How deep should I go, I heard 2m but that seems a lot for 2 or 3 double
sockets and 1 or 2 lights.

Also what, in your opinion, supply cable mm2 size should I use 4 or 6mm2?
Should a 4mm2 use 30/32A and 6mm2 use 40A. Plus what earth cable to rod
should i use?

Many thnx


The cable you use as the supply should be connected at both ends
regardless.
The only thing you need then is to connect the earth bar in the consumer
unit to an earth rod in the ground local to the shed. The requirement is
not to rely on the length of cable your using as the supply as the main
earthing point of the shed, because if this breaks down in any way it is
not
supplying a proper earth point to the shed.



Always make the system separately earthed from the house circuits, but
this
doesn't mean separating the bonding on the SWA cable between the two
points.
Use the house earth to protect the outer skin of the cable between the
two
consumer units, but have a separate earthing rod into the ground
locally
to
the shed and connected directly to the earthing bar in the shed
consumer
unit. It doesn't interfere with any of the systems proper working
profiles
and just gives the added local protection needed for this type of
installation. Make sure that the impedance between the rod and the
ground
is as low as humanly possible, so this night mean you have to bang in
a
two
metre length of 15mm copper pipe to have a proper protective local
earth.

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