Insulation resistance testing purpose.
Cable insulation test using megger.
The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator.
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.
It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs.
Applied potential shall be 500 volts dc for 300 volt rated cable and 1000 volts dc.
For cables 300 volt use 500 vdc megger.
Testing electrical cable with a megohmmeter helps identify damage in the cable insulation.
De energize and discharge the circuit completely before connecting a megger.
Cable testing and diagnostics provides information about the cable s global condition e g.
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 test measures the insu lation resistance between the phases and or between phase and ground.
The megger insulation tester is essentially a high range resistance meter.
The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.
The first dc portable insulation tester was developed in 1889 by our founders sydney evershed and ernest vignoles and by 1903 was being sold as a megger insulation tester.
The insulation condition from values that are only relative.
It s also known as an insulation tester.
Insulation resistance testing is a non destructive test procedure.
For good insulation the resistance usually reads in the megohm range.
It will also reveal localised weak spots in the insulation.
For cables above and less than 1200 volt use 2500 volt megger.
Use megger on high resistance measurements only such as insulation measurements or to check two separate conductors on a cable.
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.
For good insulation the resistance usually reads in the megohm range.
Cable testing and diagnostics.
A megger is an ohmmeter that measures resistance in the megohm scale.
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.
