What is measured during insulation resistance testing?

During insulation resistance testing, what is primarily measured is the resistance of the insulation between conductors. This test is crucial for ensuring that the insulation is adequate to prevent leakage currents that could lead to equipment malfunctions or unsafe conditions. By applying a known test voltage between the conductors and measuring the resulting resistance, you can evaluate the effectiveness of the insulation material in both preventing electrical leakage and sustaining electrical integrity.

The emphasis on measuring insulation resistance helps identify any deterioration or damage in the insulation that could compromise safety. If the insulation resistance is low, it could indicate moisture ingress, material degradation, or physical damage, which warrants further investigation and potential remediation to ensure safe operation of electrical systems.