Cable Insulation Test Using Megger

Routine megger tests of aged electrical cable is a prudent way to ensure your circuits are safe from arc faults that can cause circuits to be blown and safe.

Cable insulation test using megger.

For cables 300 volt use 500 vdc megger. The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator. De energize and discharge the circuit completely before connecting a megger. The test measures the insu lation resistance between the phases and or between phase and ground.

It s also known as an insulation tester. It will also reveal localised weak spots in the insulation. Insulation resistance testing is a non destructive test procedure. For good insulation the resistance usually reads in the megohm range.

For cables above 300 volt to 600 volt use 1000 volt megger. Insulation resistance testing purpose. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. 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.

Applied potential shall be 500 volts dc for 300 volt rated cable and 1000 volts dc. The insulation condition from values that are only relative. Cable testing and diagnostics. Testing electrical cable with a megohmmeter helps identify damage in the cable insulation.

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Perform insulation resistance test on each conductor with respect to ground and adjacent conductors. Never touch the test leads while the handle is being cranked. For cables above and less than 1200 volt use 2500 volt megger.

It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. A megger is an ohmmeter that measures resistance in the megohm scale. For good insulation the resistance usually reads in the megohm range. Use megger on high resistance measurements only such as insulation measurements or to check two separate conductors on a cable.

A megger sends voltage through a cable and measures any current leakage in megohms 1 000 ohms. The cable s overall insulation system and will reveal localised problems such as poor joints and terminations. The megger insulation tester is essentially a high range resistance meter.