What are the maximum distances for securing NM cable near a box and between supports?

• A. Within 12 inches of a box and no more than 6 feet between supports
• B. Within 8 inches of a box and no more than 4.5 feet between supports
• C. Within 4 inches of a box and no more than 2 feet between supports
• D. Within 18 inches of a box and no more than 10 feet between supports

Answer: (B)

NM cable must be secured so it cannot move or be strained at its terminations, and so the run stays protected along its length. The first securing point has to be within 8 inches of a box, cabinet, or fitting. This keeps the cable from pulling on the box and ensures the termination stays protected from movement or vibration right at the entry. After that, the cable must be supported at intervals not exceeding 4.5 feet along the run to prevent sagging, bending, or abrasion that could damage the conductors. Using staples, straps, or listed fasteners rated for NM cable is important, and any run through framing or near edges should be protected with nail plates to avoid nicks. So the correct practice is securing NM cable within 8 inches of a box and no more than 4.5 feet between supports.