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.

Insulation resistance test standard values.

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. Curve a shows test values as measured. As per ie rules 1956.

Figure 4 typical record of insulation resistance of a mill motor. 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. 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 insulation resistance test is the second test required by the electrical safety testing standards.

Use these values in the absence of consensus standards dealing with insulation resistance tests. One meg ohm rule for ir value for equipment. One meg ohm rule for ir value for equipment. Curve b shows same values corrected to 20 c see page 22 giving a definite downward.

Also acceptable values of insulation resistance depend upon the equipment you re testing. 1k v 1 mω minimum 1kv 1 mω 1kv. Based upon equipment rating. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.

The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and. 3 shows a typical scale which reads increasing resistance values from left up to infinity or a resistance too high to be measured.