Hey everyone, I'm replacing my old DC 24V shurflo well pump with a new Grundfos 15 SQ05-110. It's the 120V AC model.
Question: The Shurflo required 2 wire cable with no ground, the Grundfos has black/white/green. Can anyone think of a good reason why I should replace 100' of expensive submersible flat jacketed pump cable to swap out for wire with an EGC running to the pump? The well casing is grounded and from the well casing to the supply breaker there is an EGC. I'm struggling to think of a good reason why I should replace the wire, (besides of course something in the NEC like 110.3(B)! There's no shock hazard that I can really figure out - if the pump itself were to have a ground fault, the metal well casing would be a fault current path of way less resistance than anywhere else the water might happen to flow (plastic pipe)? I've heard some stories on the internet about how ungrounded well pumps shocked people when they were pulled up for servicing and testing, but...that sounds more like a Darwin award candidate than a real safety hazard. Well, curious to hear opinions on this. Thanks, Rebekah -- Tel: 336.266.8800 NABCEP Certified Solar PV Installation Professional™ 091209-85 NC Licensed Electrical Contractor
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