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Garage Wiring


jeff oakley

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I am guessing we have a few sparkies on here. I have got to alter all the wiring in my garage and although confident in doing the job, working out the correct cables is causing my head to spin.

 

The garage is wired at the moment with around 6 twin plug sockets on a ring, with one spur. The wiring is twin and earth. Fuse is 20 amp.

 

There is another circuit that runs my lathe and compressor, which has a 2 hp motor runs again on a 20 amp fuse.

 

The lights are then on a separate circuit, 10 amp fuse.

 

This is all fed from the house via and RCD and the fuse is 30amp .

 

Ideally I want to use separate wires down plastic conduits, probably 10 twin plugs for that circuit so what would be the best size wire for that?

 

Then the same again for the compressor circuit.

 

Then the lights

 

A new consumer unit will also go in at the same time. Nothing has ever tripped with what is in there and it is just with a lot of alterations in the garage that I need to do this so might as well do it right.

 

I know I will have to get it signed off but that is no problem. Any advice welcomed.

 

Jeff

 

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Hi Jeff,

If you wire the sockets in a ring, 2.5mm will be fine, i assume you need 10No sockets for location and not that you will be using them all at the same time.

The 20 amp compressor i would run a 4.0mm cable as a radial circuit.

And the lighting in 1.5mm.

If the lighting and the compressor supply are contained in surface conduit i would put them on a mcb.

The socket circuit needs to be on a rcbo. I would still use a 20 amp rcbo to avoid any discrimination issues as the feed to the garage is a 32 amp.

If you need a drawing doing pm me, happy to help.

Cheers

Greggs..

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You will be fine running a ring in 2.5mm for your ring main and a 32amp MCB and your 2hp compressor will pull around 12amps so you could use 2.5 on a 15amp MCB but I would run in a 4mm cable and a 20amp MCB just in case you ever want to but in a bigger compressor and for your lighting 1.5mm on a 6 amp MCB

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