What protects cable from abrasion at the duct edge?

What protects cable from abrasion at the duct edge?

• A. Rubber sheath
• B. Fair leader
• C. Cable wrap
• D. Heat shield

Answer: (B)

When cables move through a duct, the edge can grind or nick the insulation if there isn’t a smooth entry. A fair leader provides a short, smooth guide that directs the cable away from sharp edge surfaces, creating a gentle transition and reducing friction so the insulation isn’t damaged. It also helps distribute pulling force to prevent wear at the edge. The rubber sheath is part of the cable itself, not a separate edge protection device. A cable wrap is for bundling or protecting cables in general, not specifically guiding them through a duct edge. A heat shield protects against heat, not abrasion. So the device that best protects the cable from abrasion at the duct edge is the fair leader.

When cables move through a duct, the edge can grind or nick the insulation if there isn’t a smooth entry. A fair leader provides a short, smooth guide that directs the cable away from sharp edge surfaces, creating a gentle transition and reducing friction so the insulation isn’t damaged. It also helps distribute pulling force to prevent wear at the edge. The rubber sheath is part of the cable itself, not a separate edge protection device. A cable wrap is for bundling or protecting cables in general, not specifically guiding them through a duct edge. A heat shield protects against heat, not abrasion. So the device that best protects the cable from abrasion at the duct edge is the fair leader.