Attic light off fire alarm?

mattgriff88 · Sep 3, 2024

This is it. Found a picture on amazon. It has a black plug that clips in to the top of the alarm and leaves 2 wires.

littlespark · Sep 3, 2024

That explains the unused black wire of the 3C&E.... Nest detectors use radio or wifi to communicate with each other.

mickegh · Sep 3, 2024

Seems to be the type that's supplied with a flat base in picture to secure the alarm ?

Then there's an additional deep base to terminate the fixed wiring into which hasn't been fitted hwre

mattgriff88 · Sep 3, 2024

mickegh said:
Seems to be the type that's supplied with a flat base in picture to secure the alarm ?

Then there's an additional deep base to terminate the fixed wiring into which hasn't been fitted hwre

I can't see anything on Google about an additional deep base. Where are you seeing that too? Hopefully I can get a spare from somewhere if that is the case.

Back to the light and getting the power off the fire alarm circuit. Am I right in saying the only reason not to do this is because if the light trips it will trip the fire alarm possibly without me knowing until I go to switch the light on again?

mickegh · Sep 4, 2024

mattgriff88 said:
I can't see anything on Google about an additional deep base. Where are you seeing that too? Hopefully I can get a spare from somewhere if that is the case.

Back to the light and getting the power off the fire alarm circuit. Am I right in saying the only reason not to do this is because if the light trips it will trip the fire alarm possibly without me knowing until I go to switch the light on again?

Presumably maintenance or a local outage you're taking out lights and alarms at same time and vice-versa

Also it's better electrical design to have lights and alarms separate

Notwithstanding the fact that alarms and lights may be "bunched" at an mcb. This has some advantage that the homeowner will not easily disable alarms as lights will be affected .Also the electrician can more easily separate the alarms and lights at MCB when troubleshooting etc .

On the connection base .As another poster said some have a separate connection base.

Nor familiar with the nest but it would seem strange if they were designed so that the single-insulated cabling was to be exposed in attic. It wouldn't be satisfactory even with an enclosure for the wagos

UNG · Sep 4, 2024

Do the Google Nest detectors actually comply with the requirements of the building regs with regard to the interconnectivity needing a WiFi connection
Most if not all the Google detectors I have seen say they are standalone

Rockingit · Sep 4, 2024

UNG said:
Do the Google Nest detectors actually comply with the requirements of the building regs with regard to the interconnectivity needing a WiFi connection
Most if not all the Google detectors I have seen say they are standalone

They don't use wifi as the interconnect, they use an RF network of their own (think it's bluetooth based with extra beans) and as they have internal battery backup then power can drop and they still work. They use wifi to talk to the outside world, yes, but not as part of the safety system.

Risteard · Sep 4, 2024

UNG said:
Do the Google Nest detectors actually comply with the requirements of the building regs with regard to the interconnectivity needing a WiFi connection
Most if not all the Google detectors I have seen say they are standalone

They have no heat detector which is a problem.

Rockingit · Sep 4, 2024

Risteard said:
They have no heat detector which is a problem.

They're multi-sensor by default. When you tell one that it's in a kitchen it will use a different algorithm than if you tell it it's in a lounge or a garage. They also have CO detection built-in by default, too.

There's a lot of myths about them simply because a lot of people don't actually understand them and expect them to be the same and behave the same as every other detection system.

littlespark · Sep 4, 2024

I thought it was that their heat detectors were not built to the British Standard which was stated by building regs or some other document.

So they maybe work just as well, in a different way… but without that number, they can’t be accepted for jobs that require planning or building regs

UNG · Sep 4, 2024

I suppose the really big question is how much do you cherish your life to place your personal safety in the hands of Google or one of their devices
Personally I don't even trust them to do an internet search with all their pay per click and dodgy optimisation

mickegh · Sep 5, 2024

Rockingit said:
They're multi-sensor by default. When you tell one that it's in a kitchen it will use a different algorithm than if you tell it it's in a lounge or a garage. They also have CO detection built-in by default, too.

There's a lot of myths about them simply because a lot of people don't actually understand them and expect them to be the same and behave the same as every other detection system.

When you say different algorithm in a kitchen do you mean they switch from heat+smoke to heat only or something in between

It seems a little unsatisfactory if the householder can change settings on fire alarms

Rockingit · Sep 5, 2024

UNG said:
I suppose the really big question is how much do you cherish your life to place your personal safety in the hands of Google or one of their devices
Personally I don't even trust them to do an internet search with all their pay per click and dodgy optimisation

The core tech was never Google. The core technology was Nest, and it’s sound. They got bought up by Google looking for a way in to the home tech market.

Attic light off fire alarm?

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