History of non metallic cable use nm cable was invented by the romex company in 1922 and was first described and listed by the nec national electrical code in 1926 but it did not come into prevalent use until the early 1960s when plastics replaced woven rayon as the material used for the outer sheathing.
Non metallic wire.
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Outer cable sheathing wire insulation and wire.
Typically there are three parts to nm electrical cable.
The non metallic nm designation refers to the outer sheathing that bundles individual wires together like a cable.
Nylon 12 awg residential wire for outlets switches and other loads copper cu conductors for dry locations up to 90 degrees celsius or 194 degrees.
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