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PostPosted: Sun Dec 16, 2018 1:30 pm 
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I'm looking at installing two wired Nest protects to replace all the existing wired smoke alarms

I've come to examine the wiring and it looks different to what I was expecting. On the downstairs alarm there are two brown wires (Live I presume), one blue and one white with blue label (neutral) and one black (interconnect) and one yellow/green (earth) all going in to terminal block with white, brown and blue coming out. One of the brown, the white with blue label and black seem to be coming out of a separate cable in the ceiling from the others.

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Upstairs there is only on each of brown, black (with brown label confusingly), earth and white (blue label) going in to block and blue, brown and white coming out

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What are the "extra" live and neutral in the downstairs alarm? Part of the interconnect? What should I do with them?


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PostPosted: Sun Dec 16, 2018 2:13 pm 
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They are not extra.

Q)If you look at your 2nd picture what have you got?

A) Black, white & brown


Q) If you look at your first picture what have you got

A) Two browns, a blue and a black


Q1) How do you suppose the second detector is connected to the first detector?

A) Via the cable with black white and brown

Q2) How do you suppose they are powered?

A) Via the other brown and blue cable in the first detector.


As for the earth's it's not one, it's two, what the installer did was to put both earth wires in the same sleeving.

Now do you understand what to do?

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PostPosted: Sun Dec 16, 2018 4:29 pm 
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Yeah, I think I found the answer (same as yours) soon after I posted. Would you separate the earth wires from their sleeving or just put the "one" joined wire into a terminal block. I guess they're heading into the same terminal block anyway (as per Nest instructions)


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