Discuss smoke alarm wiring. in the Security Alarms, Door Entry and CCTV (Public) area at ElectriciansForums.net

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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
 
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
 
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
 
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.
 

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