RV Dealership Power for Trailers

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Mark1254

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Location
Ohio
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Electrical Engineer
We're reviewing the code requirements (551.7X Recreational Vehicle Parks) and have several questions.

Looking at putting in at the RV dealer power for trailers for sales demonstrations. 551.77 (A) states that the electrical supply equipment has to be located on the road side of the trailer, no more then 5-7 feet from the side. Would this requirement apply to an RV dealer?

Our plan is to set pressure treated 6 by 6 poles in the ground and mount two separately fed 50A outlets on one pole. One pole would be shared between two trailers with the separate outlets. Alternatively we would have to install a pole behind each trailer.

With the light load (sales demo) we plan on feeding each outlet with #10 wire protected with 30A circuit breakers. The conductors will be THWN in 1" CPVC buried 18" deep (minimum).

Thoughts?

Thanks
Mark
 
Even if putting the 50A receptacle on a 30 amp circuit is allowed, I don't know that it would be a smart move. What happens when a prospective buyer turns everything on in the RV theyre looking at and the power goes out. Not a good look.

If it were me, I would look at figuring a feeder size and run aluminum quad from source and loop through all the locations. Use application specific power outlets, here I would use Midwest U004CTL010 which has 2x 14-50R and one 5-20R GFI, all with breakers and its a 3R enclosure / in use cover -you should be able to get them in the mid $200s. Would save alot of trouble with boxes and inuse covers for your 14-50s. Figure all the costs and labor and you might come out close in cost to the original plan. These power outlet boxes usually have max 1-1/2" KOs on the bottom so check that and wiring space vs your feeder size.
 
Mark1254 said:
Would this requirement apply to an RV dealer?
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In my opinion, no. This is a demonstration installation, not a residential feeder installation.

You're just turning on the lights. You could arguably use extension cords if you wanted to.
 
I agree with Larry, this is a display, as such, you could do 50 amp loop type pedestals. Due to voltage drop, a larger wire size might be required, but quite a few could be ran off the same feeder, as the likelihood of full load being drawn on more than a couple at a time would be remote. Is this a lot as big as say, Camping Theives have? Or a mom and pop operation?
 
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