On Fri, 23 Sep 2016 05:35:05 -0700 (PDT),
gghe...@gmail.com wrote:
>On Friday, September 23, 2016 at 12:22:55 AM UTC-4, DoN. Nichols wrote:
>> On 2016-09-22, Michael A. Terrell <
mike.t...@earthlink.net> wrote:
>> > Larry Jaques wrote:
>> >>
>> >> Michael A. Terrell wrote:
>> >>>
>> >>> How about a real limit switch?
http://www.ebay.com/itm/380653721209
>> >>>
>> >>>
>> >>> CUTLER-HAMMER-10316H16C-SINGLE-POLE-DOUBLE-THROW-LIMIT-SWITCH-10316H-16C-USPP-/
>> >>
>> >> He needs a DPST, not an SPDT. I'm with Don on the AC relay as a
>> >> simple fix, with a simple wall switch actuator.
>> >
>> >
>> > The photo in the listing shows four terminals in two sets of two, so
>> > it looks like the description is wrong.
>>
>>
>> The photo of the label shows that it has either one pair of
>> terminals connected or a second one. Sort of single pole single throw,
>> if you connect say screws 2 and 3 together.
>>
>> Not what is needed in this case -- assuming a 240 VAC motor.
>>
>> Enjoy,
>> DoN.
>
>Hi all, not that it matters, but the motor was 120 VAC and I just needed
>a single pole switch. Only 1/2 of the switch shown in the picture was
>used.
>
>George H.
The reason a 2 pole switch is used in this type of machine is
simple...you want to be able to turn off BOTH legs of power when the
cut is done or the machine is turned off.
On a 110vt circuit...it works the same..removes both the hot and the
neutral. "Best Practices".
What happens if Joe Nose Picker cut the cord/plug off your saw by
accident and then reinstalls it...but reverses the black and white
wires? Saw will run properly..but when the single pole switch is
opened..it opens the Neutral..leaving the hot wire still alive. That
can be something of a nasty surprise.
Many industrial single phase machines can be changed from 110 to 220,
simply by changing the wireing. Dual windings..shrug..or at worst
simply swapping in a different motor. Same if running it on a
transformer....etc etc. That single pole switch ..under your control
in your home shop is just fine..but in Industry..safety people often
go the distance and make sure the device is Safe.
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