3 extractor fan supplies switching

[dasersc]

Ive got an apartment with 3 bathrooms all on 1 fan which is on permanently, they want to be able to switch on a light in each individual room and the fan but go off when the light goes off too. is there a relay or contactor that will take 3 diferent supplies but not backfeed to the lights in the other rooms, or a way of wiring it. thinking of 3 feeds from each room light to 3 separate relays controlling a parallel feed to the fan, any ideas otherwise or better. All lights and fan on same circuit 240v.

 

[davelerave]

i think there is a multi-input relay available for this purpose

it would be similar to the 'logic strip' used for heating control-multiple inputs with one output

 

[Sintra]

Instead of using standard light switches you can use a double pole switch have a look at this diagram although it is only showing 2 lights and 1 fan it will be the same principle.

View attachment Common fan switching.pdf

 

[davelerave]

ya that will work too

if it's not much trouble