In article ,
Chris Green wrote:
Tim+ wrote:

The only thing I‘m pretty sure about is that you don‘t use solid cored
cable for mains. It all has to be multi-stranded.

Not for mains 'permanent' wiring. Everything up to 20 amps (including
ring circuits) is single solid core twin and earth nowadays.

not if it's in conduit.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle