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dcalabro
Protecting NM Through Steel Bottom Plate

I framed up a steel stud partition wall on the first floor and used plastic bushings to protect the nm across the studs but the feed comes through the floor from the basement. First I drilled out a 1inch hole in the steel bottom plate then used a half inch bit to drill through the floor so even as the nm comes through the floor, it can't directly touch the metal edges. Is there a special bushing or method for protecting the wiring in this case?

dj1
Re: Protecting NM Through Steel Bottom Plate

You need to use MC electrical wire (in spiral metal protection).

Re: Protecting NM Through Steel Bottom Plate

Another approved method in a residential setting would be to provide a short piece of PVC pipe to protect the NM when passing through sharp metal.

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