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Home > Archive > Electrical code Compliance > June 2005 > 2Switches - one light - how?
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2Switches - one light - how?
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| vjp2.at@at.BioStrategist.dot.dot.com 2005-06-17, 11:31 pm |
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We have two switches (on top of stairs, one bottom) for a light.
(It was set up in 1965, so I don't think there's fancy chipwork.) How
was this set up? I'm thinking of replacing one switch with an infrared
motion detector switch, but I have had some problems with these IR
detectors if the lightwork is too fancy (eg, one LED bulb would never
switch off in IR mode, but would manually switch on/off).
- = -
Vasos-Peter John Panagiotopoulos II, Columbia'81+, Bio$trategist
BachMozart ReaganQuayle EvrytanoKastorian
http://ourworld.compuserve.com/homepages/vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Fooey on GIU,{MS,X}Windows 4 Bimbos] [Cigar smoke belongs in veg food group]
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| vjp2.at@at.BioStrategist.dot.dot.com wrote:
quote:
>
> We have two switches (on top of stairs, one bottom) for a light.
> (It was set up in 1965, so I don't think there's fancy chipwork.) How
> was this set up? I'm thinking of replacing one switch with an infrared
> motion detector switch, but I have had some problems with these IR
> detectors if the lightwork is too fancy (eg, one LED bulb would never
> switch off in IR mode, but would manually switch on/off).
>
> - = -
> Vasos-Peter John Panagiotopoulos II, Columbia'81+, Bio$trategist
> BachMozart ReaganQuayle EvrytanoKastorian
> http://ourworld.compuserve.com/homepages/vjp2/vasos.htm
> ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
> [Homeland Security means private firearms not lazy obstructive guards]
> [Fooey on GIU,{MS,X}Windows 4 Bimbos] [Cigar smoke belongs in veg food group]
"Three-way" switches can be wired in several ways, depending on
physical layout. see
http://www.the-home-improvement-web...-way-switch.htm
Are you using a *3-way* motion sensor switch like this one:
http://www.acehardware.com/product/...oductId=1294389
--reed
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| James Sweet 2005-06-17, 11:31 pm |
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<vjp2.at@at.BioStrategist.dot.dot.com> wrote in message
news:d78r1b$c20$3@reader1.panix.com...
quote:
>
>
> We have two switches (on top of stairs, one bottom) for a light.
> (It was set up in 1965, so I don't think there's fancy chipwork.) How
> was this set up? I'm thinking of replacing one switch with an infrared
> motion detector switch, but I have had some problems with these IR
> detectors if the lightwork is too fancy (eg, one LED bulb would never
> switch off in IR mode, but would manually switch on/off).
>
>
It's simple, it's just a pair of SPDT switches wired together, been used in
just about every multi-floor house since practically the dawn of household
electricity. Most split level houses common in the 60's and 70's have a DPDT
"4-way" switch on the landing so the entryway light can be controlled from 3
locations and you can chain together as many of those as you want.
You can get dimmers, motion detectors and other stuff like that designed for
3 way use though some of it has limitations.
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| Dave Plowman (News) 2005-06-17, 11:31 pm |
| In article <d78r1b$c20$3@reader1.panix.com>,
<vjp2.at@at.BioStrategist.dot.dot.com> wrote:
quote:
> We have two switches (on top of stairs, one bottom) for a light.
> (It was set up in 1965, so I don't think there's fancy chipwork.) How
> was this set up? I'm thinking of replacing one switch with an infrared
> motion detector switch, but I have had some problems with these IR
> detectors if the lightwork is too fancy (eg, one LED bulb would never
> switch off in IR mode, but would manually switch on/off).
L1 L1
0===========0 0===========0============= Line
| \ / |
C 0================================O C
\ / \ /
0===========0 0===========0============= Switch return
L2 Optional L2
Intermediate
If you wanted to replace a two way switch with an IR operated one it would
need to have a Single Pole Double Throw relay etc. Ie, three switch
^ ^ ^ ^
terminals.
If you wanted to *add* it to an existing two way switched circuit it would
need a Double PDT relay wired as per the intermediate above, or the wiring
altered to take a discrete intermediate switch in one of the original
positions and the IR one as a two-way at the end of the altered circuit.
--
*Taxation WITH representation ain't much fun, either.
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
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