Voltage Definition
Nominal Voltage: voltage between phases for which the system is designated.
Operating Voltage: electrical potentiel difference between 2 conductors in normal conditions.
The cable voltage (Uo/U) is designed by 2 values:
- Uo is voltage between phase and neutral
- U is voltage between phases
For alternative current system having a nominal voltage between 100 V and 1000 V
Operating Nominal Voltage |
Cable Voltage |
50 Hz |
60 Hz |
230/400 V (+ or - 10%) |
277/480 V |
300/500 V |
400/630 V (+ or - 10%) |
480 V |
450/750 V |
1000 V |
600 V |
0.6/1 kV |
For alternative current system having a nominal voltage above 1 kV and less than 35 kV (3 phases)
50 Hz |
Cable Voltage |
Highest voltage of equipment |
Operating Nominal Voltage |
3.6 kV |
3 kV or 3.3 kV |
1.8/3 (3.6) kV |
7.2 kV |
6 kV or 6.6 kV |
3.6/6 (7.2) kV |
12 kV |
10 kV or 11 kV |
6/10 (12) kV |
17.5 kV |
15 kV |
8.7/15 (17.5) kV |
24 kV |
20 kV or 22 kV |
12/20 (24) kV |
36 kV |
33 kV |
18/30 (36) kV |
60 Hz |
Cable Voltage |
Highest voltage of equipment |
Operating Nominal Voltage |
4.4 kV |
4.16 kV |
3.6/6 (7.2) kV |
14.5 kV |
13.8 kV |
8.7/15 (17.5) kV |
26.4 kV |
24.94 kV |
18/30 (36) kV |
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