What type of test involves using a separate voltmeter, ammeter, and power supply to measure grounding system resistance?

The type of test that involves using a separate voltmeter, ammeter, and power supply to measure the resistance of a grounding system is known as an earth resistance test. This test is essential for determining how well the grounding system is functioning, which ensures safety and proper operation of electrical systems.

During an earth resistance test, a known current is passed through the grounding system, and the resulting voltage drop is measured. By using Ohm's law (voltage = current × resistance), the resistance of the grounding system can be accurately calculated. This method provides a direct measurement of how effectively the grounding system can carry fault currents, which is crucial for preventing electrical shocks and equipment damage.

This is distinct from other testing methods. A leakage current test focuses on detecting unwanted currents that may flow to the ground but does not specifically measure the grounding resistance. A voltage drop test checks for voltage differences across a circuit under load conditions, rather than the resistance of the grounding system itself. A continuity test is designed to verify that a circuit is complete and that there are no breaks, rather than measuring resistance. Therefore, the earth resistance test is the method specifically designed to assess the effectiveness of grounding systems.