Insulation Test | Insulation Resistance Test | Insulation with Fluke Multifunction Meter
Insulation Test
Segregation and insulation test
An insulation resistance (IR) test measures the total resistance between any two points separated by electrical insulation. The test, therefore, determines how effective the dielectric (insulation) is in resisting the flow of electrical current.
Such tests are useful for checking the quality of insulation, not only when a product is first manufactured but also over time as the product is used.
Performing such tests at regular time intervals can detect impending insulation failures before they occur and prevent user accidents or costly product repairs.
Method”
1. The test instrument must be able to produce 500V D.c when loaded to 1 mA ,And capable of measurement of up to 200Moham
2. For LV sytem insulation range is .5Moham if we get more means having good insulation on 500DC v and .25Moham is for SELV system on 250D.c V
3. Switch off the main breaker and disconnect all the appliances
4. Check the resistance between all live conductors
5. Between live and earth and between earth and neutral
6. Take one piece of cable and make one loop in main cable as you see and connect the neutral and earth bar with that loop also ,the only open one cable which you want to test and connect owith one probe of meter and 2nd probe of meter contted with that loop and inject the D.V volt if you get .5M ohm means our cable is ok if did not get then it means need to check that cable..
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