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RCCB & Switch Overload Protection (536.4.202)

sparkiemike
Just trying to get my head around regulation 536.4.202, particularly the last line.


“However overload protection shall not solely be based on the use of diversity factors of the downstream circuits. To achieve overload protection of RCCBs or switches, the rated current of the OCPD shall be selected according to the manufacturers instructions”.


If I understand it correctly in a the sum of the downstream MCBs should not exceed the current rating of the RCD. So in most dual RCD split load boards the RCDs would need to be rated at 100A


Is this correct, because there seem to be a lot of "pre-populated" boards still being sold with 63A RCDs? 


How are others interpreting this new reg?
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  • 0
    Thanks for the replies, I got this reply from BG

    Hi, thank you for your product enquiry. Some manufacturers have interpreted this regulation stated in BS 7671 about the diversity being used solely. Our board is still compliant as it complies to BS 61439-3 regulations as testing is conducted using 100A as a maximum load and this is split between the two RCCBs inside the board. This has also been tested and verified by third parties.





    Hager's interpretation is easier to understand, but the cynic in me thinks this simply to differentiate their product to justify their higher prices. That said I do like working with the Hager boards. I am waiting for a reply from MK as well.

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  • 0
    Thanks for the replies, I got this reply from BG

    Hi, thank you for your product enquiry. Some manufacturers have interpreted this regulation stated in BS 7671 about the diversity being used solely. Our board is still compliant as it complies to BS 61439-3 regulations as testing is conducted using 100A as a maximum load and this is split between the two RCCBs inside the board. This has also been tested and verified by third parties.





    Hager's interpretation is easier to understand, but the cynic in me thinks this simply to differentiate their product to justify their higher prices. That said I do like working with the Hager boards. I am waiting for a reply from MK as well.

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