Smoke-Heat-Carbon detectors

[driverman]

Hi Guys, Spoke in earlier threads about S/H/Co detectors ect. Listen to opinions and comments and decided to go for the Acio equipment. However home owner went and got the Kiddie type. No doubt they will do the job but, As far I can see the fittings are designed to fit onto plaster cavity wall type fixings. I was hoping to seal holes up where cables come through ceiling and fit directly onto the joist. What you Guys think of the kiddie fittings. The way I'm looking at it with the Kiddie ones is the ceiling fire rating has been broken.

 

[andyb]

Because the minimum permitted csa of conductors (other than for a lighting circuit) is 1.5mm^2.

Is that bs7671 or bs5839?

 

[Risteard]

It is a requirement of BS 7671.

 

[andyb]

It is a requirement of BS 7671.

Can you be a bit more specific,

Do you mean all circuits or just circuits supplying smoke detectors. Maybe give a reg no.

 

[Octopus]

Can you be a bit more specific,

Do you mean all circuits or just circuits supplying smoke detectors. Maybe give a reg no.

I think he is referring to the changes made to table 52.3 when the BGB came out. So if the smokes are on their own circuit they need to be 1.5mm but if they are on a lighting circuit they can be on 1mm

 

[driverman]

I think he is referring to the changes made to table 52.3 when the BGB came out. So if the smokes are on their own circuit they need to be 1.5mm but if they are on a lighting circuit they can be on 1mm

Ok, so in my case, at this point in time, i have wired the smoke/heat and carbon detectors on their own RCBO circuit. I don't like doing this but, to comply with regs, I could disconnect from existing RCBO and double up on another lighting RCBO. In other words, have 2 x radial circuits off 1 x RCBO.

Would that be compliant to BS7671?

 

[bigbaddave]

I'm a aico fan myself, I've used cheaper products a few times but always go back to aico

 

[driverman]

I'm a aico fan myself, I've used cheaper products a few times but always go back to aico

Just seems awkward to have to cut in a cavity wall box into the ceiling, thus reducing it's 30min holding back a fire should one occur.

 

[123]

Just seems awkward to have to cut in a cavity wall box into the ceiling, thus reducing it's 30min holding back a fire should one occur.

Why do you have to do that? I use aico's and never had to do that.
Aico's also have intumescent foam which would seal the hole in event of fire.

 

[driverman]

Why do you have to do that? I use aico's and never had to do that.
Aico's also have intumescent foam which would seal the hole in event of fire.

ahh sorry. my comments were re earlier threads.....see OP. I was referring to the Kiddie range that the customer had purchased. I proposed using Aico dectectors.

 

[123]

ahh sorry. my comments were re earlier threads.....see OP. I was referring to the Kiddie range that the customer had purchased. I proposed using Aico dectectors.

Tell them to buy one of these for each detector Kidde Universal Base For Firex Alarm Range

 

[Resu]

Realise it's probably too late but would this have solved your problem? (We've never used them)

 

[driverman]

Tell them to buy one of these for each detector Kidde Universal Base For Firex Alarm Range

As it's a brand new build, the base plate will make the detectors more baulky

 

[driverman]

Realise it's probably too late but would this have solved your problem? (We've never used them)

I've used similar for sockets on stud walls

 

[123]

As it's a brand new build, the base plate will make the detectors more baulky

They are there to operate, not fascinate See them installed quite a lot, they look ok.

 

[driverman]

They are there to operate, not fascinate See them installed quite a lot, they look ok.

It's like most jobs though, if I know it could of been done better, it annoys me.