Well I suppose the SWA to the garage should not really be left sitting on the soil by the fence - common sense says it should be constrained in some way. So, clipped to fence, or buried.
If buried, I would think at least a space depth, and marker tape on top. Of course some extra protection on top of the cable would always be welcome, e.g. some old pieces of timber (without nails sticking out etc.).
Any more rules for burying it ?
18" / 500 mm trench, sand at the bottom, lay SWA and cover in sand. Old
bricks or tiles carefully laid on top, a few inches of selected fill, then
marker tape, then rest of the fill.
(Or do what I've done and lay 110 mm soil pipe between all buildings in 500
mm min trenches and use that )
Deep enough that it will not get disturbed... So a spade depth is ok if
its somewhere that will not be dug over, but deeper if under a flower
Blinding the trench with sand gives extra protection to the cable
jacket. Cable warning tape is good also.
In my 1976-built house, ..
The professional electricians employed by SEEboard ran the
incoming supply inside some 3/4 inch yellow plastic gas
pipe as it came up through the slab under the inside of
the front door, along the top of the slab then up the wall
into the Wylex metal box in the party wall.
The original builders put some 38mm conduit down but then
forgot to mark where it was and poured the slab over it.
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