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Posted to alt.home.repair
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Romex cable
"dpb" wrote in message
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WW wrote:
What is the difference between NM and NMB romex cable? Code here now will
not allow NM to be used. WW
Plain NM w/o any following designation is the old, original "Romex (tm)"
that used fiber insulation and hence was dry-only application. NM-C
followed w/ the plastic. NM is, for the most part, unavailable.
AFAIK, the "B" designation is for building application and is the
nomenclature for the color-coded sheathing of white/yellow/etc. designed
to aid in ensuring proper conductor size is used in appropriate circuits
and making for easier/quicker verification during inspection.
--Type NM was manufactured into the 80's and had thermoplastic covering,
and came in a variety of colors like white, black, and blue. Type NMC, and
NMS are non metallic cables with different properties, for other purposes.
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