From: email@example.com (Loan Nguyen)
Subject: Re: 2 Switch, light bulb either/or thing.
Date: 9 Oct 2002 12:23:21 -0700
References: <firstname.lastname@example.org> <3DA377A2.637ED171@mfi.net> <3DA43BB8.A628E12C@mfi.net>
NNTP-Posting-Date: 9 Oct 2002 19:23:22 GMT
"Michael A. Terrell" wrote in message news:<3DA43BB8.A628E12C@mfi.net>...
> Loan Nguyen wrote:
> > "Michael A. Terrell" wrote in message news:<3DA377A2.637ED171@mfi.net>...
> > > Loan Nguyen wrote:
> > > >
> > > > email@example.com (ThatsWatt) wrote in message news:<firstname.lastname@example.org>...
> > > > > Sorry but I canīt think of a better name for this circuit! But anyway,
> > > > > for all of you that want to know how the get two independent light
> > > > > switches to either turn on or turn off the same light bulb see the
> > > > > link below. It is very handy for wiring the light in a stairwell, with
> > > > > one switch at the bottom of the stairs and one at the top. Hope you
> > > > > like it?!
> > > > >
> > > > > http://www.thatswatt.com/electron/lightthing.html
> > > >
> > > > How about 3 switches controll 1 bulb,... or N switches do the same thing ?
> > >
> > > You mean the infamous "N-Way Switch?"
> > Sorry, Nope. I meant N number of switches.
> The concept is counting the switches from one end of the circuit, and
> back to the first switch to show that all modes work at all locations.
> I have seen the old ceramic push button light switches that were three
> way, and they haven't been made in decades. Probably prior to WWI or
> WWII. Like all trades, ideas get names which may not make a lot of
> sense outside that industry, or even the region.
> The "three way" definition is from electrical usage meaning using
> two switches. With the light off and starting from either switch, then
> the other you have an "ON", "OFF", "ON" function. which is their
> definition of "Three way"
> The "four way" definition is from electrical usage meaning using
> three switches. With the light off and starting from any switch, then
> any other you have an "ON", "OFF", "ON", "OFF" function.
> You can't expect a simple wire jockey to understand the concept of
> "N+1" function, without naming each function. Some insist that you
> can't have more than a "Four way switch", even with a dozen or more
> switches, because that is how the parts are marketed.
I think the "four way" switches can do it (the one with 4 terminals,
you can buy it at Home Depot).
If I named it wrong, then here is what it looks like, whatever it is
Assume the switch has two states: UP & DOWN
1----------3 1----\ /-----3
2----------4 2----/ \-----4