Cable Megger Test Insulation Resistance Values Table

The megger insulation tester is essentially a high range resistance meter ohmmeter with a built in direct current generator.

Cable megger test insulation resistance values table.

If the cable does not pass if a cable does not pass the test the cable still may be good but additional cable evaluation should be per formed. One meg ohm rule for ir value for equipment. Curve a shows test values as measured. Values based on ieee std 43 2013.

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. Electric heat tracing systems are widely used inprocessindustriesand have applications in many other areas as well. Ansi neta mts 2015 table 100 11 insulation resistance test values rotating machinery for one minute at 40 c. Reverse side of card at right is used to record the test data.

Insulation resistance testing of heat trace cable. It s also known as an insulation tester. For good insulation the resistance usually reads in the megohm range. B kv is the rated machine terminal to terminal voltage.

1k v 1 mω minimum 1kv 1 mω 1kv. Figure 4 typical record of insulation resistance of a mill motor. Comparing this result with the correct row of table 2 shows that our cable passes the insulation resistance test. 2621 van buren avenue.

In general these systems are used to maintain a preferred temperature. 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. Insulation resistance testing of heat trace cable. The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Based upon equipment rating. The first thing to check is the cable testing environment and cable preparation. A megger is an ohmmeter that measures resistance in the megohm scale. As per ie rules 1956.

At a pressure of 1000 v applied between each live conductor and earth for a period of one minute the insulation resistance of hv installations shall be at least 1 mega ohm or as specified by the bureau of indian standards. A rated line to line voltage for three phase ac machines line to ground voltage for single phase machines and rated direct voltage for dc machines or field windings. Figure 3 typical scale on the megger insulation tester. 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.