Cable Insulation Resistance Test Values

Developed early in the 20th century the insulation resistance ir test is the oldest and most widely used test for assessing the quality of insulation.

Cable insulation resistance test values.

Since 80 of electrical maintenance and testing. Ansi neta mts 2015 table 100 11 insulation resistance test values rotating machinery for one minute at 40 c. Acceptance testing cable and busway circuit breakers codes and standards ieee. If during periodical testing insulation resistance of cable is found between 5 and 1 mω km at buried temperature the subject cable should be programmed for replacement.

Values based on ieee std 43 2013. The insulation resistance test consists in measuring the insulation resistance of a. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. 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.

If during periodical testing insulation resistance of cable is found between 5 and 1 mω km at buried temperature the subject cable should be programmed for replacement. The insulation resistance test is the second test required by the electrical safety testing standards. If insulation resistance of the cable is found between 1000 and 100 kω km at buried temperature the subject cable should be replaced urgently within a year.