Discuss EICR today Mains smoke detectors interlinked in the Electrical Forum area at ElectriciansForums.net

loz2754

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Arms
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The fundamental principle behind fire detection is all about early warning. By not interconnecting, you're not making use of the early warning that interlinking can provide.

The principle works the same in buildings on the same site. If you've ever been to a large site (hospital is the best example) then you'll likely hear 2 alarms, 1 for fire in the immediate area (get out now) and 1 for fire in adjacent areas (prepare to evacuate). Obviously in domestic systems we don't have the dual tone (for fire) but the fundamental principle is the same; early warning.

Personally I would interlink and educate the user. You coul use a -1 system in place of -6 if you wanted the 2 tone function found on -1 systems.
I appreciate this principle. But in this situation, it is stated that the flats are self contained and independent from each other, other than being owned by the same landlord.
It would be like me and my neighbour, and his neighbour 2 doors down, all having interlinked smoke alarms. All supplied electrically from my house.
At least that's what I understood from the OP.
 

Lister1987

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Trainee
I appreciate this principle. But in this situation, it is stated that the flats are self contained and independent from each other, other than being owned by the same landlord.
It would be like me and my neighbour, and his neighbour 2 doors down, all having interlinked smoke alarms. All supplied electrically from my house.
At least that's what I understood from the OP.
Fair point, what would does the FRA say? Communal areas should be on a -1 system with Sounders near each flat in any case, so you could make use of that extending into each flat with 2 sounds (immediate evac or prep to evac).

Other factors may come into play with the occupants (elderly, hard of hearing) with may favour linking all alarms.

Alarm system should come from the communal supply in a HMO/Shared building at any rate.
 
If the smoke alarms are powered from a different supply to the building they are in, then there should at least be warning notices that there is more than one source of supply.
Though I don't see the purpose or reasoning behind having smoke alarms interlinked between separate buildings.
Further investigation would be beneficial.
Interlinked smoke alarms don’t necessarily have one source of supply. My sensors are powered from two separate circuits off the CU and law in Scotland allows mains powered and lithium 10 year battery detectors to be interconnected.

The recent law insists that all detectors within a house are interlinked.
 
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Not sure what the laws are down south but up here as long as they're interlinked you don't need a permanent feed, just 10yr lithum-ion battery.
Radio interlink also works under the Scottish rules
 
This is a very interesting discussion about the interlinking of different types of alarms but I think the OP's query was more to do with having the same circuit running through several properties. I had a similar thread a while ago although it was to do with external lighting in a commercial situation. Most of the advice on here was to fit labels in all of the properties which the circuit was present in stating where to isolate it.
 

loz2754

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Arms
This is a very interesting discussion about the interlinking of different types of alarms but I think the OP's query was more to do with having the same circuit running through several properties. I had a similar thread a while ago although it was to do with external lighting in a commercial situation. Most of the advice on here was to fit labels in all of the properties which the circuit was present in stating where to isolate it.
As I said in my post number 7.
Perhaps the OP could chime in to help with some clarification...
 
If the smoke alarms are powered from a different supply to the building they are in, then there should at least be warning notices that there is more than one source of supply.
Though I don't see the purpose or reasoning behind having smoke alarms interlinked between separate buildings.
Further investigation would be beneficial.
Thank you, this is the case. Person in one flat told me they ignore it and put it down to false alarm , not knowing that all buildings are interlinked just find it mad, if 24v fire alarm system would not question it but mains really.
Thanks for all the replies stevie g
 

Mike Johnson

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Esteemed
Arms
Good evening all
3 buildings :
1 Gf flat and 1St fl flat year 1915
2nd 6 flats year 1980
3rd cottage year 1900
They are separate buildings probabley 2in between them, 1 landlord owns all,
I ve done EICR on 1st building and 1 flat in 2nd building and found that the mains smoke detectors are interlinked hard wired between buildings no local isolation in buildings and not come across the power source that supplies them.
? What code
? Am I going mad is this allowed


I'm still trying to get my head around the statement that there is only 2in between the buildings?
 
I'm still trying to get my head around the statement that there is only 2in between the buildings?
Op, do you mean there are Aico hard wired and interlinked smoke alarms in a house that is now two flats, and then a few doors down the street with neighbours in between, there is another house converted into flats with smoke alarms on the same circuit? And you do not know what house even powers this circuit?
 
Op, do you mean there are Aico hard wired and interlinked smoke alarms in a house that is now two flats, and then a few doors down the street with neighbours in between, there is another house converted into flats with smoke alarms on the same circuit? And you do not know what house even powers this circuit?
3 buildings next to each other nobody in between and yes to rest
 

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