Barn A contains the main panel. Barn B has a subpanel fed from Barn A via (3) 2-0 aluminum conductors, 2 hot and 1 neutral, with a 60amp breaker in the main panel. There is no grounding conductor between the main panel and subpanel. The water line between barns is PVC. Barn B was built in 2000. There is no ground rod in Barn B.

My plans for Barn B include at least one new lighting branch circuit, and a 50 amp RV receptacle (NEMA 14-50r).

My question(s):

  1. How should the ground wires for the existing and future 120V branches be connected?
  2. How should the ground wire for the 50 amp RV receptacle be connected?
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    Direct burial, unless the conduit ends underground. I can see where the 3 wires come up out of the ground at Barn B. Barn B is a wood-frame pole building, so no grounded rebar, piles, ect. – Greenfun2 Jul 3 at 2:58
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    Well, that was poorly done, as even direct burial rated cable (if this is) is supposed to be protected where it comes out of the ground. I suspect you are going to have to add a grounding cable to sort this mess out. If the "electrician" involved is still around, you might want to sue them for malpractice. Depending on your actual loads, I guess you COULD consider the "transformer trick" where by using a transformer at each end of the cable, the supply at the far end becomes a new primary supply and you don't need a ground connection back to the source. – Ecnerwal Jul 3 at 3:00
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    Some of the exposed wire can be blamed on erosion, but not all of it. I was hoping to be able to safely avoid running a wire; it's just over 400 feet between barns. Actual load probably wont exceed 30 amps. A 16 amp AC unit (actual running current, 20 amp circuit), a 1.5 amp camper fridge, a handful of CFL lights, and a 750 watt microwave. – Greenfun2 Jul 3 at 3:26
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    @Greenfun2 -- are you OK with parts that you are going to have to do a bit of work to find? There is a way out of this without running wire per se, but it requires something (namely, a distribution transformer) that's rather outside what big-box stores carry.... – ThreePhaseEel Jul 3 at 3:44
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    One more thing: is there a space outside Barn B that can be used for a fairly sizeable piece of electrical equipment? – ThreePhaseEel Jul 3 at 3:45

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