Twin & earth routing though a wall.

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As the OP has implied, if the angle is less than 45° (indeed, even if it is 45°), there is a problem IF one wants to comply with the recommended minimum bending radius for SWA - and, as the OP's maths has correctly concluded, a 45° hole through a 300mm wall would be about 420 mm long. I know what I would probably do, but I'm not going to 'recommend or advise' it :)
An excellent idea but, other than for people a lot more clever/skilful than me (and particularly when one is not drilling exactly horizontally), that presents a next-to-impossible 'aiming problem' :)

Kind Regards, John

I doubt whether its 45 or 30 degrees the swa will be meet its bending radius requirements without carving a channel out.
 
I doubt whether its 45 or 30 degrees the swa will be meet its bending radius requirements without carving a channel out.
Agreed, but the extent of the required channel reduces as the angle increases. However, as I've said, 'I know what I would probably do'!

Kind Regards, John
 

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