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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? 

Parents
  • 0

    Fifteen are isolated if it is a TN earthing system, three on the top row by removing the live conductor and terminating them into the earth bar and twelve on the bottom row by removing the live busbar.

    The question is clear as mud.

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  • 0

    Fifteen are isolated if it is a TN earthing system, three on the top row by removing the live conductor and terminating them into the earth bar and twelve on the bottom row by removing the live busbar.

    The question is clear as mud.

Children
  • 0 in reply to Sparkingchip

    Well I`d go by the two words "switched off" meeself, in the switch is in the off position. If an upstream switch (or RCD) are switched off then the circuits outging are switched off but the MCBs/RCBOs themselves are actually switch on or off as shown. others might disagree

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