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NM Cable. NM cable stands for nonmetallic cable and is a fully self-contained electrical wiring product. The cable often has 3 wires (positive, neutral and ground) inside a hard plastic or rubber sheathing. It is relatively inexpensive and is extremely easy to work with.
However, this wire count does not include an uninsulated wire that is used as a ground wire, which may or may not be mentioned but is almost always present in modern cabling.. For instance, if the cable lists 12-2 WG, it means there are two insulated 12-gauge wires (a black and a white wire), plus a ground wire.t is incorrect to use Romex to refer to NM cable generically, as the Romex name is a trademarked brand of the Southwire Company. In modern products, the color of the NM cable sheath (or jacket) indicates either the gauge of the current carrying conductors within it, or special properties of the sheathing itself.