E
elephant
Hi, I`m hoping someone can advise me the best way to provide a power supply to a (large) shed at my self build project.
I should state that it is in Scotland (i.e. no part P) and Building Control have granted warrant for the build, and will inspect the electrics eventually, however BCO doesnt seem able/competent to advise.
The layout is that the incoming supply and consumer unit is at the front of the house, shed is at the back of the back garden, and the best route for the cable is through the house (while it is under construction). Earthing is TN-C-S and load at shed was based on 6kW (although this is deliberately oversized to allow for future expansion). I'm proposing this solution:
Meter
-to-Incoming Isolator Switch (live), Henley Blocks for (N) and (E)
-to-Consumer Unit
-to-32A MCB on RCD protected way
-to-6mm Twin & earth,length 15m
-to-junction box at back perimeter of house (indoors)
-to-6mm 3 core SWA cable (outdoors, buried), length 15m
-to-garage consumer unit in shed
-to-MCBs for sockets & lights in shed
My questions are:
1. Should the shed consumer unit have an RCD or is such "doubling up" bad practice?
2. Would it be better to connect the shed cabling to henley blocks rather than the house Consumer unit? (I have seen this suggested elsewhere, but wonder if the cable runnning through the house would need metal conduit to satisfy 17th edition as it would not then be RCD protected.)
3. Should SWA be used for the whole run? (simpler, but this would seem to be more cost and more difficult to terminate at the (plastic) house Consumer Unit).
4. Do I need an earth rod at the shed?
5. Have i missed anything?
I`d appreciate it if any expert on here can cast their eyes over this and offer their opinion. Thanks.
I should state that it is in Scotland (i.e. no part P) and Building Control have granted warrant for the build, and will inspect the electrics eventually, however BCO doesnt seem able/competent to advise.
The layout is that the incoming supply and consumer unit is at the front of the house, shed is at the back of the back garden, and the best route for the cable is through the house (while it is under construction). Earthing is TN-C-S and load at shed was based on 6kW (although this is deliberately oversized to allow for future expansion). I'm proposing this solution:
Meter
-to-Incoming Isolator Switch (live), Henley Blocks for (N) and (E)
-to-Consumer Unit
-to-32A MCB on RCD protected way
-to-6mm Twin & earth,length 15m
-to-junction box at back perimeter of house (indoors)
-to-6mm 3 core SWA cable (outdoors, buried), length 15m
-to-garage consumer unit in shed
-to-MCBs for sockets & lights in shed
My questions are:
1. Should the shed consumer unit have an RCD or is such "doubling up" bad practice?
2. Would it be better to connect the shed cabling to henley blocks rather than the house Consumer unit? (I have seen this suggested elsewhere, but wonder if the cable runnning through the house would need metal conduit to satisfy 17th edition as it would not then be RCD protected.)
3. Should SWA be used for the whole run? (simpler, but this would seem to be more cost and more difficult to terminate at the (plastic) house Consumer Unit).
4. Do I need an earth rod at the shed?
5. Have i missed anything?
I`d appreciate it if any expert on here can cast their eyes over this and offer their opinion. Thanks.
