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Double Pole switch??? J.C. 03-25-2007
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Posted by Mark Lloyd on March 26, 2007, 5:50 pm



>On Sun, 25 Mar 2007 14:38:57 -0400, "Joseph Meehan"
>
>>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.
>>>
>
>Well, a double-pull double-pole switch can be used as a crossover
>switch in the middle of a multi-switch run. A single-pull
>double-pole switch is used to turn off two things simultaneously,
>or both legs of a 240V branch.
>
>--Goedjn
>

I've seen double-pole double throw (DPDT) switches used with DC
motors, that could run in either direction depending on polarity.

A "4-way" switch is logically (physically?) a DPDT switch with
opposite contacts internally connected, so it has this reversing
function.
/----------\
| |
-------------O| |O--+--\
| - - | | |
/----O| |O--+--+-----------
| | |
--------+----O O--/ |
| | |
| \-------------/
|
\-------------------------------
--
Mark Lloyd
http://notstupid.laughingsquid.com

"So far as I can remember, there is not one word
in the Gospels in praise of intelligence."
--Bertrand Russell

PexSupply PEX Tools 468x60
Posted by mm on March 26, 2007, 5:53 pm



>On Sun, 25 Mar 2007 14:38:57 -0400, "Joseph Meehan"
>
>>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.
>>>
>
>Well, a double-pull double-pole switch can be used as a crossover
>switch in the middle of a multi-switch run.

I used a little DPDT slide switch with my analog VOM, voltmeter, to
reverse the test leads. Made it very quick on the ohmmeter setting to
test diodes in both directions, to test capacitors by watching them
charge then discharge and charge again. Didn't do this until after
ran out of regular probe wire and was using speaker wire for my test
probes.

I put a blob of silicone sealant over the solder connections so I
wouldn't zap myself. 25 years, still fine.

A single-pull
>double-pole switch is used to turn off two things simultaneously,
>or both legs of a 240V branch.
>
>--Goedjn
>


Posted by J.C. on April 1, 2007, 4:32 pm



>
>>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
>>
>
> Here is an example: A typical electric water heater, it has two hots,
> and no neutrals. So you can use the double pole as a local disconnect
> for this case, as a guess.
>
> tom @ www.Numerology-Readings.com
>

Thanks folks. I believe I've got it straightened out now.

JC



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