Maybe I should clarify here that the wire type switches at the well head, and that is the point at which the metal well casing is bonded to the EGC running with the current carrying conductors to the supply circuit 20A breaker.
On Wed, Apr 26, 2017 at 7:09 PM, Rebekah Hren <rebekah.h...@gmail.com> wrote: > 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 > -- Tel: 336.266.8800 NABCEP Certified Solar PV Installation Professional™ 091209-85 NC Licensed Electrical Contractor
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