Our local utility provided a product which came up short. One of three phases was missing. Well I lost a few motors, (poor OL selection), but thats not what my questions about... I have never tested a submerged motor such a well pump with a megger, I followed normal motor testing procedures and the motor megged bad, ( ground on each phase), I confirmed findings with 2 meggers, (Fluke, and real Megger). I also noted that the OL didn't trip, so I don't know if this motor was running at the time. The motor was run tested, (against my judgement), and ran... I was surprised CB didn't trip, yet I treat every day as a learning experience, and desire to learn why this motor submerged in water failed the megger check. I am guessing that submerged in water has quite a bit to to with it but desire any comments, help or suggestions to provide a better testing procedure as I have 4 well pumps total and will surly test one of them again...
Motor Testing for a Wellpump
- Thread starter VinceS
- Start date
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Since your pump was still in the well maybe the cable was the culprit not the motor. What was your meggar reading?
I assume the pump was still in the well for the run test, how did the current look?
You cannot reliably depend on your OL to protect against single-phasing.
I assume the pump was still in the well for the run test, how did the current look?
You cannot reliably depend on your OL to protect against single-phasing.
ptonsparky
Tom
- Occupation
- EC - retired
Franklin Pump lists insulation values for a motor & drop cable in well, as good condition at .5 to 2 meg. Considerably less than what some would condemn at 20 meg.
New at 2 meg and replace at less than .5 meg.
New at 2 meg and replace at less than .5 meg.
zog
Senior Member
- Location
- Charlotte, NC
Get the NETA MTS, it contains detailed motor testing procedures (and cable) along with recommended testing intervals.
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