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Discuss Installing a secondary consumer unit in the garage?? in the Electrical Work - Electricians Jobs area at ElectriciansForums.net

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Dont forget if you are running 16mm T and E the earth will be too small. 10mm earth required.
That's only if there's a requirement to bond services back to the MET, if there's no bonding requirement then the earth is sized accordingly depending upon the result of the adiabatic equation.
 
HI
I am aiming to install a garage CU that extends a circuit between the main CU to a new garage CU. The new garage CU will be used on three circuits
a) I have run 50m of 6mm 3 core SWA between the garage and shed A. This is to feed a couple of sheds that will both have lights and sockets. I am to install a garage CU with 30mA RCD in each shed to run the light cicrcuit and sockets. Shed A will also serve a 32a circuit for shed B
b) seperate 2.5mm SWA on 6a circuit to run 6/7 LED lights in the garden. Will run off the new garage CU
c) seperate 2.5mm SWA on 20a circuit to run a water feathure in the garden

Now my question is it ok to have
Main CU connected to garage CU with 6mm SWA cable (this Tenby unit has dual RCD and non RCD). The new garage CU will have RCD protection
a new garage CU is installed in shed A and also has RCD protection
finally another garage CU Is installed in shed B that also has RCD protection

All because I cannot find an adequate garage CU that does not have RCD protection
In bold, depending upon your intended load for the garage and sheds 6mm SWA on a 50m run is not suitable for voltage drop requirements. Depending upon the loads and distances for the next two sheds you'd be looking at either 10 or 16mm to supply the garage.

Also depending upon load and distance you could possibly use 1.5mm SWA for the lights and water feature.

All of the above is also reliant upon installation method, i.e. buried/clipped to a wall etc.

I would urge you to consult a local electrician to have this designed correctly and depending upon your location there's also Part P notification to be considered.
 

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