Help please! Smoke alarm wiring - cable colours...

[Tangledfeet]

Hi,

Foolishly I removed an old, broken smoke alarm without taking a photo or note of where the cables went; there's brown, black, grey and green/yellow (earth, obvs).

However its on a circuit with another identical (to the previous smoke alarm) smoke alarm down the hall so I've had a look at that one and the colours on that are:
Red - Live
Brown - Live
Grey - Neutral
Black - this smoke alarm has TWO black wires and they go to both Neutral and IC

With the new smoke alarm cable only having the brown, black, grey and green/yellow I'm a bit thrown on where they go so any qualified advice would be warmly received.

Thanks!

 

[hotponyshoes]

I am not qualified.
The IC stands for Inter-Connect. You connect this between all the smoke alarms so when one goes off they all go off.
I do not know if there is any standard colour code for the ic wires though?

 

[hotponyshoes]

Smoke alarms are often wired into the same circuit as the lights (so you know if the power has tripped).
Not sure if its helpful to say that but now I have told you everything I know about them.

 

[Tangledfeet]

Ergo black must be IC... just about to turn off the lights on the board and give it a whirl..!

 

[Barking Mat]

I'd assume the black are ic.

 

[brightspark]

well the old colours are red and black which is live and neutral feed . the new colours linked are brown black and grey . brown live grey neutral and interconnected black .anyone who fits them for a living should have sleeved the grey with blue tape and the link black with brown tape