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RCD Protection For Old Installations

Former Community Member
Former Community Member

Hey there, 

Would like to hear your thoughts on the case. 

If the installation from the 70s or 80s with old mem board has no rcd protection for neither sockets nor lights (with metal front plate switches, which are connected to CPC), taking into consideration that the installation was working cheerfully since the old days till today and all Zs values are within the range of the installed breakers and overall good condition. Would this require an upgrade to rcd protection as of the 18th edition or would class as C3 as of best practice guide 4 suggest on eicr? 

How would you approach the situation?

Regards, 

Karolis

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    If you think 314.1 disallows a single RCD for an installation you should look carefully. Why do you suspect “excessive protective conductor currents not due to a fault” in a domestic installation 314.1 (iv)?  The usual excuse of "inconvenience" does not match that does it? Installations do not have this problem in most cases, the PE current in mine is less than 1 mA and I have quite a lot of electronics. I would also like to point out that if you can get inside the CU you can add an external RCD, the tails MUST be accessible, although this may require a degree of skill.

    If the landlord is prepared to pay for you to fit a new CU and correct all discrepancies from BS7671 blue copy, then fine, but many may not. Then you can issue a new EIC, but surprisingly few actually do this correctly. There are NO C3 or whatever on a new EIC. You will note that the definition of installation is the whole system, writing “New CU” is in my view totally unsatisfactory. 

    Electrical Installation: An assembly of associated electrical equipment having co-ordinated characteristics to fulfill specific purposes.

    In other words, the cables, accessories, and everything else to provide electrical services in the property.

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  • 0

    If you think 314.1 disallows a single RCD for an installation you should look carefully. Why do you suspect “excessive protective conductor currents not due to a fault” in a domestic installation 314.1 (iv)?  The usual excuse of "inconvenience" does not match that does it? Installations do not have this problem in most cases, the PE current in mine is less than 1 mA and I have quite a lot of electronics. I would also like to point out that if you can get inside the CU you can add an external RCD, the tails MUST be accessible, although this may require a degree of skill.

    If the landlord is prepared to pay for you to fit a new CU and correct all discrepancies from BS7671 blue copy, then fine, but many may not. Then you can issue a new EIC, but surprisingly few actually do this correctly. There are NO C3 or whatever on a new EIC. You will note that the definition of installation is the whole system, writing “New CU” is in my view totally unsatisfactory. 

    Electrical Installation: An assembly of associated electrical equipment having co-ordinated characteristics to fulfill specific purposes.

    In other words, the cables, accessories, and everything else to provide electrical services in the property.

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