Page 599 - Wago_PCB_TerminalBlocksConnectors_Volume2_2015_US

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• Insulation Parameters per IEC/EN 60664-1 (continued)

Table F.3b: Single-Phase, 4- or 3-Wire AC Systems

Voltages for Table F.4

Nominal voltage of the For insulation For insulation
supply system (mains) * line-to-line 1) line-to-ground 1)
All systems Three-phase 4-wire sys- Three-phase 3-wire sys-
tems tems
1)
neutral grounded 2) non-grounded or cor-
ner grounded

V V V V
60 63 32 63
110
120 125 80 125
127
150 ** 160 160
200 200 200
208 200 125 200
220
230 250 160 250
240
300 ** 320 320
380
400 250
415 400 400
440 500 250 500
480
500 500 320 500
575 630 400 630
** 630 630
600
660
690 630 400 630
720
830 800 500 800
960 1000 630 1000
1000 ** 1000 1000
1) Line-to-earth insulation level for non-grounded or impedance-grounded systems equals that for line-to-line, as the
operating voltage to ground of any line can, in practice, approach full line-to-line voltage. This is because the
actual voltage to ground is determined by the insulation resistance and capacitive reactance of each line to
ground; thus, low (but acceptable) insulation resistance of one line can in effect ground it and raise the other two
to full line-to-line voltage to ground.
2) For equipment used on both three-phase 4-wire and three-phase 3-wire systems, grounded and non-grounded,
use only the values for 3-wire systems.
* For the relationship to rated voltage see 4.3.2.
** These values correspond to the values given in Table F.1.

Material groups The CTI values above refer to values obtained in accordance
Insulating materials are classified into four groups according to with DIN EN 60664-1 / VDE 0110, Part 1 on samples spe-
their CTI (Comparative Tracking Index) as follows: cially made for this purpose and tested with Solution A. 13

Material group I: 600 ≤ CTI
Material group II: 400 ≤ CTI < 600
Material group IIl a: 175 ≤ CTI < 400
Material group III b: 100 ≤ CTI < 175