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    TGalleo's Avatar
    TGalleo Posts: 2, Reputation: 1
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    #1

    Jan 24, 2010, 05:34 PM
    What does the b stand for in electrical wire nm-b?
    Relative to the electrical wire rating of nm-b, I understand the nm stands for non metallic but what does the b designate?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Jan 24, 2010, 06:23 PM

    The letters NMB on the jacket of the wire. The NM means nonmetallic sheath cable (Romex) and the B suffix means that the cable's conductors are rated for a maximum operating temperature of 90°C 194°F. We can assume that wiring made prior to 1984, without the B suffix, is rated at 60°C 140°F. This is the type of wiring found in most older homes that were built before 1982. This is one source.
    TGalleo's Avatar
    TGalleo Posts: 2, Reputation: 1
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    #3

    Jan 24, 2010, 08:52 PM

    Thanks Stratmando!
    Best regards!
    TG
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