Nominal Ac Mains Supply Voltage¾150 V Nominal Ac Mains Supply Voltage >150 V ¾300 V Additional Clearance (mm)
Pollution Degrees1 and 2 Pollution Degrees 3 Pollution Degrees 1, 2, and 3
Maximum Peak
Working Voltage (V)		 Maximum Peak
Working Voltage (V)		 Maximum Peak Working Voltage (V) Functional, Basic,
or Supplementary Insulation		 Reinforced
Insulation
210 (210)
298 (288)
386 (366)
474 (444)
562 (522)
65 (600)
738 (678)
828 (756)
914 (839)
1002 (912)
1090 (990)		 210 (210)
294 (293)
379 (376)
463 (459)
547 (541)
632 (624)
715 (707)
800 (790)

420 (420)
493 (497)
567 (575)
840 (852)
713 (729)
787 (807)
860 (884)
933 (961)
1006(1039)
1080 (1116)
1153 (1193)
1226 (1271)
1300 (1348)
-- (1425)

0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3

 0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6

Note: The value in parentheses shall be used when the values in parentheses in Table 2H are used in accordance with item 2 of Table 2H and for functional insulation.

Table II. Table 2J of the standard provides additional clearances for insulation in primary circuits with peak working voltages exceeding the peak value of the nominal ac mains supply voltage.