garden office connection

Separate 16 A circuit, based upon a 2 kW load and 30 meters you’d only need to wire it in 2.5mm. Don’t understand why 6.0mm was advised... Anyway, get yourself an electrician to attend, advise and install. Not much can be done from here. Good Luck, Carl.

If its a garden office you'll more than likely have a heater, possibly 2kw, running IT equipment, lighting. What other things might you run from the garden office in the future?.... Garden lighting? Hot tub? If you spur from a socket in the house and want more than 1 double socket you have to fuse it down by installing a FCU at the beginning of the run limiting all sockets in the spur to 13amps. Personally and what I do do is run a new circuit in 4 or 6mm SWA to future proof any further requirements, to a small Consumer Unit and run a socket and lighting circuit from that. There's arguments to have the garden building on its own earthing system (earth rod (TT)). A new circuit IS notifiable to your LABC so will need to be carried out by a qualified electrician /installer.

You can have a circuit spurred from a socket. However, it would need to be limited to 13A (3kW). This could be sufficient for your needs. If the circuit is 30mA RCD protected then all you need to do is install a 20mm galvanized metal end box on the outside wall behind the socket you wish to use. Then terminate a 2.5mm2 3-core SWA to that and bury it all the way to the shed then terminate it on to a metal clad 13A unswitched fused spur inside the shed. You can install lights and sockets off this fused spur. If the circuit you spur from is not RCD protected then make the spur in the shed a metal clad 30mA RCD one. My calculations show that volt drop for 13A over this distance is less than 3% which is maximum allowed for lighting. A 13A circuit would be ample for the loads you intend to use. Keep your heater down to 1 or 1.5kW and you will be fine. If you do think you need more than 13A I'm afraid you would have to consider the alternative and use a 20A or 32A supply from the consumer unit. And this would necessitate a larger cable, possibly a 4mm2 or 6mm2, because volt drop is the overriding factor in this case.

You will need a new circuit. You can run a pvc cable internally and then connect the SWA to that at the back of the house. Dont get a shed builder to do electrics. Get an electrician in separately. ——— Dont use 2.5mm if it’s buried, there are minimums...... ——— Part p doesn’t really change the work, it just adds requirements for paper work. The wiring regs are what dictate how you should be doing things.

No has to come from the main consumer unit

Hi This should be a separate circuit from your consumer unit to a mini board in the new building and probably run in 6mm to cover current and potential needs. Circuit should be on a separate rcd to avoid nuisance tripping as well

There's a number of questions that need to be answered before an electrician could give an answer. What type of earthing system does you house have? Is it TT or TNC-S. What type of circuit has is the socket you want to use? Ring or Radial Does the exisiting circuit test OK and has it got RCD protection? My preference would be to run a circuit from the board, as in most cases future demands will overload the circuit suplied from a socket. It may be possible to hide cable in loft or soffit. Best to get a regestered electrician to advise, as it souds like the office garden builder does not fully understand what is required. Local electrician will be able to advise if this work is notifyable to your local authority building control.

The electricial loaf you require is small however the cable run is long and many other factors to take into consideration when design for a cable run can be made. You could run cable into roof space and exit from there and in case cable in 50 mm x 50 mm metal trunkin and paint to suit later. I’d recommend you bring in a JIB electrician and have the job done right where you have peace of mind. Definitely would not recommend take the supply from house skt circuit.