Using a megger for hvac/r

1000 volt is usually more than enough...i test ALL motors at 1000 VDC. yes, even 115VAC motors and they do just fine.

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Originally Posted by Lightning_Boy

I currently don't work on anything bigger than 460/480v.
Is it worth getting a 5000v capable meg ohmmeter ?
Really liking the AEMC stuff. 1050 model has my attention but not my budget :0(

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That's a really nice meter. It would be overkill for most of us though. I have the AEMC 1026.

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Originally Posted by JayGuy

1000 volt is usually more than enough...i test ALL motors at 1000 VDC. yes, even 115VAC motors and they do just fine.

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Yeah, until you find one that the insulation is compromised. Industry standard for DC test voltages of 120-
240 VAC motors is 500 VDC. Certainly you can continue juicing those little motors to 1000 VDC until your luck runs out.

The manufacturers of 4160 V motors prefer a continuous application (10 minutes) of approximately 2500 VDC rather than shorter durations of 5000 VDC.

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Originally Posted by KnewYork

Yeah, until you find one that the insulation is compromised...

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that's the goal. at 2mA DC of maximum current, lightning bugs have more power in their butts than a megger. no damage is going to occur unless it was already there to begin with.

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Originally Posted by JayGuy

no damage is going to occur unless it was already there to begin with.

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Like Tom Petty says "you can believe what you want to believe..."

There is a reason why there are megger tests....and then they are hi-pot tests.

A megger test is supposed to be non-destructive. Every insulation class has a rating. We are supposed to be protecting investments, not harming them.