I have a 600 ft well and submersible pump in a mountain home at 9500 ft elevation prone to lightning storms. I typically have to replace the ‘pump protector’ relay (i.e., protects pump from either high or low amps, e.g., dry well) at least annually. I’m almost certain the failures are due to lightning strikes nearby. But my home has lightning rods, whole-house surge protector, and most failures have occurred when pump is not running or even the incoming power disconnect has been turned off. So I think the power surge which is frying the protective relay is backfeeding from the well. I’m considering installing an isolation contactor inbetween the pumpprotector relay and wiring going to pump. Does anyone have a better solution or know of a reason to not install the isolation contactor on all three wires?
Electrical – How to protect sumbersible pump ‘pumpsaver’ device
electricallightningpump
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Best Answer
If you are using copper water line to the well just make sure the pipe is bonded to the well casing and your house electrical ground. If it's plastic water line than you might want to bury a #6 bare copper bonding jumper and connect it to the house ground to equalize the potential between the two grounds.