On Fri, 19 Jan 2018 11:58:38 -0800 (PST), Simon Roberts
Yeah we have only been doing it in "3 way/4 way" switch loops for a
little over a century.
You know we have this "wheel" thing going pretty good now too ;-)
Seriously that is how that light that you can control from the top or
bottom of a stairway works. You can put as many "4 ways" in the middle
of those "travelers" as you want.
On Fri, 19 Jan 2018 15:08:52 -0800 (PST), Simon Roberts
Every time I use a hole saw.
To control the light from different places. It doesn't have to be a
staircase, that was just an example required in the electrical code.
The 2 wires taking the signal between the multi pole switches in the
The answer is you might have a 4 way with the intermediate switch on
the landing for each floor between the ground floor and the top floor
if there are more than 2 stories.
You can also just have a room with more than 2 doors and want a switch
at all of them.
On Sun, 21 Jan 2018 07:31:26 -0800 (PST), Simon Roberts
I have to wonder about an engineer who has never heard of an LM 317
and doesn't seem to know how to find out. I also wonder about why you
are so impressed by a very simple circuit involving 3 switches and a
light bulb. Where did you get your degree and what state has certified
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