Subclass Peak Voltage ＞2.5kV ＜4.0kV ＜2.5kV ＜1.2kV X1 X2 X3 Y1 Type Insulation Double Y2 Basic Y3 Basic Y4 Basic Subclass IEC 664 Category Application III Hi-pulse II I General General Voltage Range ＜500V ＞150V ＜300V ＞150V ＜150V ＜250V Peak Voltage 8.0kV In addition, in North America, Designations of Acrossthe-Line capacitors, Antenna couplings, and Line bypass capacitors refer to the following applications： Class X： Across-the-line Class Y： Line bypass X cap Y cap CASE 2M UL1414 CSA 500M 500M None 2.5kV ENDURANCE TEST IEC60384-14 UL1283 15,000M X cap Y cap CASE 1500VAC UL1414 250V 1500VAC 1000VAC CSA IEC384-14 X2 Y IEC60384-14 LIGHTNING SURGE TEST WV×4.3（DC） 1000VAC UL1414 CSA 125V 250V TEST WV×1.5 220 440 220 WV×1.25 WV×1.7 VOLTAGE MAX 440 880 440 1000 1000 NONE VOLTAGE TEST 1000 1000 1000 1000 1000 1000 TIME HR 30,000M WITHSTAND VOLTAGE TEST （ONE MINUTE TEST） UL1283 250V 1000VAC Class Y： Antenna coupling 5.0kV SAFETY AGENCY TEST PARAMETERS INSULATION RESISTANCE TEST（OHMS） UL1283 NONE Class X： Across-the-line IEC60384-14II Test： 1.2μsec×50μsec wave form. Repetition： Three Times Voltage Peak： X1 cap - 4Kv, X2 cap - 2.5kV Y2 cap - 5kV 1500VAC Okaya characterizes all capacitors using the standard test procedures outlined in JIS C 5102, 5150, 5151. These test parameters are confirmed by a Q.A. audit and are published as guaranteed specifications shown as “dielectric withstanding voltage”. Okaya performs 100% screen testing of all capacitors during the production process. These tests are subject to changes due to improvements in test equipment and procedures and are published for reference only. 5 SUPPRESSION CAPACITORS OUTLINE OF CAPACITOR CLASS RATINGS Capacitor are classified by the IEC into two categories （these designations are used by most European countries）. Class Y： Capacitors used in applications where damage to the capacitor may involve danger of electrical shock. Class X： Capacitors used in applications where damage to the capacitor will not lead to the danger of electrical shock. These X and Y Classifications are further divided into subcategories as shown in the tables. （Ref. IEC60384-14, 2nd edition, 1993）