I've got some new three-core flex. 2.5mm squared.
It's the sort of thing you would use for an extension lead except I've not
seen any that thick before (cable is about the same diameter as my little
I can't see any reason why it shouldn't be used to extend my ring main but
not seen it used for that purpose (possibly because it would be much more
expensive than twin core and earth).
Does anyone know of a reason why I shouldn't use it please?
Thanks very much,
It's much less easy to make a good job of connections in the back of
sockets etc. because of the thin strands in the flex. The screw
terminals of sockets (and other wiring accessories) are not designed
to hold flex properly. Stray strands are always a risk.
It's also less 'self supporting' so in some places may need a lot more
support than T&E.
So in principle it's OK but given the 'good workmanship' requirement
of the wiring regulations you might find it difficult to get it past
Proper T&E is very cheap.
Flexible cable is allowed for fixed wiring to the regulations; provide all
the other requirements are met to BS7671.
I wouldn't recommend using it however, rather use 2.5mm² PVCI cable, TW & E.
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