How to Properly Set Torque Wrench for Mechanical Lug Tightening

How can you ensure that you are meeting the manufacturer's specifications when tightening mechanical lugs?

Based on the information provided, what is the correct torque setting in pound-inches (lb-in) for the torque wrench?

Answer:

The correct torque setting in pound-inches (lb-in) for the torque wrench is option e. 132 lb-in.

When final-tightening the mechanical lugs that connect feeder conductors to a 600-amp safety switch, it is essential to set the torque wrench correctly to meet the manufacturer's specifications. The instruction label on the safety switch indicates a torque of "11 lb-ft," which needs to be converted to pound-inches for the torque wrench.

In physics and mechanics, torque is the rotational equivalent of linear force and is crucial in ensuring proper tightening without causing damage. In this case, the conversion from pound-feet (lb-ft) to pound-inches (lb-in) is necessary. Since 1 pound-foot is equal to 12 pound-inches, the torque value of "11 lb-ft" translates to 132 lb-in for the torque wrench setting to meet the manufacturer's specifications.

By setting the torque wrench at 132 lb-in, you can ensure that you are applying the recommended torque to the mechanical lugs, thus ensuring secure connections and adherence to safety standards. Proper torque application is vital in electrical installations to prevent issues such as loose connections or damage to equipment.