installing a wired smoke alarm with interlinking heat alarm

[craig3217]

Hi
read the instructions, want to hard wire a smoke alarm and interlinking heat alarm to my consummer unit. however nothing in instructions about this, understand i need 3 core and earth cable, brown and blue to normal place in consummer unit and earth, where do i put the white cable at beginning (interlinking cable)

 

[PrenticeBoyofDerry]

The two core at CU would be brown (line), blue (neutral).
Your three core at alarms will be brown (line), black(interlink) this is then sleeved brown, grey(neutral) this is then sleeved blue.
Depending on the type of smoke alarm you have the connected wire of them could be different, if you have to terminate the connector plug/socket and if you have brown, blue, white the white would generally be used as the interlink, but this should be documented in the fitting instruction that come with the alarms.

Please note the CPC/earth (yellow and green sleeving) should be terminated at all points of the alarm system.

 

[OwainDIYer]

you put the unused core at the CU into a piece of 'choc block' terminal strip, and label it accordingly.

 

[Risteard]

The two core at CU would be brown (line), blue (neutral).
black(interlink) this is then sleeved brown

Black would be more appropriate as it is not running at 230V. BS 5839 permits black as a colour and the 230V line should be distinguishable.

 

[compspark]

In My exxperience of fitting these interlinked alarms, the white goes on to the next sensor and so on so that if smoke alarm goes off in kitchen in the night they will all Sound due to the white wire!!

 

[Lectrician]

In My exxperience of fitting these interlinked alarms, the white goes on to the next sensor and so on so that if smoke alarm goes off in kitchen in the night they will all Sound due to the white wire!!

I think that is agiven....

The black used for the interlink should not be sleeved brown, it should be left black to identify it as ELV - The signalling is ELV as it has to still interlink during a power failure.