What is the minimum breaking strength of general-use life safety rope?

What is the minimum breaking strength of general-use life safety rope?

• A. 5,000 lbf
• B. 7,500 lbf
• C. 12,000 lbf
• D. 9,000 lbf

Answer: (D)

The main idea here is knowing the rating that life safety rope must meet. For general-use life safety rope used in rescue, the standard requires a minimum breaking strength of 9,000 pounds-force. This means the rope should hold at least that much load before it fails, even when you account for knots, hardware, wear, and the dynamic forces that happen when someone is supported or lowered.

That 9,000 lbf benchmark also supports a practical working load limit. With a typical safety factor around 5:1, the usable working load would be about 1,800 lbf, giving a substantial margin for safety during operations. Other offered numbers don’t meet this defined requirement for general-use life safety rope, so 9,000 lbf is the correct standard.