Author Topic: 3 wire pump w/o ground?  (Read 1002 times)


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3 wire pump w/o ground?
« on: October 11, 2021, 01:57:56 PM »
Can anyone tell if the attached picture is of an old 3 wire pump with no ground or a two wire pump with a ground. 

The pump/well has not been used for 20 years and the pump is probably over 30 years old.  All the components that were in the basement we’re torn out with a remodel 10 years ago and the house hooked up to county water.  We intend to use the well via existing yard hydrants for watering the garden, live stock and maybe a sprinkler system. 

Have purchased a csv and pressure tank am planning the installation.  Thought it was a 3 wire pump because the electrical supply had red, black, white and ground  supply wire but noticed the ground was just not attached to anything so now I am wondering what I’ve got.  Appreciate any help!!

Cary Austin

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Re: 3 wire pump w/o ground?
« Reply #1 on: October 12, 2021, 10:12:49 AM »
Can't tell by looking.  But with an ohm meter a three wire motor should show no short to ground on any of the three wires.  With a two wire motor one of the wires is a ground and will show 100% short to ground.