Conductors should be supported at what interval in cable tray?

• A. 3 ft or less
• B. 6 ft or less
• C. 9 ft or less
• D. 12 ft or less

Answer: (A)

Conductor support inside a cable tray must be frequent enough to keep cables secure, prevent movement, and protect terminations from stress. Keeping conductors supported at 3 feet or less minimizes bending, reduces vibration or displacement from equipment, and helps maintain tray organization and safety.

Longer spacings—like 6, 9, or 12 feet—allow more sag and movement, increasing the risk of damage to the conductors and strain at terminations. The tighter 3-foot interval is chosen to maintain mechanical integrity and reliability in the cable tray environment.