Insulation Resistance Test Standard Values

Based upon equipment rating.

Insulation resistance test standard values.

Curve a shows test values as measured. Also acceptable values of insulation resistance depend upon the equipment you re testing. The insulation resistance test consists in measuring the insulation resistance of a. Based upon equipment rating.

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. 1k v 1 mω minimum 1kv 1 mω 1kv. One meg ohm rule for ir value for equipment.

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. One meg ohm rule for ir value for equipment. 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.

As per ie rules 1956. Use these values in the absence of consensus standards dealing with insulation resistance tests. Curve b shows same values corrected to 20 c see page 22 giving a definite downward. 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. 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.