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

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According to OSHA specifications, how many randomly distributed broken wires in rotation-resistant rope are cause for replacement of the rope?

  1. 1 broken wire in 6 rope diameters

  2. 2 broken wires in 30 rope diameters

  3. 3 broken wires in one strand in one lay

  4. 2 broken wires in 6 rope diameters

The correct answer is: 2 broken wires in 6 rope diameters

The correct answer regarding the OSHA specifications for the replacement of rotation-resistant rope is based on established criteria for assessing the integrity of such ropes. Specifically, if there are two broken wires found within a single lay of the rope, this is considered a standard threshold for determining whether the rope needs to be replaced. This regulation is crucial for ensuring safety and reliability in crane operations, as the presence of broken wires can significantly weaken the rope and increase the risk of failure during use. To provide further context, the other options do not align with the OSHA standards. For instance, a guideline suggesting only one broken wire in six rope diameters or two broken wires in thirty diameters is less stringent and may not adequately ensure the rope's safety. Similarly, stating three broken wires in one strand is a more conservative measure, but OSHA specifically addresses two broken wires as the key threshold for replacement in the context of rotation-resistant ropes. Hence, the focus on two broken wires in six rope diameters aligns with industry best practices for maintaining the structural integrity of crane cables and ensuring operational safety.

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