Insulation Resistance Test Results

As part of the pre test procedure it will be necessary either to record the resistance of the test leads for subtraction from the overall measurement or use the auto null function a feature found on many instruments.

Insulation resistance test results.

The results obtained from ir test are not intended. A megger sends voltage through a cable and measures any current leakage in megohms 1 000 ohms. For low voltage installations i e. This is one factor that generates the continued popularity of analog testers.

Insulation resistance is temperature sensitive. The measured resistance indicates the condition of the insulation between two conductive parts. Insulation resistance decreases in temperature or moisture. Since 80 of electrical maintenance and testing.

What affects insulation resistance readings. 230v to measure insulation resistance in ohm s. How and where these two leads are connected will differ depending on what the test subject may be. Hands down without a doubt one of the most universally searched topics on ec m s website from a historical perspective is insulation resistance testing as a result some of our most popular evergreen articles like understanding insulation resistance testing continue to top the charts when it comes to most popular content.

As a production test this test is often used as a customer acceptance test with minimum insulation resistance per unit length often specified by the customer. With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative. The insulation resistance test is an electrical test which uses a certain type and level of voltage 500v d c. As you gain more skills you ll become familiar with this behavior and be able to make maximum use of it in evaluating your test results.

Generally two leads are connected into a circuit in order to carry out the test. Insulation resistance is calculated using an insulation resistance tester. Test instruments such as a multi meter should not be used as these are unable to generate sufficient current for the test. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Even when not required by the end customer many wire and cable manufacturers use the insulation resistance test to track their insulation manufacturing processes and. Megohmmeters or meggers are testing meters used to measure the current leakage from an electrical cable by means of administering an insulation resistance test.