John Rumm wrote:
MisterP wrote:

c) The recessed steel boxes do not have an earth connection. Can one
be fitted or is it better to replace each box?

As long as they don't have two moveable screw holes then you can rely on
the screwed connection from the accessory to earth the box.

Really? But modern backboxes typically don't have two moveable screw
holes, just one; and surely a modern box must always be earthed
separately?

David