From the advice gathered from this site, my final set up for my timber shed electrics is as follows. I will only be running low drain devices, but on the occasions of using mitre saws, heaters etc, these will only be used exclusively.
PME house supply
32mcb in house CU ->
4mm t&e ->
junction box with 30A choc block ->
22m of 4mm SWA 3 core cable underground (with CW glands, though junction boxes will be inside house and shed)->
junction box with 30A choc block ->
4mm t&e ->
shed CU (with 63A RCD, 6 and 16 MCB)
From the shed CU, I will be running 2 double sockets, and 4 x 50W mains voltage downlighters.
The SWA cable armour is earthed at the house and garage end, and also the 3rd core of SWA is connected right through from house CU to shed CU as an earth.
I have read that it is not advisedable to use a PME earth for a shed because of the broken neutral scenario, and to use an earth rod instead.
My questions are;
If all this work was done last summer, does Part P still apply if I introduce an earth rod at the shed to this setup, then disconnect the house earth at the the shed? The shed is approx 12m from house.
Secondly, if the broken neutral scenario arose, would testing the shed RCD not show this up? Does the shed RCD not require a working earth to function?
Many thanks for any advice given.
PME house supply
32mcb in house CU ->
4mm t&e ->
junction box with 30A choc block ->
22m of 4mm SWA 3 core cable underground (with CW glands, though junction boxes will be inside house and shed)->
junction box with 30A choc block ->
4mm t&e ->
shed CU (with 63A RCD, 6 and 16 MCB)
From the shed CU, I will be running 2 double sockets, and 4 x 50W mains voltage downlighters.
The SWA cable armour is earthed at the house and garage end, and also the 3rd core of SWA is connected right through from house CU to shed CU as an earth.
I have read that it is not advisedable to use a PME earth for a shed because of the broken neutral scenario, and to use an earth rod instead.
My questions are;
If all this work was done last summer, does Part P still apply if I introduce an earth rod at the shed to this setup, then disconnect the house earth at the the shed? The shed is approx 12m from house.
Secondly, if the broken neutral scenario arose, would testing the shed RCD not show this up? Does the shed RCD not require a working earth to function?
Many thanks for any advice given.