3.
**These values correspond the values given Table F.
.3b
Single-Phase, 3-Conductor Systems
Nominal Voltage the
Power Supply System
(Mains)*
Voltages for Table F.
Table F.4
For insulation conduc-
tor-to-conductor1)
For insulation conductor-to-ground1)
All systems
V
Three-phase, 4-conductor
systems with grounded
neutral conductor2)
Three-phase, 3-conductor
systems, non-grounded1)
or grounded conductor
V V
60 63
110
120
127
125 125
150** 160 160
200 200 200
208 200 125 200
220
230
240
250 160 250
300** 320 320
380
400
415
400 250 400
440 500 250 500
480
500 500 320 500
575 630 400 630
600** 630 630
660
690 630 400 630
720
830 800 500 800
960 1000 630 1000
1000** 1000 1000
1)
Conductor-to-ground insulation level for non-grounded impedance-grounded systems equals that for conduc-
tor-to-conductor, the operating voltage ground any conductor can, practice, approach full conduc-
tor-to-conductor voltage.wago.1.2.17
www.
2)
For equipment used both three-phase, 4-conductor and three-phase, 3-conductor systems, grounded and non-
grounded, use only the values for 3-conductor systems.
*For the relationship rated voltage, see 4. This because the actual voltage ground determined the insulation resistance
and capacitive reactance each conductor ground; thus, low (but acceptable) insulation resistance one con-
ductor can effect ground and raise the other two full conductor-to-conductor voltage ground.com
WAGO Rail-Mount Terminal Block Systems
Technical Information
Material Groups
Insulation materials are classified into four
groups according their Comparative
Tracking Index (CTI) follows:
Material Group 600 CTI
Material Group II: 400 CTI 600
Material Group IIla: 175 CTI 400
Material Group IIIb: 100 CTI 175
The CTI values above refer values
obtained accordance with DIN EN
60664-1/VDE 0110-1 samples specially
made for this purpose and tested with Solu-
tion A
