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You normally use 2x the rated voltage for megger testing If your megging a few branch circuit or mcc feeders, a standard ohmeter should be fine. A 240v motor would be tested at 500v, not 1000v
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What should the ohms be going from ground to phase on a digital megger Success, the megger is used to measure the integrity of insulation on mostly motor windings For a good motor should it read around what (400megaohms)
When the motor is bad it should read 0 ohms to ground
Megger readings that do not stabilize, but fluctuate are indicative of moisture in or on the conductors and should be investigated Sometimes this reading will continue to climb as the moisture evaporates due to the test voltage When meggering one must be careful with the voltage levels you are trying to prevent future electrical damage to. From what i've read here, it seems most like the fluke 1507/1589
The only knock on those flukes are their inability to do accurate pi/dar tests Type in megger in the search function and you'll find all kinds of info. I've never seen anyone hipot 600v cables A megger is a megohmeter, measures insulation resistance
A hipot tester basically works the same way, but measures leakage current
If you see a fault with the megger, you will see a fault with the hipot The hipot stresses the insulation weak points at higher voltage levels than the megger will I don't think the hi pot will do anything for you. I have looked through a bunch of posts regarding megger testing and not seeing what i am looking for
I am looking for a “standard” that says this xx mω reading is a “pass” and this xx mω reading is a “fail” I am sure it is an ieee standard, but i do not know for sure I have a couple pages. Well thanks for the reply, the test that you mention using the megger on the test with the pump aqnd pimp wiring
Spot test, time resistance test since there is no formal data i guess both these would be a good idea
And then a ohm check on the windings them selfs Which someone kindly gave me those numbers.thankyou so if im finding bad readings at the vfd end ( testing pump and pump wiring.
