External garage electrical question.

[voicepro]

Hi team... please help with this...
my mate has just built a large garage in his garden, it requires 8 sockets dotted about and general strip lighting...
from a power point of view will the following cover what he's doing...
Install 5 way CU in the garage...
15m max 2core 6mm SWA from house to garage
new RCD next to the existing house CU and run tails to this.
term the SWA onto the new mini CU (house) and terminate the sheathing onto it
terminate the SWA in the garage CU not terminateing the sheathing...
New earth spike for the garage and terminate onto the SU...

Q.will a RCD 30a be sufficent in the new mini CU house
Q.is the eathing arrangment ok
Q.is the power rating ok for the 6mm cable..

Any advice will be gratiously accepted...
many thanks

Daz

 

[photon]

You cannot just use an RCD to supply this as there is no overcurrent protection to the SWA cable other than the service fuse.
Make the RCD an RCBO and you will provide both overcurrent and leakage protection.
Generally a switchfuse to an RCD CU in the garage is a better method.

 

[ban-all-sheds]

Hi team... please help with this...
my mate has just built a large garage in his garden, it requires 8 sockets dotted about and general strip lighting...
from a power point of view will the following cover what he's doing...
Install 5 way CU in the garage...

Why a 5-way?

15m max 2core 6mm SWA from house to garage

Use 3-core.

terminate the SWA in the garage CU not terminateing the sheathing...
New earth spike for the garage and terminate onto the SU...

Why are you not taking the main supply earth to the garage?

Q.is the power rating ok for the 6mm cable..

Yes, but you might as well put in 10mm²