RK
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| posted on 22/1/09 at 03:47 PM |
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basic switch question
Dumb question maybe...
Fan switch: ON - OFF
Poles on back: 1 - 2 - 3
If all we want is ON and OFF, what is the third pole for?
I have managed to figure out wiring all my instruments, and now I'm onto switches.
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JAG
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| posted on 22/1/09 at 04:12 PM |
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Third pole is for the Normally closed/normally open function'
So the three contacts will be;
Common
Normally closed
Normally open
Get a multimeter and check it out but that will be the functions.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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designer
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| posted on 22/1/09 at 04:30 PM |
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Might be helpful
http://www.kpsec.freeuk.com/components/switch.htm
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02GF74
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| posted on 22/1/09 at 05:47 PM |
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wot Jag says.
you need to think inside the box, the switch box.
inside is a spring loaded wiper that moves on a pivot.
As show in the picture, contact is made between 2 and 3 - this is n.c.
you push the toggle down, contact is made between 1 and 2 now - this is n.o.
 
Rescued attachment swt.JPG
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GeorgeM
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| posted on 22/1/09 at 08:50 PM |
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unless the switch is illuminated single pole.
third connection could be for this.
George
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RK
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| posted on 26/1/09 at 05:47 PM |
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That's it. Tx
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