Insulation Resistance Test Standard Values

One meg ohm rule for ir value for equipment.

Insulation resistance test standard values.

Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv. Insulation resistance test values the insulation resistance values on this page are based off of representative values suggested by the neta standards review council. The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and. As per ie rules 1956.

Use these values in the absence of consensus standards dealing with insulation resistance tests. Also acceptable values of insulation resistance depend upon the equipment you re testing. 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. 1k v 1 mω minimum 1kv 1 mω 1kv.

1k v 1 mω minimum 1kv 1 mω 1kv. Curve a shows test values as measured. The insulation resistance test consists in measuring the insulation resistance of a. Based upon equipment rating.

3 shows a typical scale which reads increasing resistance values from left up to infinity or a resistance too high to be measured. Curve b shows same values corrected to 20 c see page 22 giving a definite downward. One meg ohm rule for ir value for equipment. Figure 4 typical record of insulation resistance of a mill motor.

The insulation resistance test is the second test required by the electrical safety testing standards. 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.