Using a megger for hvac/r - Page 3
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  1. #27
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    4,214
    1000 volt is usually more than enough...i test ALL motors at 1000 VDC. yes, even 115VAC motors and they do just fine.
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  2. #28
    Join Date
    Jul 2005
    Posts
    5,292
    Quote Originally Posted by Lightning_Boy View Post
    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(
    That's a really nice meter. It would be overkill for most of us though. I have the AEMC 1026.

  3. #29
    Join Date
    Jan 2011
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    1,109
    Quote 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.
    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.

  4. #30
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    4,214
    Quote Originally Posted by KnewYork View Post
    Yeah, until you find one that the insulation is compromised...
    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.
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  5. #31
    Join Date
    Jan 2011
    Posts
    1,109
    Quote Originally Posted by JayGuy
    no damage is going to occur unless it was already there to begin with.
    Like Tom Petty says "you can believe what you want to believe..."

  6. #32
    Join Date
    Jun 2010
    Location
    Miami
    Posts
    257
    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.

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