point taken slips, i may have been a little hasty,
but in all honesty if anyone remotely calling themselves a spark was using conduit etc as a cpc then yes I would agree to using a flylead to earth the accessory,
the bias being on earthing the accessory, not the back box.
my point was in being that if the accessory is earthed (via T&E for example) then there is absolutley no viable reason to earth the back box, after all its buried in a wall that should already be at earth potential.
metal clad surface mount is slightly different as you must ensure all accessible metallic parts are earthed.
as for laughing off the regs, that is most cetainly not the case, but i follow them as was IMHO intended, not to the letter.
if I followed them as they are written then i dont think i would ever find a job with no faults whatsoever.
how many people actually go around labelling every switch with the fuse number, or tagging every cable with the circuit number at every termination?
yes that is what the regs say, all conductors properly identified!!
when was the last time you opened a CU and the neutrals were numbered on the actual cable, not the terminals.