Adding a socket to garage consumer unit

[rubberduck]

Assume this should be straight forward after watching a few YouTube videos etc. I want to add a socket in my garage and have 3 unused MCBs in the consumer unit. Just need to get some armoured 3 core cable and connect the earth and neutral to the plates and the the live to a free MCB right?

 

[SPG]

Is the garage attached to the house, if so then you can just run some 2.8 Twin and earth on a 32amp breaker from the MCB (depend on what you are planning to run really) I just use a 16amp as nothing major is being used in the garage really.

If its not and you need to route the cable in the ground then armoured cable as you say, but then i think you need to fit a smaller MCB for the garage, using a 40amp breaker from the house MCB and a 6amp for lights with a 16 or 32 amp for the socket.

(by no means am i a sparky)

 

[Mercenary Keyboard Warrior]

I have done similar to my log cabin

My works sparkie advised on the following :

Run armoured to the cabin (it goes via an intermediate socket I already had outside), when at the cabin, run the 13Amp socket, and then step down via a 5amp fuse for the lighting.
It all runs off one spur and is fine. we just have to be concious of the total loading, but its well under realistically.

he also said to use metal boxes so they could all be earthed. So everything in effect is double earthed.

I was going to do the mini MCB thing but he advised against it.

 

[Pocah]

In short yes. You just need to use an mcb that is rated appropriately. That would be 15A or 16A. You then run a 2.4mm2 cable from the fuse box to the junction box that then connects to the armoured cable. The other end of the armored cable, in the garage or whatever, goes right to your socket. A 2.5mm2 lead from that socket goes to a fused switch, with a 3~6A fuse, which then uses 1.5mm2 cable to connect to your light(s). It's pretty common to use 20mm conduit to cover the lead that goes from the socket to the fused light switch and they are usually placed close so not much conduit is involved.
All of this is fine as long as the lengths are not ridiculous, in which case you need to take in to account voltage drops and so on, so, you know, keep the cable runs within reason.