In California 16kv is very common followed by 12kv, the lines are usually 3 wire on the HV and have no neutral. Transformers are connected L-L or delta. There are some 4 wire lines where the HV neutral is insulated, and those are typically 2.4/4.16kvY.
Outside of California 4 wire is common for the HV with the neutral multi grounded (multi grounded mostly forbidden in California). Typical voltages are 7.2/12.47Y, 7.6/13.2Y, 7.9/13.8kvY, 13.2/23kvY, 14.4/25kvY and 19.9/34.5kvY. 2.4/4.16Y and 4.8/8.36kvY often found on older systems which are now obsolete.
Last edited by Meadow; 09/29/16 09:39 AM.
