What is the maximum interval for securing wiring with staples along a wire run?

What is the maximum interval for securing wiring with staples along a wire run?

• A. 36 inches
• B. 54 inches
• C. 60 inches
• D. 72 inches

Answer: (B)

Wiring must be secured and supported along its run so it doesn’t move or get damaged. The standard rule for securing NM cable is to place supports at intervals not exceeding four and a half feet. That distance equals 54 inches. This spacing helps prevent cable movement, reduces wear on the insulation at staples, and keeps the run protected from physical damage and stress near terminations. In practice, supports are placed so you don’t exceed that 54-inch interval, ensuring the cable stays securely in place throughout the run.

Wiring must be secured and supported along its run so it doesn’t move or get damaged. The standard rule for securing NM cable is to place supports at intervals not exceeding four and a half feet. That distance equals 54 inches. This spacing helps prevent cable movement, reduces wear on the insulation at staples, and keeps the run protected from physical damage and stress near terminations. In practice, supports are placed so you don’t exceed that 54-inch interval, ensuring the cable stays securely in place throughout the run.