Which statement is true when comparing a 6×37 rotation-resistant rope to a 6×37 IWRC rope?

Which statement is true when comparing a 6×37 rotation-resistant rope to a 6×37 IWRC rope?

• A. Rotation-resistant rope has higher breaking strength.
• B. Rotation-resistant rope has lower breaking strength.
• C. Rotation-resistant requires lower safety factor.
• D. IWRC rope has higher breaking strength, and rotation resistant requires a higher safety factor.

Answer: (D)

Rotation-resistant construction focuses on limiting how the rope twists under load, not on maximizing the load the rope can directly carry. The independent wire rope core (IWRC) provides a solid, load-bearing backbone that supports the strands and maintains geometry under tension, which generally gives higher breaking strength for the same nominal size. Because rotation-resistant ropes can behave differently under dynamic loads and may have less headroom for peak forces, a higher safety factor is often used with them. So, the statement that the IWRC rope has higher breaking strength, and that rotation-resistant requires a higher safety factor, best reflects how these constructions perform in practice.

Rotation-resistant construction focuses on limiting how the rope twists under load, not on maximizing the load the rope can directly carry. The independent wire rope core (IWRC) provides a solid, load-bearing backbone that supports the strands and maintains geometry under tension, which generally gives higher breaking strength for the same nominal size. Because rotation-resistant ropes can behave differently under dynamic loads and may have less headroom for peak forces, a higher safety factor is often used with them. So, the statement that the IWRC rope has higher breaking strength, and that rotation-resistant requires a higher safety factor, best reflects how these constructions perform in practice.