Smoke Alarm Wiring

[Pensdown]

This ones got me scratching my head.

As part of a PIR the smoke alarm wiring was inspected.

The installer used Kiddie heat and smoke detectors and round plaster board boxes to house the connections - nice job.

The 1st head was wired directly from the ground floor lighting MCB.

The earth in the supply cable was sleeved GY and connected to the CU earth bar. At the head the earth went into a 5amp choc block.

The other heads were then interlinked using 1.5mm T&E with the earth sleeved white and connected to the white cable from the Kiddie head.

Questions

Is the white cable from the Kiddie head classed as a functional earth? If not why is it white?

In the context of a PIR is the above unsafe?

Does it break any regulations?

Would you code it and if yes, what code?

 

[GaryMo]

Unless there's a cpc present (at the interlinked heads) then it won't comply with 411.3.1.1

Not sure what the white conductor is, maybe the interlinking 3rd core?

Shouldn't a bare cpc not only be used for that very purpose - a cpc?

I would suggest a code 2.

 

[ColJack]

no, that'll be the interlink.. and the sparky was a cowboy...

 

[flameport]

The white from the alarm is the interlink.

It should have been done in 3core and earth, with coloured sleeving:
Brown - live, no sleeve
Grey - neutral, blue sleeve
Black - interlink
Bare - earth, g/y sleeve.

A 4 way terminal block is used, the alarm only connects to 3 of them - no earth to the alarms.