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Ask The Trades › DIY Forum › Electrical Questions › Smoke detectors

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Smoke detectors (Read 21642 times)

JohnD

GDPR opt-out

Smoke detectors
Feb 26^th, 2005, 7:37pm

Thought I'd about got there with my rewire and then someoe said 'Have you fitted the smoke detectors'. Sniff!

I have three linked units to install.

As far as I can see from the instructions I will need a dedicated feed from the CU, which isn't a problem.

Questions.

1. Is a 6amp MCB sufficient?

2. Do I put it on the RCD side or the non RCD side of the CU?

3. Is it o.k. to use 1.5mm cable? And then 3 core and E to link between the detectors?

And then I think I really HAVE finished the rewire!!

Units are Garvan (Screwfix) SS-1238S with 9v battery backup 220 - 240v 55mA in operation.

Thanks

JohnD

« Last Edit: Feb 26^th, 2005, 7:39pm by tjohndavies »

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LSpark

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Re: Smoke detectors
Reply #1 - Feb 26^th, 2005, 9:47pm

[quote author=JohnD link=1109446657/0#0 date=1109446657]Thought I'd about got there with my rewire and then someoe said 'Have you fitted the smoke detectors'. Sniff! [/quote]
Such is life Grin

Quote:

As far as I can see from the instructions I will need a dedicated feed from the CU, which isn't a problem.

Yep, give it it's own feed

Quote:

1. Is a 6amp MCB sufficient?

Yes

Quote:

2. Do I put it on the RCD side or the non RCD side of the CU?

Non RCD side

Quote:

3. Is it o.k. to use 1.5mm cable? And then 3 core and E to link between the detectors?

Yes, 1.5mm 2core and earth for feed to first unit, 3core and earth for the connection between first and all others

Quote:

Units are Garvan (Screwfix) SS-1238S with 9v battery backup 220 - 240v 55mA in operation.

good good, as long as there BS/BS EN marked, certified etc

« Last Edit: Feb 26^th, 2005, 9:48pm by LSpark »

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BigT Trade Member Offline sh*t Happens Posts: 605 Total Thanks: 0 For This Post: 0 Trade: Electrician	Re: Smoke detectors Reply #2 - Feb 27^th, 2005, 1:59pm is one of them a heat detector for the kitchen I hope. T
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #3 - Feb 27^th, 2005, 2:07pm Detectors should be placed with in 3m of any habitable room I think - No need for a detector IN the kitchen 1mm t+e, and 1mm 3core+e would be the best bet - 1.5 is noticeably larger to fit into these small devices!
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BigT Trade Member Offline sh*t Happens Posts: 605 Total Thanks: 0 For This Post: 0 Trade: Electrician	Re: Smoke detectors Reply #4 - Feb 27^th, 2005, 2:37pm Better check your regulations mate a heat detector is required in a kitchen now T
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #5 - Feb 27^th, 2005, 2:41pm Building regs? Since when?
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #6 - Feb 27^th, 2005, 3:02pm Who when how!, bloody reg changes 24/7
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BigT Trade Member Offline sh*t Happens Posts: 605 Total Thanks: 0 For This Post: 0 Trade: Electrician	Re: Smoke detectors Reply #7 - Feb 27^th, 2005, 5:12pm As told you Heat detectors should be fitted in kitchen since 2000. look here on page 5 http://www.tlc-direct.co.uk/Technical/DataSheets/Kidde/Guide_To_RSA.pdf hope that sorts this out. Regards T
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #8 - Feb 27^th, 2005, 5:17pm Yea, that has been around for ages. This is when a kitchen is part of a room, in a bedsit for example. If there is a firedoor between the kitchen and a habitable room(as in most new builds), this can be ignored.
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BigT Trade Member Offline sh*t Happens Posts: 605 Total Thanks: 0 For This Post: 0 Trade: Electrician	Re: Smoke detectors Reply #9 - Feb 27^th, 2005, 5:28pm Look at the drawings on page 2 bruv
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #10 - Feb 27^th, 2005, 6:23pm I stick to what I say. You are looking at a recommendation from a sales team.
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JohnD GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Smoke detectors Reply #11 - Feb 27^th, 2005, 8:17pm No, (sob ) one of them isn't a heat detector (sob ) I didn't know it had to be..... Never mind, one of the smoke detectors will be close enough to run a feed from if Building Control think it is necessary. Thanks for the advice so far. JohnD
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #12 - Feb 27^th, 2005, 8:43pm lol it could be a mistake T, remember the dual earth terminal socket's in ALL homes?
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BigT Trade Member Offline sh*t Happens Posts: 605 Total Thanks: 0 For This Post: 0 Trade: Electrician	Re: Smoke detectors Reply #13 - Feb 28^th, 2005, 5:33pm Have you seen the recommended amount of sockets you should put in a house these days LS even one by a phone socket for recharging. Dont worry though LS you wont need that one though some bugger nicked yours lol sorry couldnt resist tuchay as they say Lol. Regards T
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #14 - Feb 28^th, 2005, 10:04pm
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CWatters

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Re: Smoke detectors
Reply #15 - Mar 3^rd, 2005, 10:32am

[quote author=Lectrician link=1109446657/0#8 date=1109524660]If there is a firedoor between the kitchen and a habitable room(as in most new builds), this can be ignored. [/quote]

Does there _have_ to be a fire rated door between a kitchen and a living room these days? I was planning to fit a glass door but I suspect they aren't classed as fire doors...
http://www.flora-glasdesign.de/

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Smoke detectors Reply #16 - Mar 3^rd, 2005, 4:42pm How often do you see a door during the building control inspection.....and then it becomes an archway! Ask your question again in the building section. You may get a better answer
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