100mA RCD location TT??

So I believe a 100mA time delay RCD is required for a TT system if a split load board but not an RCBO board, why the difference?? Also any regs reference please?

I have been told that I can just swap out the isolator switch in the board for an RCD however I read that the RCD should be upstream in a plastic enclosure?

Any input appriciated Slight smile

Metal enclosure BTW...

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  • Also, with a TT supply, my employer (a DNO) requires “. . . on a TT System the tails between the M.U.A. meter and the metal clad customer distribution board must pass via a Time Delay 100mA RCD which is to be housed within a class two insulated enclosure before entering the metal clad distribution board via an insulated Gland . . . “. If this is not done, then we will not connect the supply. 

    Regards,

    Alan. 

Reply
  • Also, with a TT supply, my employer (a DNO) requires “. . . on a TT System the tails between the M.U.A. meter and the metal clad customer distribution board must pass via a Time Delay 100mA RCD which is to be housed within a class two insulated enclosure before entering the metal clad distribution board via an insulated Gland . . . “. If this is not done, then we will not connect the supply. 

    Regards,

    Alan. 

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