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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.
 
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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

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

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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
 

richy3333

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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.
 

James

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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 am sure some detectors just switch 230v to the link wire when they are set off.
 
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
Yes but doesnt the cable itself have to have a cpc
 

Wilko

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It is an interesting thing - if I have it correctly - each point in the circuit is to have an earth available (Richy’s 411.3.1.1 ) and if it’s ADS have a cpc run in “immediate proximity” to the lives ( Reg 543.6.1 ).
So to my understanding, Reg 132.16 tells me if they don’t want it fixed I should join @tony clark back in the van. Any tea Tony?
 
It is an interesting thing - if I have it correctly - each point in the circuit is to have an earth available (Richy’s 411.3.1.1 ) and if it’s ADS have a cpc run in “immediate proximity” to the lives ( Reg 543.6.1 ).
So to my understanding, Reg 132.16 tells me if they don’t want it fixed I should join @tony clark back in the van. Any tea Tony?
....and if neutrals are taken as ‘live’ then all those houses where a separate neutral without CPC has been run around the lights.....

How big is this van?
 

littlespark

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Cpc means circuit protective conductor, meaning the entire circuit, not just the outlet point.
Using the cpc for anything else is wrong.

You would have to label the same as old lighting circuits without cpc; class II only, no metal etc
 

sparks1234

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For goodness sakes, use the T & E as a feed and tell the client that they need radio links, if they are not available for that model as they are 7 years old then replace them. At the end of the day you did not install them and use the CPC as the interconnecting link, even if it is extra low voltage on many of them, all you can do is give the client your knowledge to keep them safe, its up to them if they choose to use A N other to reuse the existing wiring
 
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