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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

Parents
  • 0
    Perhaps to summarise:


    A 30mA RCD alone only provides additional (supplementary) protection.


    To provide ADS you need not only a disconnection device (which can be an RCD or OPD) but also a c.p.c. connecting all exposed-conductive-parts to suitable means of earthing and co-ordination between earth loop impedance and the disconnection device's operating characteristics (and possibly main protective bonding as well).


    Using an RCD on its own is not considered sufficient protection from electric shock.


      - Andy.
Reply
  • 0
    Perhaps to summarise:


    A 30mA RCD alone only provides additional (supplementary) protection.


    To provide ADS you need not only a disconnection device (which can be an RCD or OPD) but also a c.p.c. connecting all exposed-conductive-parts to suitable means of earthing and co-ordination between earth loop impedance and the disconnection device's operating characteristics (and possibly main protective bonding as well).


    Using an RCD on its own is not considered sufficient protection from electric shock.


      - Andy.
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