What load is the minimum that technical use ascenders can cut through rope sheaths?

• A. 1,000 lbs
• B. 1,200 lbs
• C. 1,500 lbs
• D. 2,000 lbs

Answer: (B)

The key idea here is how ascenders grip rope and where damage can happen. Ascenders have teeth that grip the rope, and when you load the device, those teeth press into the rope’s outer sheath. The sheath is the protective outer layer, and it’s thinner and more vulnerable than the core. There’s a threshold at which the pressure from the teeth can begin to slice or cut through that sheath. That threshold is around 1,200 pounds of load. So, at about 1,200 pounds, the risk of sheath damage becomes real; below that, the sheath tends to stay intact, and above that, damage becomes more likely with continued loading or movement.

This matters because damage to the sheath doesn’t necessarily break the rope immediately, but it compromises protection for the core and accelerates wear, which can lead to rope failure under later use. After noticing sheath damage, the rope should be retired from service and inspected more thoroughly.

The other options fall outside this typical cut-through threshold: they’re either below what the teeth can reliably damage the sheath, or well above it, and aren’t the standard minimum observed for sheath compromise.