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I need to install 2 outlets 240v 20A I plan to run them off the same breaker as they will not be used at the same time so not worried about over amps.

I want one on one side of my garage and one on the other. I have a finished garage so running stuff through the walls is a real PITA so I figure I can run Romex to a junction box in the middle of the loft space (which is tight) and then run armored wire from there to the outlet on the outside of the sheetrock. I already have a good section of normal yellow Romex which is why I wanna use as much as possible so I can save on buying as little as possible of the armored stuff.

The reason I don't run to the walls is because the slopes on the roof are so that I can't get into the corners to drill a hole to get down into the siding so I have to go on the outside of the walls.

The side the breaker box is on is the peak so getting there to drill a hole and whatnot was easy.

Can I use a plastic junction box for this or do I need to use the metal one? Or is there a better way to do this entirely?

nobody
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rasmukri
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1 Answers1

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A metal box makes the most sense for a lot of reasons. A metal box works well with pretty much any type of conduit, armored cable, Romex (non-metallic cable), etc.

But keep in mind you have multiple options. The key is that cable must be protected if not inside the walls. Options include wires (or cables, if the conduit is large enough) inside:

  • Rigid metal conduit
  • PVC Schedule 80
  • Flexible metal conduit

But other possibilities are any type of metal or wood enclosure around cables (but not individual wires) to provide the necessary protection. Unlike with individual wires, there are no specific electrical requirements - the cable is handling all of that. For example, you could run yellow Romex from the breaker to a nice metal junction box, and join it to two separate lengths of yellow Romex to go to each of the receptacles. Between the ceiling and 8 feet above the floor you route those cables into conduit or attach it to the wall and box it in with furring strips (e.g., 3 x 1"x2"x8' will run you all of $3.81 at Home Depot right now). In fact, unless you have appropriate conduit lying around, boxing Romex inside 1x2s is going to be the most cost-effective thing to do, by far.

manassehkatz-Moving 2 Codidact
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