Medium System & Equipment Voltages Table

(DERIVED FROM ANSI STANDARDS AND MANUFACTURES LISTINGS)
Nominal System Voltages (a)
Capacitors

3-Wire

4-Wire

3-Phase (a) Transformers

Motors & Control
Line
to Line

Y-Connected
2400
2400
2300
2400
4160Y/2400
4160Y/2400
4160
2400
4160*
4160
4000
4160
2400
4800
4800
4600
4800
2770
6900
6900
6600
8320Y/4800
8320Y/4800
4800
12470Y/7200*
12470Y/7200
12470
7200
13200Y/7620*
13200Y/7620
13280
7620
13800*
13800
13200
13800
7960
20780Y/1200
20780Y/12000
22860/13200
22860Y/13200
13280
23000
13280
24940Y/14400*
24940Y/14400
14400
34500Y/19920*
34500Y/19920
19920
34500
19920
*Recommended system voltages per ANSI, C84.1

(a) 3-wire system voltages are those most commonly used in industrial and large commercial installations and may be used by utilities to serve large customers. Transformers for these voltages may be delta or wye-connected and with or without neutral grounded. 4-wire system voltages are those used by utilities for distribution with the neutral being extended for supply to single-phase transformers.



1