Transformer Grounding

[Jsantangelo]

I have a 25KVA center tap transformer (secondary is 120/240VAC) with 110 amp fuses on the secondary. What size does the ground conductor need to be if I am connecting it to the ground lug of the transformer and jumping from the transformer ground lug to the neutral conductor.

Joe Santangelo

 

[augie47]

The system bonding jumper and equipment bond jumper should be sized from 250.66 based on your transformer phase conductors.

IF your phase conductor is #2, then a #8.