What is the cable and conductor securing interval?

• A. 2 ft
• B. 3 ft
• C. 4 ft
• D. 5 ft

Answer: (B)

Securing cables and conductors at regular intervals is about giving them solid mechanical support so wind, vibration, and movement don’t stress the jackets, connectors, or terminations. The established interval is three feet, which provides enough support to keep the run from sagging or flexing excessively while keeping installation practical and easy to inspect.

Choosing three feet balances safety and practicality: spacing them farther apart, like four or five feet, allows more sway and can lead to wear at clamps, abrasion on the cable jacket, and potential loosening of terminations. Placing supports much closer, such as two feet, adds hardware and labor without delivering a meaningful safety gain for typical site conditions.

So the three-foot interval is the standard that ensures reliable support, minimizes movement-related issues, and remains efficient to install and inspect.