On 18 Mar 2013 18:06:25 GMT, KenK wrote:

Oren wrote in
:

On 18 Mar 2013 16:42:34 GMT, KenK wrote:


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.

TIA

I'd guess something to do with the cabinet being metal, potential for
shock. (SWAG)


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
ohmmeter.

Disclaimer: I'm not an electrician. ( I make smoke :-\ )

I think you are one the right track. Find the wiring diagram for the
unit. Is this a roof-top or portable shop cooler?