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The last remaining domestic circuits without RCD protection.

Sparkingchip
I prepared an EICR this morning for a two bed flat.


The peak installation has a 30 mA RCD main switch, which surprisingly despite being more than ten years old is a type A, so no RCD issues there.


The off-peak supplies two storage heater circuits run in surface mounted plastic mini trunking without RCD protection, so again no RCD issues. If I were installing the storage heaters with new circuits I would install RCD protection, but there’s no reason to condemn an existing installation.


I am just pondering exactly what can be installed in a domestic installation now without any RCD protection with the 18th Edition of the Wiring Regulations making them a requirement on lighting circuits there cannot be much left on the list.


 Andy B.
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    David Strachan:

    Do you realise that if adding a spur to be RCD protected on a non RCD protected circuit then you must substitute an existing point for an RCD then connect your spur to it.

    it`s the only way to make the new addition comply via the RCD route.




    I see what you mean, but I am not sure that I agree.


    Assuming that we are discussing domestic premises, if it is an extension to a final circuit which the supplies two* or more luminaires, the whole circuit would need to be RCD protected (411.3.4). However, if it is any other final circuit, and the extension is supplying one or more sockets, it is only the socket which needs to be RCD protected provided that the new cable is not buried less than 50 mm deep, etc.


    *On a very strict interpretation: 411.3.4 refers to "luminaires" in the plural.

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  • 0

    David Strachan:

    Do you realise that if adding a spur to be RCD protected on a non RCD protected circuit then you must substitute an existing point for an RCD then connect your spur to it.

    it`s the only way to make the new addition comply via the RCD route.




    I see what you mean, but I am not sure that I agree.


    Assuming that we are discussing domestic premises, if it is an extension to a final circuit which the supplies two* or more luminaires, the whole circuit would need to be RCD protected (411.3.4). However, if it is any other final circuit, and the extension is supplying one or more sockets, it is only the socket which needs to be RCD protected provided that the new cable is not buried less than 50 mm deep, etc.


    *On a very strict interpretation: 411.3.4 refers to "luminaires" in the plural.

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