What is Megger testing of a motor?

Megger testing is an electrical test of insulation performance in an electrical apparatus. A mega-ohm meter is applied to each phase connection for the motor leads and ground, and a voltage applied. … Megger testing measures resistance between the phase windings of the motor under test and ground.

What is the acceptable megger reading for a motor?

The rule may be stated: Insulation resistance should be approximately one megohm for each 1,000 volts of operating voltage, with a minimum value of one megohm. For example, a motor rated at 2,400 volts should have a minimum insulation resistance of 2.4 megohms.

What is considered a bad Megger reading?

Turn on and read the meter. Anything reading between 2 megohms and 1000 megohms is usually considered a good reading, unless other problems have been noted. Anything less than 2 megohms indicates an insulation problem.

Can a Megger kill you?

Usual megger voltage is 500 V, and our body resistance can be 1 M or little less. This means a maximum current of 1 mA or bit more, which is not safe, though not fatal (If we don’t count meter resistance).

What is a bad insulation resistance reading?

The purpose of the IR test is to check for damaged insulation, this can be mechanical damage or damage by heat, (overloaded cables), readings less than 2 Mohm indicate damaged insulation, readings of 2-50 Mohm are indicative of long circuit lengths, moisture and contamination and do not indicate the insulation quality, …

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What is difference between megger and multimeter?

MULTIMETER : 1. multi meter is used to measure resistance. … megger is used to measure the insulation resistance only.

How much does a megger cost?

All Megger Products

1000-434 Megger 1000-434 Dual Clamp Calibration and Spacing PCB MSRP $135.00 Sale $107.28
1004-449 Megger 1004-449 Lead Set, CAT IV 600V, 10 m, for DLRO100 Series $1,100.00
1004-450 Megger 1004-450 Lead Set, CAT IV 600V, 15 m, for DLRO100 Series $1,545.00
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