250.112 - Whaa?

[George Stolz]

I'm sitting here trying to explain the reason for 250.110 and 250.112's existence. Any pointers? :huh:

In general, it just seems really random.

Further, 250.112(L) in the handbook has the following commentary:

The requirement of 250.112(L) is intended to reduce stray
voltages and minimize shock hazard during maintenance,
when the pump is removed from the well casing and tested.
During normal operation, a ground fault to the casing of a
water pump can be a shock hazard if exposed or it could
energize a metal well casing if the pump is a submersible
type.

Are people really pulling out these pumps while they are energized and pumping to perform testing on them? :blink:

Any insight would be great. TIA

 

[ramsy]

If industry practice often used well casings as energized return paths, perhaps 250.112(L) is clarifying this illegality and a liability, which could also explain why my State prohibits any license from working on wells, unless specifically registered as a Water Well Drilling Contractor