Transformer Grounding

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Jsantangelo

Member
Location
Columbus,Ohio
Occupation
Electrical Design Engineer
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

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
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.


transformer installations.jpg
 
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