Is there an "easy" way of adding an earth/cpc terminal to a metal back box that is already in position on a wall?
I have a situation where there is a single old, metal, back box with four fixed lugs.
The space inside the back box is used to house connector blocks that join two lengths of 2.5mm T&E. All this is covered with a blanking plate secured with two metal screws.
The old metal back box has no cpc connection terminal. It is secured to the wall with large nails where you would hope for screws (making replacing it an unenviable job), but the metal is in good condition.