What is the minimum breaking strength of a G-rated life safety rope?

• A. 10 kN (2250 lb)
• B. 20 kN (4500 lb)
• C. 30 kN (6750 lb)
• D. 40 kN (9000 lb)

Answer: (D)

G-rated life safety rope is specified to have a minimum breaking strength of 40 kN (about 9,000 lb). This rating ensures enough strength to withstand the loads encountered in rescue scenarios, including forces transmitted through anchors, hardware, knots, and the potential dynamic/shock loading that can occur during a rescue. The lower figures (10, 20, or 30 kN) do not meet the standard and would not provide the required safety margin for life-safety operations. Therefore, 40 kN is the minimum breaking strength specified for G-rated life safety rope.