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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.
Electrical wires have markings stamped or printed on the outside sheath of the cable. These markings tell what type and size of wire that you have. But looking deeper, the color of the wires inside of the sheath, like in type NM cable, will reveal that different color wires serve different purposes.