Hi, I'm looking to find out how to install electricity in a garden
garage. I plan to have a washing machine and a socket or 2 for Power
Tools. I also want to power some low voltage garden lights and power
a water feature.
I need to know what type of cable I should get to carry the
appropriate power. I assume I should put a consumer unit in the
garage but need to know what I'm looking for.
Also running the cable under ground may not be possible as I would
have to dig up an area of patio and concrete.
Any help is much appreciated.
Normally, you would run SWA armoured cable. Thickness required depends on
length and load. I'd install a B32A MCB in the house and run the cable from
there. It only has to switch to armoured cable as it leaves the house.
Inside you can use normal PVC T&E.
In the garage, install an insulated consumer unit and an earth block fed
from an earth rod driven into the ground. Isolate the cable earth and do not
connect it to anything. Connect up any required main equipotential bonding
to the earth block. This is required for structural metalwork or metal
services, such as water pipes.
Depending on budget and likely use, the consumer unit should consist of
either an RCD only system with a 30mA RCD and MCBs, or (better) a Type S
100mA RCD and a mixture of MCBs and RCBOs as appropriate (socket circuits
then must be off an RCBO).
If the garage is close to or attached to the house, you can skip the earth
rod and use the SWA armour. This may only be practical if there is no main
equipotential bonding to hook up, as this would then need to be wired back
to the house earth block.
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