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Posted by Art Todesco on March 25, 2007, 3:28 pm
Other than 240 volt applications, I can
think of one that we used in my church.
There was 1 exhaust fan for both the men
and womens washrooms. A double pole
switch in each washroom .... one pole
for the lights in that room and the second
pole for the fan. In essence, if either
room is occupied (the light is turned
on) the
fan will run. When lights in both rooms
are off, the fan will shut down. This
avoided using relays to accomplish the
same.
Jeff Wisnia wrote:
> J.C. wrote:
>> I bought a Double pole switch. Why, I don't know. I looked in my
>> trusty electrical handbook and my copy of the 2007 NESC handbook (to
>> most wasted $65.00 I've ever spent) and nowhere is there a reference
>> to a "Double Pole Switch". So, what is a "Double Pole Switch" and what
>> is it used for.
>>
>> I've used many a single pole switch and a number of 3 way switches in
>> my time but this one's got me a bit baffled.
>>
>> TIA
>>
>> JC
>>
>
> Since you don't seem to know what double pole switches can do, you may
> also not know what "double throw" means either.
>
> If that switch has six terminal screws on it, not counting a frame
> ground screw, then it is a "double pole - double throw" switch, most
> often used for multilocation switch control of a light or other load,
> i.e when more than just the two switches provided by a "three way"
> switch system are desired.
>
> If it only has four terminal screws on it, than it's a "double pole -
> single throw" switch, and others have already told you what it can be
> used for.
>
> HTH,
>
> Jeff
>
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