How many visible broken wires in wire rope indicates it must not be used?

In wire rope inspection, the threshold for determining usability is based on the percentage of visible broken wires. If more than 10% of the total number of wires in a strand are found to be broken, it indicates significant damage and wear to the wire rope. This level of broken wires compromises the structural integrity and safety of the wire rope, making it unsuitable for use in applications where it will bear loads or provide support.

More than 10% broken wires suggest that the rope has reached a level of degradation that poses a safety risk. Therefore, it's essential to adhere to this guideline to ensure the safety of operations involving wire ropes in various settings, such as construction or lifting applications. Monitoring the condition of wire ropes is critical to prevent accidents and equipment failure, highlighting why the percentage of broken wires allowed is an important safety standard in construction and related fields.