When should rotation resistant wire rope used as a host line on a boom truck be replaced?

Rotation resistant wire rope is designed to minimize twisting and other forms of movement during lifting operations. To maintain safety and functionality, it is crucial to regularly inspect and determine the appropriate time for replacement based on the condition of the rope.

The guideline of replacing the wire rope after observing two broken wires within six rope diameters is significant because it indicates that the integrity of the rope is compromised. Broken wires reduce the overall strength and reliability of the rope, increasing the risk of failure during operation, especially under heavy loads. Compliance with this standard helps ensure the safety of personnel and equipment.

While the other options might suggest replacement at different thresholds of broken wires or signs of wear, two broken wires in a specific length is a more conservative and practical measure that aligns with industry best practices for maintaining safe operational standards. This criterion is intended to prevent failures that could arise from unexpected stresses on the wire rope, particularly in challenging working environments.