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Shower with no RCD or supplementary bonding

MrJack96

I have been round to a relatives flat and seen he has an old Wylex board with MCBs. His bathroom has no supplementary bonding from what I can see and no RCD protection for his electric shower. how potentially dangerous is this? I know the circuits are fairly short and can see main bonding in place Can only really think if the R2 values are low enough touch voltages should end up being kept low? 

 

 

 

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    If the c.p.c.s/bonding collectively satisfy the 50V/Ia rule, I think we can say the the requirements for supplementary bonding are met. That's not to say that touch voltages will always remain low (or below 50V) during all possible L-PE faults - but that the duration and touch voltages will be co-ordinated to limit harm, so you'd seem to have reasonable protection from the classic 'fault of negligible impedance'. Without 30mA RCDs there might be some small risk from ‘direct contact’ type problems - e.g. damaged equipment with exposed live parts or faults to a victim not involving the the PE system - e.g. due to a build up of damp/corrosion products - but that shouldn't really happen if things are decently maintained.

       - Andy.

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    If the c.p.c.s/bonding collectively satisfy the 50V/Ia rule, I think we can say the the requirements for supplementary bonding are met. That's not to say that touch voltages will always remain low (or below 50V) during all possible L-PE faults - but that the duration and touch voltages will be co-ordinated to limit harm, so you'd seem to have reasonable protection from the classic 'fault of negligible impedance'. Without 30mA RCDs there might be some small risk from ‘direct contact’ type problems - e.g. damaged equipment with exposed live parts or faults to a victim not involving the the PE system - e.g. due to a build up of damp/corrosion products - but that shouldn't really happen if things are decently maintained.

       - Andy.

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