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I have an outdoor electrical outlet that powered my 5th wheel RV trailer. 50 amp style plug. It was installed by a licensed electrical I sold my trailer and want to power a shed. The shed will have a small 25 gallon hot water tank and probably 110 air conditioner along with outlets for tools. Can I run a power cord from a small breaker b and plug int ox

  • What sort of tools are you interested in here? (Woodwoorking, welding/machining, ...?) Also, how big is this shed, in square feet? I take it the RV receptacle is installed in a dedicated, surface-mounted box; if so, what make and model is that box? – ThreePhaseEel Apr 10 at 22:06
  • Also, how attached are you to still having a RV receptacle there? – ThreePhaseEel Apr 10 at 23:24
  • Woodworking tools/small office, bartender sink with hot water, beer fridge, microwave and 110 volt a/c. 12x16 shed on wood runners. – Pixel Brain Apr 12 at 1:39
  • So...are you still attached to having a RV receptacle? How far away is the shed from the house? – ThreePhaseEel Apr 12 at 3:13
  • I no longer need the RV outlet. About 15 feet from the house. – Pixel Brain Apr 12 at 15:28
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A feeder can't be a branch circuit.

However, this would require AHJ approval, but I suppose you could run your underground line to the shed using normal & proper wiring methods, and surface it right next to the RV receptacle. Install an inlet there. Then have a 3 foot long jumper cord that you plug in to the inlet and outlet to feed onward to the shed. Don't even think of doing this until you've talked to the AHJ and gotten a general sense of whether they'll approve it.

I would more expect the AHJ to ask "how much harder would it be to simply continue the line on to the panel and do it properly?" You'd want to have a pretty good answer for that.

A more viable option would be to remove the RV receptacle altogether, extend off that junction box the feeder to the shed, converting the branch circuit to a feeder. Then from a subpanel in the shed, install the 50A RV receptacle. If this is wired with #6Cu or #4Al, once it's hardwired you can bump the breaker to 60A, or even 70A if it's THWN-in-conduit.

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  • This. Code requires a subpanel on a detached structure to be wired differently than an outlet would be. Your RV socket might already be on a sub panel, which may make it further complicated. The biggest and most consistent issue is grounding and neutrals, so code enforcement is the way to ask. – J.Hirsch Apr 11 at 11:54
  • I had my main house panel upgraded to a 200 amp service, some recess lighting done and the RV outlet all at the same time. The RV outlet is wired into my new 200 amp panel as the label was added to the two circuit breakers. Could I replace the outlet with a disconnect box and from there run underground up too a panel in the shed? – Pixel Brain Apr 12 at 2:02
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Can you? or Should you? You could, but it probably wouldn't code compliant or safe. If you have 4 wire service (2 hots, neutral & Ground) to the existing outlet I would suggest installing a small sub-panel in the shed and hardwiring it. You'll need to leave the junction box and connections permanently accessable and drive ground rods for the sub-panel, but that would give you the most flexibility in the future.

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