Before a new wire rope is threaded over a block sheave, what should a Qualified Electrical Worker check?

• A. The length of the rope
• B. The contour of the sheave matches the rope size
• C. The weight capacity of the block
• D. The age of the wire rope

Answer: (B)

Before threading a new wire rope over a block sheave, it is crucial for a Qualified Electrical Worker to check that the contour of the sheave matches the size of the rope. This is because a sheave that is not appropriately sized can cause excessive wear on the wire rope or lead to a failure during operation. The matching of contour ensures that the rope fits securely within the sheave, allowing it to function as intended without slipping or experiencing undue stress.

The other options, while they may have some relevance in other contexts, do not address the immediate need for compatibility between the rope and the sheave. Ensuring the sheave's contour is appropriate directly affects the safety and effectiveness of the lifting or rigging system, making it a priority for inspection.