National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

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When should a wire rope be replaced if broken wires are detected?

  1. When 4 broken wires are found within 30 diameters

  2. When 3 broken wires are found within 6 diameters

  3. When broken wires exceed the specified limits

  4. Immediately after the first broken wire is found

The correct answer is: When broken wires exceed the specified limits

Wire rope is critical for the safe operation of cranes and lifting equipment, and its integrity directly affects the safety of lifting operations. The guideline for replacing a wire rope when broken wires are detected is primarily established to ensure that the rope can continue to function safely without a significant risk of failure. Selecting the correct answer emphasizes the importance of adhering to established safety limits for wire rope wear and damage. When broken wires exceed these specified limits, it signifies that the rope's strength and structural integrity are compromised. This can result in a sudden failure during operation, posing serious safety risks to operators, personnel, and nearby equipment. The criteria for inspection and replacement are derived from the wire rope manufacturer's recommendations and industry standards. These often take into account the size, type, and application of the wire rope, along with factors such as load management and operating conditions. Therefore, recognizing that a wire rope should be replaced when broken wires exceed defined safety limits ensures that safety precautions are followed and that the risk of accidents due to equipment failure is minimized.

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