What tool would you use to test for leakage resistance to ground?

The correct tool for testing leakage resistance to ground is a Megger. A Megger, or insulation resistance tester, is specifically designed to generate a high test voltage (typically in the range of hundreds to thousands of volts) to measure the insulation resistance of electrical equipment, such as motors and generators, as well as wiring and cables. This high voltage helps identify insulation breakdowns and leakage paths to ground that may not be detectable with standard voltage testing equipment.

When testing for leakage resistance, the Megger provides a clear and accurate reading of the resistance, which indicates how well the insulation is performing. A low resistance reading can signal potential insulation failure, which can lead to ground faults that pose safety risks and equipment damage.

Using a multimeter, while versatile for various electrical measurements, does not typically apply the necessary high voltage to effectively test insulation resistance. A clamp meter is primarily used for measuring current without direct contact to the circuit, making it unsuitable for resistance testing. A voltage tester is designed to check for the presence of voltage rather than measure resistance, and it lacks the capability to provide the high voltage necessary for insulation testing. Therefore, the Megger stands out as the appropriate tool for verifying leakage resistance to ground effectively.