Under what condition should a wire rope be replaced?

A wire rope is a crucial component of crane operation, and its integrity is essential for safe lifting practices. The condition stated in the selected answer—replacing the wire rope if more than three wires are broken in one strand—indicates a significant compromise in the rope's strength. Wire ropes consist of multiple strands, and each strand is made up of several individual wires. The strength and reliability of the rope depend on the structural integrity of these strands.

When more than three wires break in one strand, it suggests that the rope has experienced undue stress or damage, which increases the likelihood of complete failure during operation. Regular inspections are critical to ensure the safety of crane operations, as damaged or compromised wire ropes can lead to accidents.

The other conditions presented are also important indicators of potential issues with wire ropes, but they do not carry the same level of urgency for replacement. For example, a frayed strand (the first option) could indicate wear but may not necessitate immediate replacement unless it is severe. A rope being over ten years old (the third option) is a consideration for wear and should be evaluated based on usage and maintenance rather than an automatic replacement rule. The loss of color (the fourth option) typically reflects wear from environmental conditions but