Connecting linked fire alarms
Hi, I have installed two interlinked fire alarms as part of a renovation
project. However they are not linked at present just have two white cables, coming from each one. Is it ok to take a single core out of some 1mm/1.5mm2 cable I have laying around as I cant seem to find a single core that's not red or black, and I have three way cable with a different colour core which I could use. Thanks John |
Do you mean smoke alarms, interlinked to each other?
Fire alarms are as used in commercial buildings with a central panel monitoring? If so suggest you d/load one of installers manual to give you general guidance http://www.smoke-alarms.co.uk/alarmfeatures.shtml Select "alarm features/manuals" on top navigation bar You can only interconnect with 3 core & earth. These manuals are for UK market only. |
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sorry yeah meant smoke alarms doh. It was early when I posted it
wrote in message ups.com... Do you mean smoke alarms, interlinked to each other? Fire alarms are as used in commercial buildings with a central panel monitoring? If so suggest you d/load one of installers manual to give you general guidance http://www.smoke-alarms.co.uk/alarmfeatures.shtml Select "alarm features/manuals" on top navigation bar You can only interconnect with 3 core & earth. These manuals are for UK market only. |
John Borman wrote:
Hi, I have installed two interlinked fire alarms as part of a renovation project. However they are not linked at present just have two white cables, coming from each one. Is it ok to take a single core out of some 1mm/1.5mm2 cable I have laying around as I cant seem to find a single core that's not red or black, and I have three way cable with a different colour core which I could use. Just run the whole cable and only use one of the cores. If you want you can sleave the wire at each end with a "thrid" colour to indicate it is not an ordinary mains connection. (With my ones, I ran power from the CU to the first, and then three core and earth from there to each of the others. That way you get the power and the link delivered to each alarm in a single cable. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
I've read it is ok to run them of the lighting main is this ok or is it best
to run them from the CU "John Rumm" wrote in message ... John Borman wrote: Hi, I have installed two interlinked fire alarms as part of a renovation project. However they are not linked at present just have two white cables, coming from each one. Is it ok to take a single core out of some 1mm/1.5mm2 cable I have laying around as I cant seem to find a single core that's not red or black, and I have three way cable with a different colour core which I could use. Just run the whole cable and only use one of the cores. If you want you can sleave the wire at each end with a "thrid" colour to indicate it is not an ordinary mains connection. (With my ones, I ran power from the CU to the first, and then three core and earth from there to each of the others. That way you get the power and the link delivered to each alarm in a single cable. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
"John Borman" wrote in message ... I've read it is ok to run them of the lighting main is this ok or is it best to run them from the CU If you can supply them separately from other appliances, then all the better, but convenience may dictate a supply from the lighting circuit. If it's a huge job to run a supply directly back to the consumer unit, then tapping into a nearby lighting junction box would be OK. But it is better to run a separate constant, uninterrupted supply to them. |
Best practice is to tap off local lighting circuit as if on dedicated
circuit [which AC only alarms have to be] is a chance that if alarms play up, householder may switch off that circuit breaker. If lighting is off they'd pretty soon notice. |
Hi, I have installed two interlinked fire alarms as part of a renovation
project. However they are not linked at present just have two white cables, coming from each one. Is it ok to take a single core out of some 1mm/1.5mm2 cable I have laying around as I cant seem to find a single core that's not red or black, and I have three way cable with a different colour core which I could use. No. I'd use the entire cable and ignore unused conductors, or relay with 3 core+E. I wouldn't want to run a single cable, except in conduit, as it only has a single layer of insulation. Christian. |
cheers for that what I may consider doing is connecting the upstairs one to
the lighting circuit up there then using 3core +E to connect this one to the one downstairs gonna have a fun day tomoz. Also, (I know I will prolly be condemned for asking this, or just told to get an leccy in) after rewiring the lighting circuit using the loop in system I am stumped by a two gang two way set up. This is the situation, downstairs has a 2 gang light switch with one switch operating one down stairs, and the other one operating two lights upstairs. Ok the wiring isn't that much of a problem, I have two lots of 3C+E running from the switch down stairs to the switch upstairs. Downstairs the light switch has the approp switch cable for the downstairs light. Upstairs its has the two 3C+E cables plus the switch cable from upstairs (Actually it has two switch cable for the two upstairs lights as it was originally a 3 Gang switch and I'm changing it to a 2 Gang one) Ok so there's all the cables explained, the faceplates have obviously 6 connectors L1, L2 and L3 ??? (Its this third one that I'm a bit confused about is this what is usually marked COM?) Am I correct in thinking that for two way op. the linking cable is connected as follows: L1=Yellow L2=Blue Com/L3=Red with the circuit cable connected as follows L2=Switched Red L1=Red Thanks for any help "Christian McArdle" wrote in message . net... Hi, I have installed two interlinked fire alarms as part of a renovation project. However they are not linked at present just have two white cables, coming from each one. Is it ok to take a single core out of some 1mm/1.5mm2 cable I have laying around as I cant seem to find a single core that's not red or black, and I have three way cable with a different colour core which I could use. No. I'd use the entire cable and ignore unused conductors, or relay with 3 core+E. I wouldn't want to run a single cable, except in conduit, as it only has a single layer of insulation. Christian. |
John Borman wrote:
Ok so there's all the cables explained, the faceplates have obviously 6 connectors L1, L2 and L3 ??? (Its this third one that I'm a bit confused about is this what is usually marked COM?) Probably... but if you took the switch off you could soon test it with a multimeter (or torch bulb and battery) to make sure. The COM postion (whichever it is) will be connected to one contact with the switch in one position, and the other when you throw the switch. Am I correct in thinking that for two way op. the linking cable is connected as follows: L1=Yellow L2=Blue Com/L3=Red Not sure there is actually a standardised way of choosing which colour gets used where. Personally I use the red for the COM connection. (You ought to always sleave the others with red since they are all lives). with the circuit cable connected as follows L2=Switched Red L1=Red Sounds right assuming L3 is COM. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
"John Rumm" wrote
| If the alarms are being fitted under requirement of building regs (say | because they are required as a result of the addition of a third storey | to the building - i.e. loft conversion), then they must be on their own | circuit, and they must also have a battery backup ^^^ s/and/or Very important :-) Owain |
Owain wrote:
"John Rumm" wrote | If the alarms are being fitted under requirement of building regs (say | because they are required as a result of the addition of a third storey | to the building - i.e. loft conversion), then they must be on their own | circuit, and they must also have a battery backup ^^^ s/and/or Very important :-) Well spotted! I over egged the regulations a tad there.... -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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