Under OSHA regulations, what is the maximum percentage of visible broken wires allowed in a wire rope sling before it is deemed unsafe?

The correct answer reflects that under OSHA regulations, a wire rope sling is deemed unsafe when it shows more than 10% of visible broken wires. This standard is established to ensure that the integrity of the sling is maintained. Wire ropes are designed to perform under specific loads, and the presence of broken wires can significantly reduce their strength and increase the risk of failure during lifting operations.

The 10% threshold is based on extensive testing and safety assessments, which indicate that even a small percentage of broken wires can compromise the rope's load-bearing capability. Therefore, if visual inspections reveal that more than 10% of the wires are broken, the sling must be taken out of service to prevent accidents and ensure safety in lifting operations. This standard is part of a broader commitment to worker safety and equipment reliability on construction sites.