Mains interlinked alarms

11 Feb 2009
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United Kingdom
I have posted previously on the decision to rip out wireless Fire Angels and replace with hardwire interlinked AICO's.

2 core and earth FP200 fire cable is laid (yes yes, but for what was orginally to be a Grade A, but Grade D then got spec'd later by the FRA.)

Do I understand it correctly that you cannot use just the live and neutral, of the FP200, then use the 'earth' of the FP200 as the interlink, 'borrowing' of an earth, say from a nearby light fitting ... this is not within Regs.
(I note the AICO guide states you cannot use the Earth as the Interlink, is there a reason in addition to the above they state that).
The AICO is a plastic case, but does have an Earth lug, and like a plastic light fittings, an earth should still be present, and terminate at the accessory.

Is the route forward then to take L&N&E from a nearby light fitting, and use one of the insulated cores of the FP200 as the interlink, how should one leave the other two cores, I don't want to see them snipped back. Should they be terminated with say terminal strips and then have them poked back into the void.

The lighting loop in one of the flats is not in the ceiling roses, but behind the light switchs :(

Thoughts appreciated.
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FP200 is typically used in 24V DC systems, although it is also used in mains applications (e.g. the supply to the fire alarm panel, via a red keyswitched FCU).

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