Insulation testers measure insulation resistance in cables, motors, electrical installations and equipment to help identify deterioration and potential faults. Choose instruments for installation testing, preventive maintenance and electrical troubleshooting.
Insulation Testers
About This Category
Electrical insulation can deteriorate over time due to heat, moisture, contamination, mechanical damage and ageing. Insulation testers apply a specified DC test voltage and measure the resulting insulation resistance, helping electricians and maintenance engineers assess the condition of cables, wiring, motors and electrical equipment.
Insulation resistance testing is widely used during electrical installation, commissioning, maintenance and fault diagnosis. Measurements can help identify damaged cable insulation, moisture ingress, deteriorating motor windings and other conditions that may lead to leakage current or electrical failure.
Test voltage is an important consideration when choosing an insulation resistance tester. Depending on the instrument, selectable test voltages may include 250 V, 500 V, 1000 V or higher values, allowing the tester to be used across different types of circuits and equipment. The appropriate voltage should always be selected for the installation and equipment being tested.
Digital insulation testers can provide features such as automatic ranging, data hold, continuity measurement and additional electrical measurements, while analogue instruments offer a straightforward visual indication of insulation resistance. Measurement range, available test voltages, accuracy and the required test functions should therefore be considered when comparing models.
Insulation testing forms part of broader electrical installation and maintenance work. Browse our electrical testers for additional instruments used to test, inspect and troubleshoot electrical systems.
