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18th edition niceic-elearn question

MikeWilson

Looking for help on this question as I am completely stumped, every what seems to be feasible answer is apparently wrong.

   

Can anybody please advise? 

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  • 0

    I just recounted and it is definitely 18.

    The top half of the consumer unit has all RCBOs supplied from the main switch and six are turned off.

    The bottom half of the consumer unit has twelve MCBs all supplied from the RCD, well they would be if the busbar had been installed, but the busbar is missing so all twelve are switched off.

    6 + 12 = 18

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  • 0

    I just recounted and it is definitely 18.

    The top half of the consumer unit has all RCBOs supplied from the main switch and six are turned off.

    The bottom half of the consumer unit has twelve MCBs all supplied from the RCD, well they would be if the busbar had been installed, but the busbar is missing so all twelve are switched off.

    6 + 12 = 18

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