I understand your parallel neutral dilemma, what they did never should have occurred. If you ever end up with a open neutral, someone could get hurt or worse.
Well to end this I'm not doing the job .. I've decided to walk away. I need 125 feet of trench thru a solid rock shelf to get to the pump location. Im not even sure if I can find a trench contractor that would fool with it. I don't need the head ache and jobs like this seem to always turn out to be a mistake if you take them on. Besides I'm retired I need the easy stuff ...
I briefly told the owner about the issue we have been discussing but I didn't get his attentiuon I don't think. Maybe he will call the county out to look ..hard to say. Sometimes you just have to move on.
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(correction) If it is a "special purpose" circuit, namely not having any "standard" light fixtures or 15 amp or 20 amp receptacles, then it can be more than 20 amps, and without a subpanel and grounding electrode system where it gets to the outbuilding.
Note that the outbuilding may receive only one feed. If you run a special purpose circuit of more than 20 amps, say, for some heavy machinery, then you may not also run a general purpose circuit for lights, etc. This is why you need the subpanel and GES, receiving the single circuit (usually a 120/240 volt circuit aka multiwire branch circuit) with adequate ampacity for both the special purpose loads and general purpose loads.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.