Feeding Detached Garage

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It is ok to feed a garage from 2.5mm T&E on 20A MCB which is run in conduit to detached garage 4M away with conduit along fence. Then terminate into old type fuseboard with 5A & 15A circuits for sockets and light? Does it need seperate earth? Or is earth on T&E ok?
 
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The fixing to the fence will be an issue as it is not considered a secure permanent structure to fix to.
If it was a wall.........
You will need approval by building controls prior to starting work.
Is there any RCD protection on the circuit?
 
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DIY'er rather than pro ?

Will the 20a main board fuse run off an rcd rail?

Ideally there should be an rcbo / rcd circuit control for the added safety reasoning and to at least TRY to comply with 17th ed.

Why not run the 2.5mm to a fused spur rcd unit rated at 13a and then daisy chain on to a 2nd fused spur rcd unit rated at 7a. You then get some safety, and isolation of the sub circuits (light and sockets) in the garage.

The pro method would be a feed direct from the main intake via a henley block and then provision of a sub board (builders CU) in the garage with rcd + breaks or a couple of rcbos. However, if you don't have any intention to test or can't get access to a mftu doing it the correct way and not testing is worse than using the fused spur rcd units I've suggested.

Flame suit is on, awaiting i/c BAS missiles.

I'd also add that such external works shouldn't be done DIY since Part P says so !

Finally conduit along a fence is iffy since you will have problems securing the saddles, the plastic is on the edge of being acceptable and a fence isn't considered a permanent structure- as in the posts rot, and or wind could pull the whole lot down.
 
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These questions:
It is ok to feed a garage from 2.5mm T&E on 20A MCB which is run in conduit to detached garage 4M away with conduit along fence. Then terminate into old type fuseboard with 5A & 15A circuits for sockets and light? Does it need seperate earth? Or is earth on T&E ok?

Seem very much at odds with this claim:
I'm a Domestic Spark
 

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