Why is a torque wrench necessary when tightening bolted joints of copper bus bars?

Using a torque wrench when tightening bolted joints of copper bus bars is essential to ensure the joints are securely tightened. Proper torque application is critical in electrical installations because it directly affects the electrical and mechanical integrity of the connection.

If the bolts are not tightened to the specified torque, it can lead to loose connections, which may result in increased resistance at the joint. This increased resistance can cause excessive heat generation, potentially leading to overheating, failure of the joint, or even fire hazards. Additionally, securely tightening the bolts helps maintain a consistent contact pressure throughout the surface of the bus bars, ensuring effective electrical conduction.

While the other options touch on important aspects of installation, they do not capture the primary reason for utilizing a torque wrench in this context. Preventing heating, reducing corrosion, and facilitating adjustment are secondary benefits that may be influenced by proper tightening but are not the primary purpose of using a torque wrench in relation to bolted joints. The main focus remains on achieving a reliably secure connection that meets safety and operational standards.