One-half inch lifeline has a tensile strength of which value?

One-half inch lifeline has a tensile strength of which value?

• A. 9000 lbs
• B. 600 lbs
• C. 4500 lbs
• D. 12000 lbs

Answer: (A)

Tensile strength is the maximum load a rope can withstand before it fails. For a 1/2 inch firefighter lifeline, the standard breaking strength is about 9,000 pounds, which is the rating used in NFPA 1983 guidelines to ensure safety under anticipated rescue and fall scenarios. That’s why 9,000 pounds is the best answer—the other options don’t match typical lifeline ratings for this size. Remember, the working load limit is lower than the breaking strength, but this question refers to the rope’s tensile (breaking) strength.

Tensile strength is the maximum load a rope can withstand before it fails. For a 1/2 inch firefighter lifeline, the standard breaking strength is about 9,000 pounds, which is the rating used in NFPA 1983 guidelines to ensure safety under anticipated rescue and fall scenarios. That’s why 9,000 pounds is the best answer—the other options don’t match typical lifeline ratings for this size. Remember, the working load limit is lower than the breaking strength, but this question refers to the rope’s tensile (breaking) strength.