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  1. #1
    Join Date
    Mar 2009
    Posts
    238

    Default 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?
    My advice and opinions come from hands on knowledge...and This Old House Hidden Content

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,762

    Default Re: Protecting NM Through Steel Bottom Plate

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

  3. #3
    Join Date
    Jan 2011
    Location
    Columbiana, Alabama
    Posts
    739

    Default 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.
    Good Luck from Columbiana, Alabama
    Maurice Turgeon, Hidden Content

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