AC Cable to NM (ROMEX®)

Discussion in 'Electrical Forum discussion & Blog' started by mrhoades, Jan 30, 2009.

  1. mrhoades

    mrhoades New Member

    Messages:
    8
    My house built in the late 40's uses old BX cable (no bonding strip) and an 1980's renovation using AC cable w/the bonding strip. I would like to begin finishing my basement.... Am I allowed to add new circuits using NM (ROMEX®). If so how do I ground inside the fuse box?
    Last edited by a moderator: Dec 7, 2011
  2. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,542
    Location:
    North Carolina
    If an armored cable is being used I hope that there is a metal box also. The equipment grounding conductor of the NM cable bonds to this metal box
  3. RayP

    RayP Vocational Instructor

    Messages:
    13
    Location:
    Syracuse NY
    Yes

    You can as long as you have the correct ground. Easy way to do this is replace your box and grounding electrode, and also the service cable. This sounds hard but is not. You can pay to have an electrician do it for $500-$1000, where I am (upstate NY). Homeowners can do it themselves here, after claiming to have the skill. You then need to have it inspected before cut in by the utility company.
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,542
    Location:
    North Carolina
    Why would you need to do all this just to convert from AC to MN?
  5. GabeS

    GabeS Remodel Contractor

    Messages:
    294
    Location:
    Brooklyn NY
    The old armored cable without the bonding strip: That stuff is grounded. When I test that wiring it shows ground.

    Is it not allowed to connect new bx to the old?
  6. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT
    This thread should be a good one... :D
  7. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT
    If the AC cable does not contain a bonding strip then you cannot use the jacket as an equipment ground, nor extend those circuits with NM. Just start installing new circuits with NM back to the panel. Which I believe was your orginal question to begin with, Inside the panel the grounds and neutral conductors tie to the same bus.
    Last edited: Feb 1, 2009
  8. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT
    I dont know why your suggesting any of that...
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