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

Adam Seddon

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?

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  • 0

    Because the RCD socket outlets were not listed in BS7671 as being suitable to provide additional protection, as you should all know.

    But now they are, which again you should know. 

    With due respect, the whole team seems to need to get up to date. 

  • 0 in reply to Sparkingchip

    Even for the short time that was the case  is was never a reason to ban them - a reason not to solely rely on them, maybe, but not a reason to ban.

    And this is not about that, but about RCDs in plugs and sockets on extension cables and appliances.

    It is a bit worrying that it is a question apparently written to assess electrical competence, and makes one wonder about the competence of whoever set the questions.

    Mike.

  • 0 in reply to Sparkingchip
    Sparkingchip said:
    But now they are, which again you should know. 

    Although, they would have to be Type A to meet the requirement in Regulation 551.3.3 that Type AC RCDs may only be used to supply fixed equipment (and even then where it is known that the load current contains no DC components).

    And it seems that BS 7071 RCDs are likely to be Type AC (the standard has not been updated since 1992).

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  • 0 in reply to Sparkingchip
    Sparkingchip said:
    But now they are, which again you should know. 

    Although, they would have to be Type A to meet the requirement in Regulation 551.3.3 that Type AC RCDs may only be used to supply fixed equipment (and even then where it is known that the load current contains no DC components).

    And it seems that BS 7071 RCDs are likely to be Type AC (the standard has not been updated since 1992).

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