Insulation Resistance Test Standard Values

Also acceptable values of insulation resistance depend upon the equipment you re testing.

Insulation resistance test standard values.

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 insulation resistance test consists in measuring the insulation resistance of a. One meg ohm rule for ir value for equipment. Based upon equipment rating.

As per ie rules 1956. Curve b shows same values corrected to 20 c see page 22 giving a definite downward. The insulation resistance test is the second test required by the electrical safety testing standards. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.

Curve a shows test values as measured. 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. One meg ohm rule for ir value for equipment.

As per ie rules 1956. 3 shows a typical scale which reads increasing resistance values from left up to infinity or a resistance too high to be measured. Figure 4 typical record of insulation resistance of a mill motor. 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.

The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and. Use these values in the absence of consensus standards dealing with insulation resistance tests.