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The Insulation Test (Insulation Resistance Test) is a test conducted to assess the condition of the insulation in an electrical system or equipment. Insulation materials must have sufficient resistance to prevent electrical current leakage between conductors or to the ground. This test is performed to determine whether the electrical insulation is in good condition and to prevent failures.

During the test, a specific DC voltage is applied, and the resistance of the insulation to electrical current is measured. A high resistance value indicates good insulation, while a low resistance value suggests weak insulation and a risk of leakage current.

The Megger Test is a test used to measure the insulation resistance of an electrical system or equipment. It is conducted to determine whether electrical current is leaking through the insulation material.

Named after the “Megger” brand, this test is actually a type of insulation test. However, over time, insulation testing devices have also come to be commonly referred to as “Megger.”