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, …
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|