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After a little advice please guys

Hi guys just wanted a little advice please


Visited a job and client wanted power to a summer house. Only four sockets required and a small heater will be plugged in possibly dehumidifier also.


Normally we would put a new circuit in depending on set up, or a short run maybe a spur if a light load.


Getting back to the to fuseboard is not possible. The only real option is to spur off a ring main socket and then its a 45 meter run to the summer house. I could up rate cable size. Its a TNS system with rcd protection already. It would need to be in a trench or only other option is cleated to a fence (not ideal) . How does this sound guys is a spur like this acceptable? Thank you for any advice
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  • Conventioanlly it would have to be a fused spur - so as long as the customer is happy with a 13A limit for the whole summer house, I don't see an insurmountable problem. Just double check that the ring isn't heavily loaded already and keep and eye on voltage drop (including the existing circuit) - 45m is a reasonably long run, so as you say the cable might have to be a bit chunkier than usual.


    You could go 'independent' and rate the spur higher than 13A (the old regs used to mention a 16A MCB or you might think of 20A) - but you'd have to show that the loading on the original ring wasn't going to compromise anything, which might be trickier.


       - Andy.
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  • Conventioanlly it would have to be a fused spur - so as long as the customer is happy with a 13A limit for the whole summer house, I don't see an insurmountable problem. Just double check that the ring isn't heavily loaded already and keep and eye on voltage drop (including the existing circuit) - 45m is a reasonably long run, so as you say the cable might have to be a bit chunkier than usual.


    You could go 'independent' and rate the spur higher than 13A (the old regs used to mention a 16A MCB or you might think of 20A) - but you'd have to show that the loading on the original ring wasn't going to compromise anything, which might be trickier.


       - Andy.
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