Multiple trailers on residential lot and grounding

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JoeNorm

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I have a client that wants power to at least 3 trailers(think old Airstreams). Most are gutted with remnants of DIY electrical systems inside. I have agreed to supply power to a receptacle outside the units but not go further than that.

My question is about ground rods. Does a 1-pole 30amp circuit feeding a 30amp receptacle need a ground rods driven? It doesn't seem like the panel in the trailer would have a GES because theoretically they can move, so you'd have to detach it each time.

Would the answer change with a 4-wire feed for 240v? Thanks for the help
 
250.32(A) exception does not require grounding electrode system at a structure supplied by only a single branch circuit.

I don't think there is anything in 551 that changes this.
 
See 551.75 (rod not needed)
You might want to read 551.71. Your inspector will likely require more than the one 30 amp receptacle.
 
Ok, so I am supplying receptacles. They are single circuit until the homeowner plugs in a cord that supplies a small panel, and then they become more like feeders. I am intentionally staying away from the other side of the install but want to set them up for the safest install possible.
 
JoeNorm said:
Ok, so I am supplying receptacles. They are single circuit until the homeowner plugs in a cord that supplies a small panel, and then they become more like feeders. I am intentionally staying away from the other side of the install but want to set them up for the safest install possible.
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NEC in general kind of stops at the receptacle. What is beyond the receptacle usually subject to other standards. Otherwise it would get to where you would need to file permits and have inspections every time you plugged in a RV at such sites. But instead they inspect up to the receptacle and it generally stops there.
 
In WA trailers, mobile homes, etc are factory assembled structures (fas) and require permits/inspections from the fas division of L&I. Yes do not get involved with inside wiring, it will be more time and headaches. Stop at the plug as others said
 
tom baker said:
In WA trailers, mobile homes, etc are factory assembled structures (fas) and require permits/inspections from the fas division of L&I. Yes do not get involved with inside wiring, it will be more time and headaches. Stop at the plug as others said
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Same here. Even if not individually inspected when built, the facility they are built in has certification credentials. They could potentially have random inspections at times though, that even more so with manufactured homes. Have heard of issues with that before if the manufactured home is made in another state and hasn't had prior approval before being moved here. If made in any the places within state - they only care about inspecting the supply wiring or anything else added on site, the factory is already approved for homes they sell in state and AFAIK do occasionally get visited at the production plant by State AHJ just to check up on them and make sure they not cheating on their builds.
 
Say: "Quote is based on the understanding that ground rods are not required by code for the application. If the AHJ requires ground rods, that will be a change order."
 
Several companies make nice outdoor boxes that have various combinations of of 20, 30, and 50 amp outlets with associated breakers. I'd use on of those.
 
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