The ground pin of the swamp cooler water pump A/C plug pulled out when I
unplugged it to lubricate it for the summer so I have to buy a replacement
plug. Being cheap, I deeply regret this expense.
My reason for posting: Why would this pump need a ground? It's plastic
covered so no personal shock danger. Probably because it operates in such a
wet environment. But still, what is it protecting? I'm stupid, obviously.
You mean the pump becomes defective, shorts to the water flow, which
carries the electric current to the cabinet, which is then is dangerous
to touch? Maybe. But I'd think the cabinet would be grounded elsewhere,
perhaps though the blower? Might be interesting to check that with an
May be, but perhaps it's mounted w/ isolating feet to minimize
noise/vibration??? Who knows w/o looking/more detail?
But, my guess is that it was an off-the-shelf production pump and it was
simpler to just use the supplied 3-prong plug than rewire it and cheaper
than specifying a built-to-purpose pump.
It may be there's a UL (or similar) listing requirement that the motor
has to be grounded anyway even if it is direct mounted to the frame just
to protect against the possibility of that ground connection via the
mounting bolts being violated.
There may be metal parts inside which should be grounded. A short to
those metal parts could conduct electricity to the water or the plastic
exterior if wet.
In addition to the pump being grounded, you would also want the fan
motor and metal case grounded.
The more things which are grounded, the safer for you and your family!
(And anyone who touches a metal vent... Roof vent connects to house
vents, house vents connect to floor heating return vents, kid crawls up
to wall and touches floor vent - ZAP!)
Buy the proper plug!
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