In rural areas, TT with a requirement that new installations have DUPLICATED RCD/RCBO protection. E.G. each circuit on an RCBO and with a from end 100ma time delayed RCD to give a second line of defence.
I live in an area that has many TT installations or TT earthing is required. I always fit an S type 100mA R.C.D. upfront in a separate all insulated enclosure of a new metal box consumer unit with 30mA R.C.B.O.s inside. I come across faulty R.C.D.s on a regular basis.
Z.
That in my view is good practice, and this (or alternative approaches that achieve a similar result of DUPLICATED protection) should be a regulatory requirement for new installations rather than reliance on a single device.
In rural areas, TT with a requirement that new installations have DUPLICATED RCD/RCBO protection. E.G. each circuit on an RCBO and with a from end 100ma time delayed RCD to give a second line of defence.
I live in an area that has many TT installations or TT earthing is required. I always fit an S type 100mA R.C.D. upfront in a separate all insulated enclosure of a new metal box consumer unit with 30mA R.C.B.O.s inside. I come across faulty R.C.D.s on a regular basis.
Z.
That in my view is good practice, and this (or alternative approaches that achieve a similar result of DUPLICATED protection) should be a regulatory requirement for new installations rather than reliance on a single device.
