Question: what is the difference between type nm and type nm-b cable?
Answer: Uses for Three Types of Non-Metallic Cable The standard NM cable used for interior residential wiring inside walls and floor and ceiling cavities is known as NM-B. ... Cable with 12-gauge wires has yellow sheathing (used for 20-amp circuits). Cable with 10-gauge wires has orange sheathing (used for 30-amp circuits).