What does the legislation say?

[Goody]

In a domestic situation one has to have a smoke/fire alarm but does the legislation stipulate that it has to be hard wired to a MCB on the non-RCD side or could that be a simple battery operated (Wicks or B&Q) smoke alarm?

When you find a property without one and the landlord isn't keen on spending for hard-wired ones, would the battery operated ones satisfy the legislation?



Any feedback is much appreciated.

 

[trev]

If memory serves me well, they should be on their own circuit ideally but they can be powered from an adjacent lighting circuit ie take a permanant live and neutral from a nearby light fitting

 

[Octopus]

For rental properties isn't there guidance that says they must be mains powered. As for seperate circuits I thought that it was better, these days, to put them on a lighting circuit!!

 

[trev]

Either way, if there's a smoke and a heat detector or two smokes they have to be interlinked so there's going to be some upheaval wiring the link if nothing else

 

[stuart569]

radio link bases are the mutts nuts

 

[PB1]

I was also taught to put them on a frequently used circuit, such as lighting, so it would be obvious if a breaker had tripped and they were not working.

 

[MarkieSparkie]

Hi Goody, Building Regulations, Part B, Fire Safety, applies to all new and refurbished dwelling houses. OSG 7.5.2 gives basic guidance and EGBR 10.2 and Appendix C gives a fuller explanation of the requirements.

 

[clicon357]

Have a look at this link for some guidance, you want the "FIRE & SMOKE" bit:

http://www.******************/Technical/index.html

 

[Goody]

Have a look at this link for some guidance, you want the "FIRE & SMOKE" bit:

http://www.******************/Technical/index.html

This link doesn't work, thanks!

 

[clicon357]

Try again, sorry about that!

Try typing this this:

www.******************

Then technical section then fire and smokes

 

[Goody]

Try again, sorry about that!

Try typing this this:

www.******************

Then technical section then fire and smokes

Gets me nowhere!

 

[GLENNSPARK]

Well just to add my 2penneth....."safety curcuits should nod be on an RCD"....but....all final circuits for use by either unskilled and/or uninstructed persons to be given additional protection by means of RCD ..etc...etc..
Mad innit.
Pull a feed of a lighting curcuit for your smokes and/or heats and i would say you satisfy both....(assuming the lighting circuit is upto the 17th of course)............

 

[shadewakka]

isnt it a Grade-D smoke alarm Mains powered with battery back-up??
As for wiring i dont have a clue never had to do one so far

 

[brucelee]

Hi GOODY
Can be on own dedicated circuit but its preferable to feed from a regular used lighting circuit as if the lights go off they will more likely notice and turn it back on whereas with a rcbo for smokes they are less likely to spot its off

they should be mains powered with battery back up and interlinked and placed in circulation areas between habitable rooms ie between kitchen and living room
there should be at least 1 per floor, thnink this is for floor area of upto 200m sq
at least 300mm from a light 300mm from walls not over openings in stairwells and preferably have a means of isolation without isolating the lighting circuit if fed from 1 but i believe by removing the smoke this classes as acceptible and no more than 7.5m from all habitable rooms
if the loft is habitable or going to be then you will also have to install one in there
if the kitchen isnt seperated with a door then a heat alarm needs installing

Electricians guide to building regs and OSG has this info mate

 

[clicon357]

Gets me nowhere!

Apologies but I thought it pretty clear in the Kidde document so a couple of things here. Your OP mentioned the word legislation. Legislation is law / mandatory. What we are looking at here is various BS's like our 7671, not law as such but something which "can be used as a defense in law". Basically woe betide anyone who ignores these BS's. Same goes for fire alarms (BS5839 I think). The BS is basically the "prosecution's" go to guide in the event of us having done something outside these guides.

Grade D is the minimum as someone else has said and this is interlinked mains smoke and heat with battery backup. Now dive into your On Site Guide (p65, 7.5.2 Smoke and heat alarms (Part B).

The detectors and alarms are required to be:

a - be linked so that operation of one will initiate all units (mains powered smoke detectors may be interlinked by radio)
b - be permanently wired with an independent circuit from the distribution board (consumer unit) or supplied from a local, regularly used lighting circuit (there should be a means of isolating the supply to the alarms without affecting the lighting)
c - have a standby power supply such as a battery or a capacitor

So a+b+c = Grade D!

Of course if its a TT feed then you could consider feeding from an RCBO maybe i.e a high integrity circuit. Some even suggest say the stairs / landing lights on their own MCB / RCBO along with the smoke circuit. That idea comes from the outside chance that someone could go up to bed without having turned on any downstairs light and get into bed without having turned on any upstairs light (they used the bedside lamp). BUT they are more likely to switch the landing lights on at some time. If the breaker feeding the smokes is on the downstairs or upstairs circuit & has tripped they would never know. Very remote IMO and then of course you should still have the battery backup.

Gets deep doesn't it?