Electrician Help! Wiring to RV Power Pedestal

[matthorr]

Originally Posted by markdoane

I wouldn't run the aluminum inside the dwelling, so I would just measure the trench length and add 7 feet at each end (18 inches deep + 48" above ground + 18" in the box).
I would use copper in the crawl space, but you're the homeowner.

And I thought we were using #2 AWG, not 2/0?

#2 AWG is appropriate per the NEC, but there would be high voltage drop at 80A (I think around 4-5% if memory serves). Upsizing to 2/0 keeps the voltage drop to under 3% at max current. This is assuming a 0.9 power factor. Probably a bit over-engineered but not excessive in additional cost.

I would actually be more concerned about having a splice in the wire than aluminum wire in conduit inside the building. My concern may be misplaced, but I think the splice would increase any risk. The wire's insulation is rated to 90C but the max ampacity at 60C (115A) is well over the 80A circuit breaker - so the possibility of overheating is very small.

[greghoro]

Originally Posted by matthorr

So, my final analysis is to use a 80A double-pole circuit breaker at the main box. For wiring, 2/0 Al for the two hots and neutral. The ground will be 4 gauge. I'll run individual wires - probably easier to handle than the bundled mobile home feeder, anyway. The price for wire almost doubles but the extra $220 is not too bad in the big picture.

Very nice.

Now, document all of this and bring to your local entity responsible for building code inspections and review with them.


Greg

[cwf]

I ran 2 copper for 30' for my 50 Amp AS outlet. Of course this is Texas.