Insulation Resistance Test Procedure Megger

This meter is of special.

Insulation resistance test procedure megger.

Perform insulation resistance test on each conductor with respect to ground and adjacent conductors. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. For good insulation the resistance usually reads in the megohm range. Insulation resistance testing is a non destructive test procedure.

Insulation resistance quality of an electrical system degrades with time environment condition i e. Temperature humidity moisture and dust particles. This meter is of special construction with both current and voltage coils enabling true ohms to be read directly independent of the actual voltage applied. Types of insulation resistance tests short time or spot reading test.

The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. To test a cable with a megger you connect one probe to the outside of the cable and with the power turned off you touch the probe to the conducting wire at the point of connection. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. A megger is an ohmmeter that measures resistance in the megohm scale.

The megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation. For cables 300 volt use 500 vdc megger. For good insulation the resistance usually reads in the megohm range. For cables above and less than 1200 volt use 2500 volt megger.

It s also known as an insulation tester. If you are testing insulation resistance to ground place the positive probe on the ground wire or the grounded metal junction box and the negative probe on the conductor or terminal. Continue with this testing procedure until you have values for all the spaces of your table. Read the value of the resistance at the end of the minute test and note it in your table.

For cables above 300 volt to 600 volt use 1000 volt megger. Procedure for continuity and insulation resistance testing. Insulation resistance testing purpose. Perform megger test on each cable with respect to ground and adjacent cables.

The insulation resistance test a k a the megger test is as relevant as ever and in many applications is preferred to other insulation test methods. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. In conclusion a multimeter measures the electrical resistance of a conductor coil while a megger measures the insulation resistance of an isolated group two coils relative to mass something that a multimeter is unable to do. The test measures the insu lation resistance between the phases and or between phase and ground.

Energize the megger for 1 minute.