Smoke detector help please

[mungo9]

I have recently completed my first job and it was an extension to my Uncles house. i haven't qualified yet but the job went well and everything works, although i have 1 issue. Due to my lack of experience where my uncle was trying to save money on the job he said he didn't want smoke detectors wired in and would buy them separately, obviously i normally wouldn't say thats okay. However now the job has ended and the Building inspector is coming round soon, i realise to be safe and make sure everything passed i should have just put them in. I still need to choose the battery powered smoke and heat detectors that will pass.
Can anyone tell me what battery powered smoke dectectors i should get? and if they comply with the regs.

 

[Simlec]

Key switch like you do for EM lights.

 

[Simlec]

And extractor fans

 

[Slowhand]

I always put smoke detectors on a dedicated circuit. It prevents them being affected by other equipment or people adding extra loading to the circuit.
You can argue that they have battery back up but you can't guarantee it to work every time.
These things save lives perhaps even yours so weigh that up against the cost of an mcb and a few metres of cable.

 

[tazz]

BS5839 Part 6 is very clear on this, A Grade D system can be wired by independent lighting circuits or by a dedicated circuit. A Grade E system must be dedicated circuit.

 

[gutterball]

I deal with a lot of rental and student properties,and I've seen quite a few turned off at the breaker due to nuisance tripping (burnt toast etc). That is why I prefer to Put them on with the lights.

 

[Slowhand]

I deal with a lot of rental and student properties,and I've seen quite a few turned off at the breaker due to nuisance tripping (burnt toast etc). That is why I prefer to Put them on with the lights.

Doesn't the battery back up keep them functional?

 

[Octopus]

Doesn't the battery back up keep them functional?

I bet they take the batteries out too!

 

[tazz]

I deal with a lot of rental and student properties,and I've seen quite a few turned off at the breaker due to nuisance tripping (burnt toast etc). That is why I prefer to Put them on with the lights.

If it is a dedicated circuit, such as Grade E, I would suggest mcb lockoffs,

 

[tazz]

Personally I think this has been the most worrying and confusing thread I read up to date. And a read of the BS5839 sounds well over due as professional sparks. Posts have mixed up Part6, Part 1 , Grade A, Grade D, and Grade F which all have their own standards, and places. So lets look at it.
1. Supply isolation is grade A (Fire control panel) 2. Grade D does not require a separate dedicated supply (due to battery backup) 3. Grade E does require a dedicated supply circuit (due to no battery backup) Grade F battery only detection, can only be used in private dwellings, being customers choice. A variation agreement maybe reach to fit Grade F (such as listed building) 4. Building control are there for a reason, and actually hand it to you on a plate...or drawings in this case. Dont follow their instructions...and you will get burnt.

 

[Octopus]

Personally I think this has been the most worrying and confusing thread I read up to date.

And a read of the BS5839 sounds well over due as professional sparks.

Posts have mixed up Part6, Part 1 , Grade A, Grade D, and Grade F which all have their own standards, and places.

So lets look at it.

1. Supply isolation is grade A (Fire control panel)
2. Grade D does not require a separate dedicated supply (due to battery backup)
3. Grade E does require a dedicated supply circuit (due to no battery backup) Grade F battery only detection, can only be used in private dwellings, being customers choice. A variation agreement maybe reach to fit Grade F (such as listed building)
4. Building control are there for a reason, and actually hand it to you on a plate...or drawings in this case.

Dont follow their instructions...and you will get burnt.

I've made that easier to read!

 

[shanky887614]

Personally I think this has been the most worrying and confusing thread I read up to date. And a read of the BS5839 sounds well over due as professional sparks. Posts have mixed up Part6, Part 1 , Grade A, Grade D, and Grade F which all have their own standards, and places. So lets look at it.
1. Supply isolation is grade A (Fire control panel) 2. Grade D does not require a separate dedicated supply (due to battery backup) 3. Grade E does require a dedicated supply circuit (due to no battery backup) Grade F battery only detection, can only be used in private dwellings, being customers choice. A variation agreement maybe reach to fit Grade F (such as listed building) 4. Building control are there for a reason, and actually hand it to you on a plate...or drawings in this case. Dont follow their instructions...and you will get burnt.

we fit smoke alarms but I know for a fact that he doesn't own a copy of bs5839

I doubt the guy that tests and installs It has either

 

[Sparkie30]

Which regs are they?

See post 29 thanks to snowhead.

 

[tazz]

Regs state

Smoke detectors should be powered by a mains supply connected to a separate circuit on the dwellings distribution board (consumer unit) have battery back up and interlinked if there is more than one in the dwelling.

As Document B also states the exact same as BS 5839....Document B 1.17 & 1.18
You do not need a dedicated circuit on a Grade D system

 

[Simlec]

we fit smoke alarms but I know for a fact that he doesn't own a copy of bs5839

I doubt the guy that tests and installs It has either

Who's he?

 

[GLENNSPARK]

I bet they take the batteries out too!

they may even just snip them off with some scissors.....
like i came across once at this rented up Harehills...