Wire rope on hoists shall be taken out of service when wear of more than one third of the original diameter of outside individual wires exists.

Wire rope used in hoists is subject to significant wear and tear due to the stresses and strains placed upon it during operation. The safety and integrity of hoisting systems are paramount, and maintaining the wire rope in good condition is critical to preventing accidents and injuries.

The statement indicates that wire rope needs to be taken out of service when more than one-third of the original diameter of the outside individual wires is worn down. This guideline is based on established safety standards and practices, which aim to ensure that the wire rope retains sufficient strength and structural integrity to perform its intended function without risk.

When individual wires lose more than one-third of their original diameter, the remaining material may not adequately handle the loads required, leading to a potentially catastrophic failure. Taking the wire rope out of service at this point is a precaution that helps maintain a safe working environment and reduce the likelihood of accidents. This adherence to safety standards protects workers and equipment, making the practice essential in hoisting operations.