Electrical – How to connect metal conduit to in-wall NM cable

conduitelectrical

I have NM cable in metal conduit running along a wall. At a corner, the conduit enters wall space, and ends at a metal box in the wall. The line is continued by in-wall NM. How should I handle the point where the conduit enters the wall? Just a hole in the sheetrock?

Best Answer

It sounds like you're sheetrocking over the existing wiring. If that's correct, I think this would work. The challenge is you want to make the transition from conduit to plain NM in a box, and you want the plain NM concealed inside a wall, not out in the open where it's exposed to damage.

  • remove the box from the end of the conduit
  • install two boxes in the face of the new wall, maybe one at switch or sconce height, one at receptacle height. (These boxes will be accessible through the new sheetrock.)
  • Cut the existing NM mid way between the new boxes
  • extend the conduit to the upper box (with the NM in it)
  • splice in a new piece of NM from the upper box to the lower box
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