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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.
With electrical wire that runs in the familiar plastic or vinyl jacket--called NM (for non-metallic) cable--the labeling is fairly easy to understand. NM cable will be identified by its wire gauge (such as 12-gauge or 14-gauge), and by its designated usage, but there's not much more you need to know when buying NM cable.