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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

Parents
  • So, have the Government made the IET and BSI responsible for setting the standards?

    Not really. They've just adopted one particular effort (the 2018 version) - future changes to BS 7671 will NOT change the law - the law remains pointing at the (unamended) 2018 version regardless … unless Parliament/Whitehall decides to adopt some other version instead.  The approach is deliberate - I think they call it being “non-ambulatory” - in that no-one but the government can effectively change the meaning of the law. 

    It's the same with the ESQCR (which curently points, as far as I can tell to BS 7671:2008) and similarly (but non-statute) AD P - which points to BS 7671:2011). (Which might be thought to put people in a difficult situation when they have to comply with several or all of those simultaneously).

    Some will say that compliance with a later edition will naturally comply with earlier editions, but I'm not convinced that the manderins (or indeed laywers) will necessarily agree.

     

    As for the OP's situation, it doesn't seem that difficult to me (although I may be missing something). There are plenty of industry guides to refer to (some of least I'm sure have been prepared with IET co-operation).  I think (but to check) that most list the ommission of 30mA RCD protection as:

    • for sockets (≤32A) - C2 if they're likely to supply equipment outdoors, C3 otherwise
    • for cables concealled in walls - C3
    • for domestic lighting circuits generally - C3
    • for bathrooms - C3 if any required supplementary bonding is present & correct, C2 otherwise,

    (occasionally c.p.c.s. and/or main bonding can satisfy the requirements for main bonding explicit supplementary bonding conductors)

    So as long as you end up with no C2s (or C1s or FIs) you can issue an EICR with a satisfactory.

    To my mind there should be no difference between an EICR produced for a rented properly as to any other produced to the same version of BS 7671. BS 7671 doesn't change between private rented and anything else, so neither should the corresponding EICR. 

       - Andy.

Reply
  • So, have the Government made the IET and BSI responsible for setting the standards?

    Not really. They've just adopted one particular effort (the 2018 version) - future changes to BS 7671 will NOT change the law - the law remains pointing at the (unamended) 2018 version regardless … unless Parliament/Whitehall decides to adopt some other version instead.  The approach is deliberate - I think they call it being “non-ambulatory” - in that no-one but the government can effectively change the meaning of the law. 

    It's the same with the ESQCR (which curently points, as far as I can tell to BS 7671:2008) and similarly (but non-statute) AD P - which points to BS 7671:2011). (Which might be thought to put people in a difficult situation when they have to comply with several or all of those simultaneously).

    Some will say that compliance with a later edition will naturally comply with earlier editions, but I'm not convinced that the manderins (or indeed laywers) will necessarily agree.

     

    As for the OP's situation, it doesn't seem that difficult to me (although I may be missing something). There are plenty of industry guides to refer to (some of least I'm sure have been prepared with IET co-operation).  I think (but to check) that most list the ommission of 30mA RCD protection as:

    • for sockets (≤32A) - C2 if they're likely to supply equipment outdoors, C3 otherwise
    • for cables concealled in walls - C3
    • for domestic lighting circuits generally - C3
    • for bathrooms - C3 if any required supplementary bonding is present & correct, C2 otherwise,

    (occasionally c.p.c.s. and/or main bonding can satisfy the requirements for main bonding explicit supplementary bonding conductors)

    So as long as you end up with no C2s (or C1s or FIs) you can issue an EICR with a satisfactory.

    To my mind there should be no difference between an EICR produced for a rented properly as to any other produced to the same version of BS 7671. BS 7671 doesn't change between private rented and anything else, so neither should the corresponding EICR. 

       - Andy.

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