Which technique or tool is used to detect hidden obstructions in conduit before pulling the cable?

Which technique or tool is used to detect hidden obstructions in conduit before pulling the cable?

• A. Test pull
• B. Conduit brush
• C. Mandrel
• D. Reel Brakes

Answer: (A)

A test pull is used to detect hidden obstructions in conduit before pulling the cable. By threading a light pulling line through the conduit and pulling it with very low tension, you can feel for resistance, snag points, or tight spots that indicate debris, bends, or misaligned fittings. If the line passes easily, you’re confident the actual cable pull will go smoothly; if resistance is felt, you pause to clear obstructions or correct path issues before risking damage to the cable. Cleaning with a conduit brush helps remove debris but doesn’t reveal hidden problems, and a mandrel checks interior size but isn’t as direct for sensing how the actual pull will behave; reel brakes control payout, not obstruction detection.

A test pull is used to detect hidden obstructions in conduit before pulling the cable. By threading a light pulling line through the conduit and pulling it with very low tension, you can feel for resistance, snag points, or tight spots that indicate debris, bends, or misaligned fittings. If the line passes easily, you’re confident the actual cable pull will go smoothly; if resistance is felt, you pause to clear obstructions or correct path issues before risking damage to the cable. Cleaning with a conduit brush helps remove debris but doesn’t reveal hidden problems, and a mandrel checks interior size but isn’t as direct for sensing how the actual pull will behave; reel brakes control payout, not obstruction detection.