Hello, I would like to have my shed wired up, for 2 flourescent lights and maybe 5 sockets, (2 double sockets, and maybe 3 singles.) With its own consumer unit. I have found a spare 30 amp fuse in the main consumer unit, this was used to supply a cooker, in what is now the dining room. The cable is in the roof at the moment, and is about 15mm wide, this cable is in a round junction box, and is not connected to anything. My question is can this cable be extended to to the shed outside. The distance to the shed from the cable is about 30m.  I would like the cable to come down the side of the house and underground to the shed. I now this is not a DIY job, part p etc  etc.

Thanks

You might save some money and make the job more attractive by offering to dig the trench.

PS: In case it's not obvious Lectrician means 6mm². This is the cross sectional area of each copper core in the cable. It should be written on the cable jacket somewhere but can be hard to see.

Well, your 6mm² over that distance can deal quite happily with 32amps, or around 7000watts.

(32amps x 230volts)

Been sitting in the shed, wondering where to put all my new double sockets (3 of them) and overhead lighting, what is the best RCD consumer unit to use? I don't want to be told I need something that I dont need.