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Explain why RCDs fitted into extension leads or incorporated into plugs are forbidden

this question is inside a mentor guide at the place i work for someone to be signed off as a fully competent electrician.

none of us can think of any reason why this may be the case, can anyone else?

Parents
  • RCDs do not rely on a CPC connection  - indeed the 'earth wire' does not even pass through the business part. They respond to the difference in L and N  current. That way they also  respond to live earth shocks that return via terra-firma, not just the green and yellow wire.

    I presume there is some odd situation, perhaps with high earth leakage or for equipment where sudden power  loss would be dangerous, where they may be forbidden, but without further explanation the statement  is simply not true. I suggest you appeal to the authors for clarification about when this ban applies, or get the offending paragraph deleted.

    (I can imagine someone saying that they shall not be relied upon as the sole means of protection but that is not the same as a ban...)

    Mike.

Reply
  • RCDs do not rely on a CPC connection  - indeed the 'earth wire' does not even pass through the business part. They respond to the difference in L and N  current. That way they also  respond to live earth shocks that return via terra-firma, not just the green and yellow wire.

    I presume there is some odd situation, perhaps with high earth leakage or for equipment where sudden power  loss would be dangerous, where they may be forbidden, but without further explanation the statement  is simply not true. I suggest you appeal to the authors for clarification about when this ban applies, or get the offending paragraph deleted.

    (I can imagine someone saying that they shall not be relied upon as the sole means of protection but that is not the same as a ban...)

    Mike.

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