Feeding single phase 480V-120/240V transformer, grounding

morgan3520

Member
Location
Dallas, TX
Occupation
Electrical Engineer
I have a switchboard circuit feeding a single phase 480V-120/240V transformer (50kVA). Is a ground conductor suppose to be ran with the current carrying conductors? Or is it just two hot, L1-L2?
 
For the primary since it 1Ø you'll need only 480 volts with two ungrounded conductors. On the secondary you'll need a neutral conductor for 120 volts. Not sure what you mean by a "ground conductor".
 
For the primary since it 1Ø you'll need only 480 volts with two ungrounded conductors. On the secondary you'll need a neutral conductor for 120 volts. Not sure what
For the primary since it 1Ø you'll need only 480 volts with two ungrounded conductors. On the secondary you'll need a neutral conductor for 120 volts. Not sure what you mean by a "ground conductor".
Thanks
you mean by a "ground conductor
 
The primary circuit needs an EGC run with it. Potentially can be metal raceway as the EGC.

The derived secondary system needs a GEC run to the building GES.

It can be possible to have one conductor sized for the larger of the two that fulfils both purposes.
 
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