DPST? 2 switch / 3 circuits (2 independent, 1 shared)

[BHI]

Is this the right/best way?! Simplified diagram:


Problem: Two light switches will operate three light circuits - the middle one to come on with either switch.

Context: Living / dining area with downlights in a boxy "8" shape - ie. all around the outside of the ceiling, and then a joining row in the centre. Want either side of (and including) middle row to be able to be lit independently. Middle row must be lit with either and/or both switches.

Questions:

1. Do DPST domestic light switches exist?

2. What are the wiring / load / etc implications of none / one / both switches being on?

3. Any obvious alternatives? (other than not doing it!)

4. Is there such a thing as a "one-way valve" so the middle row can be wired in to two SPST switches (without also lighting the other circuit too)?

Many thanks!

 

[Lighthouse Phil]

DPST ?? Double Pole Single Toggle-----Yes
Why not make life easy and use a 3 gang switch. If you want the middle lights on with either other set, SWITCH IT ON.
Your loading will depend on the type of light fitting to be used. (As well as installation method).
Valves are mainly used by the lesser trades (Plumbers)

 

[Knobhead]

There is a way of doing it with relays. But totally over the top for what’s needed. RH switch for RH lights, centre switch for centre lights,,,,, et al. or is that to simple for the el thicko customers?

 

[Richard Burns]

If the switches are physically separated then use two two gang switches and wire the centre strip as a two way switch so switched from either end independently of the other two.