Domestic extention and smoke alarms

[davesparks]

No isolation needed between lighting and smoke alarms, but would be better all smokes on a separate circuit themselves.

Smokes should be wired to a regularly used lighting circuit, I believe this is the recommended method in the BS.
This is to ensure that any failure of the circuit is readily identified and rectified.

A dedicated circuit is unlikely to be noticed if it trips, or fixed with any hurry.

 

[Dunk17]

Smokes should be wired to a regularly used lighting circuit, I believe this is the recommended method in the BS.
This is to ensure that any failure of the circuit is readily identified and rectified.

A dedicated circuit is unlikely to be noticed if it trips, or fixed with any hurry.

I think the isolation is very much dependant on the local building control, attached is a document from temside stating it needs to be in place

 

[westward10]

Smokes should be wired to a regularly used lighting circuit, I believe this is the recommended method in the BS.
This is to ensure that any failure of the circuit is readily identified and rectified.

A dedicated circuit is unlikely to be noticed if it trips, or fixed with any hurry.

Approved Doc B and BS5839:6 cite an independent circuit or the use of a lighting circuit.

 

[pc1966]

I think the isolation is very much dependant on the local building control, attached is a document from temside stating it needs to be in place

If it is coming from the lights, so you can't isolate it without no lights, then I would personally want to see some means of isolation.

You don't want it to be accidentally switched which is why I would go for a keyswitch sort, but I guess a FCU that is out of normal reach is another option (might be an issue for disabled access of course...). Hopefully others on here will know better!

 

[westward10]

I think the isolation is very much dependant on the local building control, attached is a document from temside stating it needs to be in place

I could be incorrect here but I believe the purpose of isolation was so as not to interfere with the lighting for maintenance and was quoted in Approved Doc B. This is no longer quoted in Approved Doc B so I would actually question that as they may be using out of date requirements.

 

[Midwest]

So it's only applicable to the extention not the whole house? If so, installing wired in the extention and battery in the house linked would potentially satisfy LBC?

You'll need to clarify with your LBC. With a major alteration or extension to a property, BI's can get a bit picky, and start applying particular building regs to the whole property. I had to install & link fire alarms to my whole house (basic level), when I had an extension done some years ago. Has the extension had building regs plans done? It might show them on the drawings.
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Smokes should be wired to a regularly used lighting circuit, I believe this is the recommended method in the BS.
This is to ensure that any failure of the circuit is readily identified and rectified.

I believe that it is actually either a lighting circuit or a dedicated circuit from the DB. But as I haven't a copy of BS 5839, I can't back that up factually. But you can search for the subject, which kinda confirms this;

The 17th Edition Myth Exploded - concerning the Fire, Smoke and Heat alarms

www.sparksdirect.co.uk

 

[Ian1981]

Smokes should be wired to a regularly used lighting circuit, I believe this is the recommended method in the BS.
This is to ensure that any failure of the circuit is readily identified and rectified.

A dedicated circuit is unlikely to be noticed if it trips, or fixed with any hurry.

Both are acceptable methods in bs5839-6 tho rented properties and hmo if applicable ,it is seen as better to do it from the lighting for the very reasons you’ve stated.

 

[Dunk17]

Thankyou for all your responses, they've been really helpful.

I have a friend of a friend that works for building control for a different council, he's said that either way is suitable and building regulations are only applicable to the extention. I will try and run a new circuit that covers the whole house and not just the extention, although it could be tricky to get to some locations without chopping the ceiling.

A secondary question... I'm looking at installing Nest, does anyone else have a prefrance of detector? It's my own home so I'm happy to pay a little extra for better quality.

 

[Midwest]

Thankyou for all your responses, they've been really helpful.

I have a friend of a friend that works for building control for a different council, he's said that either way is suitable and building regulations are only applicable to the extention. I will try and run a new circuit that covers the whole house and not just the extention, although it could be tricky to get to some locations without chopping the ceiling.

A secondary question... I'm looking at installing Nest, does anyone else have a prefrance of detector? It's my own home so I'm happy to pay a little extra for better quality.

It’s your preference, I understand Nest links into other products and WiFi , iPhone etc. Aico have an app, and are well respected fire alarm manufacturer.

Take your pick.

 

[Risteard]

Thankyou for all your responses, they've been really helpful.

I have a friend of a friend that works for building control for a different council, he's said that either way is suitable and building regulations are only applicable to the extention. I will try and run a new circuit that covers the whole house and not just the extention, although it could be tricky to get to some locations without chopping the ceiling.

A secondary question... I'm looking at installing Nest, does anyone else have a prefrance of detector? It's my own home so I'm happy to pay a little extra for better quality.

Nest don't have heat detectors, and for this reason I would avoid them.