What is the primary use of a megger in electrical work?

The primary use of a megger in electrical work is to measure insulation resistance, which is crucial for ensuring that electrical systems are safe and functioning properly. A megger, or insulation resistance tester, applies a high DC voltage to the insulation of conductors and other electrical components. By measuring the resistance of the insulation, it enables technicians to determine whether the insulation is deteriorating or has faults that could allow current to leak to the ground or cause short circuits. High insulation resistance values indicate healthy insulation, while low values can signal potential hazards, helping to prevent electrical failures and improve safety in electrical installations.

Other options do not represent the megger’s main function. Measuring voltage or current flow typically involves devices like voltmeters or ammeters, while providing power to a circuit is the role of a power source or generator, not a megger. The specific capability of the megger to assess insulation integrity sets it apart, making it an essential tool in troubleshooting and maintaining electrical systems.