What does an insulation resistance test measure?

The insulation resistance test specifically measures the resistance of the insulation in motor windings. This test is crucial for determining the effectiveness of the insulation material that separates the conductive parts of the motor from each other and from the earth. High insulation resistance is essential to prevent electrical leakage and current flow that could lead to short circuits, equipment damage, or safety hazards.

By measuring this resistance, technicians can assess the condition of the motor's insulation, identifying potential deterioration or breakdown that may not be visible through visual inspection alone. This helps in ensuring the longevity and reliability of the motor in operation.

Understanding insulation resistance is fundamental in maintenance and testing practices, as it directly correlates with the safety and performance of electrical machinery.