I'm at a job where they have a const trailer w/ a 125A panel that is to be fed from a building 200ft. away from that bld's 400A MDP.My question is can the trailers panel be grounded w/ a conductor from the MDP's ground bus or can you just run the 2 hots w/ neutral from MDP and ground the trailer panel w/a ground rod at the trailer, or both?
construction trailer
- Thread starter mickvolt
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bphgravity
Senior Member
- Location
- Florida
Carefully review 250.32 of the NEC. You have options.
- Location
- Massachusetts
First off no matter if you bring and EGC or not to the trailer 250.32(A) requires a grounding electrode system to be installed and connected to the grounding bus of the trailers panel.
Normally I would agree with BPHGravity that 250.32(B) gives you both those options, however in the case of a job trailer I have never seen one that was not set up for 2 hots, 1 Neutral, 1 EGC.
We run a feeder with an EGC to the trailer from the supply source per 250.32(B)(1) and we install two ground rods at the trailer per 250.32(A) and 250.56.
mickvolt said:
Normally I would agree with BPHGravity that 250.32(B) gives you both those options, however in the case of a job trailer I have never seen one that was not set up for 2 hots, 1 Neutral, 1 EGC.
We run a feeder with an EGC to the trailer from the supply source per 250.32(B)(1) and we install two ground rods at the trailer per 250.32(A) and 250.56.
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