Replace rope if wire diameter wear is _____ or more?

Replace rope if wire diameter wear is _____ or more?

• A. 1/4 or more
• B. 1/3 or more
• C. 1/2 or more
• D. 2/3 or more

Answer: (B)

When evaluating rope wear, the critical factor is how much the rope’s diameter has been reduced. The strength of a rope comes from its cross-sectional area, which depends on the diameter. If the diameter has worn down by one-third or more (leaving two-thirds of the original diameter), the remaining cross-sectional area—and thus the rope’s strength—drops significantly (to about 4/9 of its original area). This substantial loss in strength raises the risk of failure under load, so replacing the rope at this point is the safest practice. If wear is less than one-third, the rope may still be usable, but it should be monitored for progressive wear.

When evaluating rope wear, the critical factor is how much the rope’s diameter has been reduced. The strength of a rope comes from its cross-sectional area, which depends on the diameter. If the diameter has worn down by one-third or more (leaving two-thirds of the original diameter), the remaining cross-sectional area—and thus the rope’s strength—drops significantly (to about 4/9 of its original area). This substantial loss in strength raises the risk of failure under load, so replacing the rope at this point is the safest practice. If wear is less than one-third, the rope may still be usable, but it should be monitored for progressive wear.