Which design factor is standard for rotation-resistant rope used in lifting personnel?

Which design factor is standard for rotation-resistant rope used in lifting personnel?

• A. 10 to 1
• B. 5 to 1
• C. 8 to 1
• D. 12 to 1

Answer: (A)

The design factor for life-safety rope used to lift personnel is the margin between the rope’s strength and the maximum load it must carry. For rotation-resistant rope used in lifting people, the standard design factor is ten to one. This means the rope’s minimum breaking strength should be about ten times the expected maximum working load, providing a safety buffer for dynamic shock loads, knots, wear, and other real-world conditions that can increase the load. Rotation-resistant rope is favored here because its construction minimizes twisting and helps maintain predictable performance under load, which is crucial for personnel safety. Lower margins, like five to one or eight to one, offer less protection against dynamic effects, while a much higher factor like twelve to one would be more conservative than typically required in standard practice.

The design factor for life-safety rope used to lift personnel is the margin between the rope’s strength and the maximum load it must carry. For rotation-resistant rope used in lifting people, the standard design factor is ten to one. This means the rope’s minimum breaking strength should be about ten times the expected maximum working load, providing a safety buffer for dynamic shock loads, knots, wear, and other real-world conditions that can increase the load. Rotation-resistant rope is favored here because its construction minimizes twisting and helps maintain predictable performance under load, which is crucial for personnel safety. Lower margins, like five to one or eight to one, offer less protection against dynamic effects, while a much higher factor like twelve to one would be more conservative than typically required in standard practice.