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RCDs for both Fault & Additional Protection

PG
BS7671 states for Additional Protection [415.1.2] - "The use of RCDs is not recognised as a sole means of protection and does not obviate the need to apply one of the protective measures specified in Sections 411 to 414." - These methods being methods of protection against shock - ADS, Double Insulation, Separation & SELV/PELV.


531.3.6 states " - - - - - - -RCD - - --  - - -may provide fault protection and additional protection simultaneously."


This appears to be inconsistent. Is 531.3.6 meant to apply to only one type of neutral  earthing system?


Regards

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  • 0

    geoffsd:

    Isn't the point that


    415.1.2 implies that OPDs must be used and 


    531.3.6 states that that is not the case?

    I think PG is asking if this only applies to TT instalations.




    I don't think 415.1.2 implies that OPDs must be used, rather that  if you use RCDs for fault protection you still need to use one of the following methods


    • ADS (earthing, bonding and basic protection) (reg 411) or

    • Double or reinforced protection (reg 412) or

    • Electrical separation (reg 413) or

    • SELV or PELV (reg 414)




     

Reply
  • 0

    geoffsd:

    Isn't the point that


    415.1.2 implies that OPDs must be used and 


    531.3.6 states that that is not the case?

    I think PG is asking if this only applies to TT instalations.




    I don't think 415.1.2 implies that OPDs must be used, rather that  if you use RCDs for fault protection you still need to use one of the following methods


    • ADS (earthing, bonding and basic protection) (reg 411) or

    • Double or reinforced protection (reg 412) or

    • Electrical separation (reg 413) or

    • SELV or PELV (reg 414)




     

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