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100mA RCDs TT system

Nikkid
Afternoon all,

What is the stance on using 100mA RCDs for TT systems now?

I was under the impression that they are no longer required as long as all circuits were protected by a 30mA RCD within the consumer unit (which in this case they will be).

Just looking for some clarity. 


Thanks! 

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  • 0
    UKPN:

    As our poster knows, I am talking about an all steel box, but let's not let the facts get in the way of a good topic.

    Regards, UKPN


    The point I'm trying to make is that a steel box does not necessarily mean that something is entirely class I - in the case of steel consumer units some manufacturers provide 'insulation kits' that provide double/reinforced insulation to the incoming tails - thus removing the need for an external upstream RCD where there is an RCD incomer or the internal construction is double double/reinforced insulation up to the RCBOs etc.


    Personally I'm not entirely convinced by some of those kits, and so would prefer an upstream RCD in its own insulating enclosure - but I can only claim that as a personal preference, not a legal requirement.


        - Andy.


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  • 0
    UKPN:

    As our poster knows, I am talking about an all steel box, but let's not let the facts get in the way of a good topic.

    Regards, UKPN


    The point I'm trying to make is that a steel box does not necessarily mean that something is entirely class I - in the case of steel consumer units some manufacturers provide 'insulation kits' that provide double/reinforced insulation to the incoming tails - thus removing the need for an external upstream RCD where there is an RCD incomer or the internal construction is double double/reinforced insulation up to the RCBOs etc.


    Personally I'm not entirely convinced by some of those kits, and so would prefer an upstream RCD in its own insulating enclosure - but I can only claim that as a personal preference, not a legal requirement.


        - Andy.


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