I have three lights in a room.
A and B are on one circuit, and switched from two locations.
C is on another circuit and also switched from two locations.
I would like to change the switching arrangement so that B comes on when either A or C is on. Is there an easy way to do this?
Simplest way would use a relay ...
Make that two relays ...
F scribbled...
Answer either -
A - the electrician is Polish
B - the train arrives 10 minutes early
C - use a 3 amp fuse
1 is more reliable
NT
Two double pole switches are even more reliable.
Wouldn't that require a relay with two coils?
Where can you buy a normal looking double pole changeover switch?
A relay?
Brian
If you do the logic with diodes, its cheaper & more robust. 1kV 1N4007s are cheap as chips.
NT
diode logic become a bit complex with ac.
But then you've got to have low voltage DC available for the switches, rather than keeping coils/contacts all on mains.
Why would you do that?
NT
To try and keep it more understandable for anyone encountering it in future ...
This is becoming a maze of misunderstandings. I see no reason to convert anywhere to low voltage dc, and don't know why you'd consider so doing.
NT
On Thursday 05 December 2013 20:53 snipped-for-privacy@care2.com wrote in uk.d-i-y:
Because someone said "diode" and diode logic only works with DC,
You can do it with one.
I program it in my home automation software, which all the light switches are connected to anyway. If there's been no one in the room for 20 minutes, it switches 2 of them off.
Not at all. Take the 2 switched lives, put each through a diode, pass that output to one side of the relay coil, with the other side to neutral. Voila, diode logic on ac.
NT
Providing you don't mind a pulsating half wave output it will work on AC as well.
Colin Bignell
relays clattering?
I was thinking of using a filament lamp and feeding it from both switches through mains rated diodes. Light output will be reduced, but simple and no moving parts.
Colin Bignell
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.