Cable size to shed

Question

I’m putting a small three gang fuse board in a shed witch is about 6 metres from the main CU. 
The fuse board in the shed has a 63amp main switch. What size SWA cable would be best to use?

Paul · Accepted Answer

This is not a job for DIY, get an electrician. Outside comes under special locations and is regulated by part P of the building regulations.

Steven · Answer

It all depends on what power you're using it for in your shed. I.e if it's just for some sockets and lights then 4mm will be fine but if you're putting in a hot tub then you will need up to 10mm.

Adrian · Answer

These jobs are for part "p" electricians and not homeowners.

Prel · Answer

16mm armoured cable you need, this is  perfect  for your job.

Paul · Answer

It depends on what circuit breaker or fuse the wire is connected to at the main consumer unit in your house, it also depends on how the cable is laid.  If it’s a 16A breaker or 15A fuse use 2.5mm2 three core.  If it’s a 32A breaker or 30A fuse then use a 4mm2 three core.  Personally, I wouldn’t recommend that you do this kind of work because you need to notify building control.  If you do it wrong and someone gets hurt you could find yourself in a lot of trouble.  Regards Paul.

Sokol · Answer

To be sure put 16mm swa but 10mm should be more than enough

Steve · Answer

It all depends on what size breaker you were intending to put it on in the main fuse board. Usually, a shed will be fine on a 4/6mm on a 32amp at the main CU however it depends on what you're aiming to put in your shed. Either way, I would advise using an electrician.

Stanley · Answer

6mm swa is fine but it all depends on  what you are using power wisely in the shed

Marek · Answer

First of all. Fuse is sized to cable, as the fuse main function is to protect the cable. You don't size cable to fuse. You size cable only to your expected load. Regardless you have to use a competent electrician, as this specific job requires to be notified to building control. You can do it yourself if you would notify the job to build control before you start and they would approve. If you have a 63A main fuse, then we are talking about at least 10mm, as 6mm is just a bit too thin.

Kestutis · Answer

Hello, 
I would recommend to install 10mm2 cable. 
Thanks

Cable size to shed

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