house circuit breaker question.

   / house circuit breaker question. #32  
The "3-way" description is a term used by electricians. The "single pole double throw" description is the more proper basic description of what the switch does and how it works, even though it probably won't get you the correct switch in a search. Sort of like a "crescent wrench" versus a "adjustable wrench".
 
   / house circuit breaker question. #33  
Going to a lowes or homedepot and asking for a single pole double throw switch will prolly get some funny looks too.
 
   / house circuit breaker question. #34  
Going to a lowes or homedepot and asking for a single pole double throw switch will prolly get some funny looks too.
Asking ANY question at home depot will get funny looks:laughing:
 
   / house circuit breaker question. #35  
Going to a lowes or homedepot and asking for a single pole double throw switch will prolly get some funny looks too.

I was thinking this very same thing today, the next time I go to HomeDepot I'll ask for a 3-way single pole double throw light switch, just show what I know about the double throw, but to be fair, there have been a few times in the past couple year's at HD and Lowes where the guys have been very helpful to me, and that could be from more store competition. I guess I was told wrong all those years ago that I needed a 2 pole switch.
 
   / house circuit breaker question. #36  
Its amazing how easy it is finding something online when I type in the right description, (3 way illuminated light switch), just bought a name brand Leviton 3way single pole double throw illuminated light switch on ebay. Next week I' should be able to walk in my cellar and find the light switch without knocking everything else over.
 
   / house circuit breaker question. #37  
Single pole single throw = spst
Single pole double throw = spdt,
You get the idea: image-1272563277.jpg
 
   / house circuit breaker question. #40  
You're working with 3-way switches at the top and bottom of the stairs. 3-way switches are single-pole double-throw (either switch can supply power to the load)...as opposed to a standard switch which is a single-pole single-throw (only one switch supplies power to the load). Double-pole switches will switch two lines simultaneously...similar to a two-pole breaker, which is a 2-pole single-throw.
SPDT switches operate in series. The 1st switch selectively powers either pole of the second. Only the second switch applies power to the load.
larry
 

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