What is a megger used for?

A megger, or insulation resistance tester, is specifically designed to measure the insulation resistance of electrical wiring and equipment. This tool applies a high voltage - typically in the range of 250 to 1000 volts - to the insulation of wires and components, allowing users to assess the quality and integrity of the insulation. The insulation's resistance to electrical flow in relation to the ground is crucial for preventing short circuits, electrical leaks, and ensuring overall safety.

The importance of testing insulation is underscored in environments where moisture, chemicals, or extreme temperatures might degrade insulation quality over time, posing significant risks in electrical systems. Therefore, option C accurately describes the primary function of a megger.