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Old 06-19-2016, 02:04 PM   #1
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Default Testing submersible pump motor

So I have a megger but this is my first use outside of uf cable, what's the best way to check our little giant submersible pump? I read from the hot to ground wire but wanted to make sure I am doing it right before I condemn it to the dump

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Old 06-19-2016, 02:22 PM   #2
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They were to small to bother with. Check the impeller to see if it's stuck.
If it tripped your gfi, toss it.
I had a fish pond for 25 years, until this year.
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Old 06-19-2016, 02:29 PM   #3
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It may be my problem, I'm not so much concerned with the pump as confirming that it was the problem so that I can avoid a second work order. There were a few other variables that may have caused my issue as well. That would be the right way to read it right? It's really a sump pump they were using to fire the fountain
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Old 06-19-2016, 03:13 PM   #4
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Yep, hot to ground.
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Old 06-19-2016, 04:47 PM   #5
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Quote:
Originally Posted by Anathera View Post
It may be my problem, I'm not so much concerned with the pump as confirming that it was the problem so that I can avoid a second work order. There were a few other variables that may have caused my issue as well. That would be the right way to read it right? It's really a sump pump they were using to fire the fountain
If it was just a sump pump, it's duty cycle wasn't continuous I'm sure..
Little giant has some good pumps for running a fountain.
My pond pumps lasted about 5 years. I ran them 24/7 to keep the water aerated the fish.. I liked the sound of the water fall at night.
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Old 06-19-2016, 05:53 PM   #6
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Quote:
Originally Posted by Wirenuting View Post
If it was just a sump pump, it's duty cycle wasn't continuous I'm sure..
Little giant has some good pumps for running a fountain.
My pond pumps lasted about 5 years. I ran them 24/7 to keep the water aerated the fish.. I liked the sound of the water fall at night.
Even the stainless body pumps with a continuous duty cycle are hit or miss for more than three years straight. They sure don't build them like they used to just 15-20 years ago.
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Old 06-20-2016, 09:11 AM   #7
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2-Wire Circuit?

Black to White
White to Ground
Black to Ground
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Old 06-20-2016, 09:33 AM   #8
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I've had the worst luck megging large submersibles?

I just did one a week ago, 125HP 480v, it megged .7 megaohms at 1000v, even after letting it test for 2 minutes to build the voltage up.

I closed the pump panel door, made sure the latches were tight, turned my head and pressed start. It ran. This is the second large submersible I can remember that I should of been able to condemn with my megger, that ran fine. I don't get it.

For regular motors, I usually tell customers anything below 25-50 megaohms is on it's way out, but these submersibles still seem able to run when they are almost shorted?
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Old 06-20-2016, 06:48 PM   #9
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Mine read bad too yet 9/10 it ran just fine. It had been in service two years in a heavily chlorinated pool though
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Old 06-20-2016, 08:59 PM   #10
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Quote:
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2-Wire Circuit?

Black to White
White to Ground
Black to Ground
The pump..
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Old 06-20-2016, 09:44 PM   #11
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The pump..
Sure if it is a 3-wire Black to white had better be a dead short or there's the issue.

To be honest I forgot he was meggering a pump, I was thinking the branch circuit wiring to a JB for the pump.
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