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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  • I am just confused as to why the likelyhood of a stray tail or bus bar doesnt affect a RCBO board only a split load board?

    One of the problems with a split board is the connections between the incomer and the RCCBs - usually just bits single insulated wires which are usually touching the metal case (or c.p.c.s/earth bar) - without ADS that doesn't give us the usual minimum of a double fault to danger, as we're relying on just one layer of insulation.

       - Andy.

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  • I am just confused as to why the likelyhood of a stray tail or bus bar doesnt affect a RCBO board only a split load board?

    One of the problems with a split board is the connections between the incomer and the RCCBs - usually just bits single insulated wires which are usually touching the metal case (or c.p.c.s/earth bar) - without ADS that doesn't give us the usual minimum of a double fault to danger, as we're relying on just one layer of insulation.

       - Andy.

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