smoke alarm wiring.

[tony clark]

went to change three smoke alarms today and found they were wired in 1.5 t&e useing the cpc as the interconect link wire.
would you class this as a c1 / c2
i was thinking c1,
any thoughts

 

[buzzlightyear]

considering they are class 2 then a cpc is not required ,but I would put down c1 ,but thats only me .

 

[westward10]

Are you changing smoke detectors or carrying out an EICR. Personally I would not have changed them if the cpc were acting as the interconnection.

 

[tony clark]

considering they are class 2 then a cpc is not required ,but I would put down c1 ,but thats only me .

i agree with you i would had used three core and earth and terminated the cpc

 

[westward10]

So what are you doing/done.

 

[tony clark]

Are you changing smoke detectors or carrying out an EICR. Personally I would not have changed them if the cpc were acting as the interconnection.

was suposed to have change them but refused to as customer said it was ok when he had a eicr done 5 years ago, not for me back in van on to the next one

 

[buzzlightyear]

i would have told the client my names is not cowboy bill.

 

[buzzlightyear]

went to change three smoke alarms today and found they were wired in 1.5 t&e useing the cpc as the interconect link wire.
would you class this as a c1 / c2
i was thinking c1,

the begging question why are you asking in the first place .,asking which code .

 

[westward10]

was suposed to have change them but refused to as customer said it was ok when he had a eicr done 5 years ago, not for me back in van on to the next one

Good for you.

 

[tony clark]

just wondering as not been working for a while as i had a hart attack / and a stroke,

 

[westward10]

I am not sure the voltage of the interlink but the requirement would be for a multicore cable that all conductors are insulated for the highest contained voltage, a bare cpc does not satisfy this requirement.

 

[Charlie_]

How old were the detectors?
>10 years then they need to be replaced, replacements being mains rf units..
I don’t see how the using the cpc can be a C1 or C2?
The interconnection is only 9 volts.
I would code it as a C3

 

[Andy5678]

change all detectors to radio linked and use bare wire as the CPC

 

[buzzlightyear]

change all detectors to radio linked and use bare wire as the CPC

back in van on to the next one

ELVIS HAS LEFT THE BUILDING .

 

[richy3333]

I'd class it a C2. Where ADS is used the circuit requires a CPC. See 411.3.1.1 and GN8.

'A CPC shall be run to and terminated at each point in the wring and at each accessory point except a lamp holder having no exposed conductive parts and suspended from such a point'

The detectors may well be class 2 etc but the circuit still requires earthing.