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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Wiring the garden shed
During renovations I have access to run new cables from the CU to the
back of the house. This access will soon be blocked. So, it's now or never for power in the wooden shed which is 10m from the house. I'd like something real basic, perhaps a single socket outside and a light inside the shed. I plan on using this for hand power tools outside the shed. Note I dont mind if the shed light goes off on an RCD trip (it's a small shed so I wont be doing much inside). I was thinking of running 2.5mm T&E from the CU to the rear of the house and get it wired up later. I imagine completion would be something like: In the CU, connect the 2.5mm to a new 20A MCB on the RCD side (30ma). At back of house (inside) connect 2.5mm supply cable to a switch which feeds the SWA (underground) to the shed, connecting to the socket outside the shed which then feeds the light. Would such a design comply with the regs or would I need a more complicated setup involving another CU and RCD ? Most importantly since I am happy to limit to 20A would 2.5mm T&E be suitable to run from the main CU to the back of the house ? Would an earth from the main CU to the shed with RCD protection on the CU be ok ? |
#2
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Wiring the garden shed
Declan wrote:
I'd like something real basic, perhaps a single socket outside and a light inside the shed. I plan on using this for hand power tools outside the shed. Note I dont mind if the shed light goes off on an RCD trip (it's a small shed so I wont be doing much inside). I was thinking of running 2.5mm T&E from the CU to the rear of the house and get it wired up later. Fairy snuff... then again if running a cable is going to be a major PITA later it might be worth using a bigger cable now. If you don't use the capacity then you have only wasted a little money on the difference in cable cost. If you do however find you needs expand then you save major hassle later. IIWM, I would go with a 6mm^2 cable through the house now. In the CU, connect the 2.5mm to a new 20A MCB on the RCD side (30ma). At back of house (inside) connect 2.5mm supply cable to a switch which feeds the SWA (underground) to the shed, connecting to the socket outside the shed which then feeds the light. I would tend to terminate it inside the shed first and then connect to your sockets. Remember you will need a fused connection to the lights. However before you get too far into this there are some details you need to investigate and think through first. In particular you need to look at the type of earthing that your house has as this will influence how you do things at the shed end. Have a look at: http://www.iee.org/publish/wireregs/...s_outdoors.pdf or http://tinyurl.com/dbmx5 Would such a design comply with the regs or would I need a more complicated setup involving another CU and RCD ? Depends a bit on circumstances. I know you said you are not worried about losing shed lights on a RCD trip, but are you happy losing all the other circuits in the house that are protected by the same RCD? Or for that matter trekking into the house to reset it each time (when going to the shed might be simpler)? Also outside circuits are more prone to causing spurious trip problems anyway (more likelyhood of damp getting into unwanted places), again if this should happen do you want be experiancing these on the house RCD? Most importantly since I am happy to limit to 20A would 2.5mm T&E be suitable to run from the main CU to the back of the house ? If you really only ever anticipate a small load being used at the shed, you could do an even simpler install by taking a spur from a fused (and switched if you want) connection point from a suitable point on an existing ring final circuit in the house, and feeding the shed from that. All you would need in the shed would be an incoming double pole switch, connections to your socket(s) and a FCU to feed your light. Would an earth from the main CU to the shed with RCD protection on the CU be ok ? See my comments above... -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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