BigWallop writes

"Welsh Bob" wrote in message
. com...
As an occasional student of the wiring Regs, i've been wondering this
for a while - when there is a remote CU in an installation like in the
flat in this case, why is the connection made from the main CU to the
remore one made using armoured cable if its internal to the property.
Could the link be made with some hefty T&E?

It could be made with T+E but the armour gives a more secure earth bonding
because there is more of it and not just a thin inner core of bare copper.
Also, SWA Cable can be made more secure in any switch gear that is used to
isolate the remote mains supply. It is also more protected against damage.

And, if the wind is in the right direction, SWA is cheaper - esp in the
larger sizes.
4-core SWA, 2 cores used for N and 2 for L, used to be about as cheap as
you could get for a long tough run.
--
roger