In electrical safety testing, which test evaluates insulation resistance?

The insulation resistance test is specifically designed to evaluate the effectiveness of the insulation in electrical devices and equipment. This test measures the resistance between live conductive parts and the grounded parts of equipment, ensuring that there is adequate insulation to prevent electric shock or short circuits.

By applying a specific voltage across the insulation and measuring the resulting current, technicians can determine if the insulation is compromised. A high resistance value indicates good insulation, while a low value may signify insulation breakdown, which could lead to safety hazards.

Other tests mentioned, such as grounding tests and dielectric strength tests, serve different purposes. Grounding tests verify that the grounding system is intact and capable of directing unwanted electrical current safely into the ground. The line isolation test assesses whether the live circuitry is properly isolated from other conductive parts of the system. However, these tests do not specifically measure the quality of insulation, making the insulation resistance test the most suitable choice for evaluating insulation integrity.