pulse Control Option 0 No ammeter 1 Earth-leakage panel meter(2) 2 Earth-leakage panel meter & pulse-enable switch(3) NGR Monitor Mounting Option 0 Surface-mounted NGR monitor(4) 1 Panel-mounted NGR monitor(5) Network Communications Option 0 No network communications 1 DeviceNet(2) 3 Ethernet, dual RJ45(2) 4 Ethernet, 1 RJ45 & 1 fiber(2) 5 Ethernet, dual fiber(2) 6 IEC 61850, dual RJ45(2) 7 IEC 61850, 1 RJ45 & 1 fiber(2) 8 IEC 61850, dual fiber(2) Protection Relay Option 0 SE-325 1 SE-325 & voltage indication(1) 2 SE-330 (N.O. K4) 3 SE-330 (N.O. K4) & voltage indication(1) 4 SE-330 (N.C. K4) 5 SE-330 (N.C. K4) & voltage indication(1) 6 SE-330HV (N.O. K4) 7 SE-330HV (N.O. K4) & voltage indication(1) 8 SE-330HV (N.C. K4) 9 SE-330HV (N.C. K4) & voltage indication(1) NOTES: Includes fuses. (2) SE-330 models only. (3) SE-330 models only, excluding SE-330HV models. (4) Includes panel-mounted indication & reset, and USB connector for SE-330 models. (5) SE-330 models only; includes IP65 hinged transparent cover. (1) NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor MANUAL RELEASE DATE APPENDIX A NGRM-ENC REVISION HISTORY MANUAL PRODUCT REVISION REVISION (REVISION NUMBER ON PRODUCT LABEL) March 5, 2015 0-B-030515 April 25, 2014 0-A-042514 MANUAL REVISION HISTORY REVISION 0-B-030515 SECTION 1 Added enclosure ratings. SECTION 3 Updated Figs. 2, 3, 7, 11, and 12. SECTION 4 Added enclosure ratings and CSA certification. APPENDIX A Updated revision history. REVISION 0-A-042514 Initial release. PRODUCT REVISION HISTORY REVISION 00 Initial release. Page 17 Rev. 0-B-030515 00 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor This page intentionally left blank. Page 18 Rev. 0-B-030515