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Advice please - 3 way light switches - I just moved into an older house
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Posted to alt.home.repair
Keith Williams
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Advice please - 3 way light switches - I just moved into an older house
In article . com,
says...
mm wrote:
On Mon, 16 Jan 2006 12:02:15 GMT,
(Beachcomber)
wrote:
Three way (and four way) switches are mis-named but no-one ever
bothered to change the term for a better understanding of common
electrical use. A three way switch is more correctly termed a Single
Pole Double Throw switch (SPDT). Why then, is it called a three
way switch? Because it has three terminal screws on it?! Very
strange.
LOL. Good point.
'm sure whoever called it "3-way" first knew exactly how it worked. I
wonder what he was thinking.
It's 3-way because there are 3 different ways the light can be on.
S #1 "up" S #2 "Up"
#1 "up" & #2 "up" = off. Otherwise SPST switches would work (and
you coudn't turn the light both on and off from either end).
S #1 "up" S #2 "down"
S #1 "down" S #2 "up"
or Switch #2 "
--
Keith
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