The non metallic nm designation refers to the outer sheathing that bundles individual wires together like a cable.
Non metallic wire.
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This is in contrast to metallic sheathed cable or conduit wiring in which the bundle of individual conductors is protected by some form of a metal coil or metal conduit.
Non metallic jacket wire non metallic wire by the roll our romex simpull nm b can be used for exposed and concealed work in normally dry locations at temperatures not to exceed 90 c primarily used in residential wiring as branch circuits for outlets switches and other loads.
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Typically there are three parts to nm electrical cable.
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.