Have you ever done it like this?

Not at all. That's a 70's thing. You dont show the metal switch. And the cpc will probably be bent over en route to the switch plate.

Now days its straight to the metal switch plate so long as the metal back box has a fixed lug.

BTW the modern approach is 35 mm metal back box. I've not fitted a 16mm in my career.

No, because:

(1) Green sheathing was before my time.

(2) I'd put the cpcs under the stem of the screw where they should be rather than under the head.

Interesting idea though. If the cpcs are held firmly, I cannot see a problem.

if that is two lengths of red and black to an all plastic light switch with no CPC terminal on the switch, then yes I have. I may then put both CPCs into one sleeve so that loop is continuous even if the screw rots off, as it seems to be doing here.  Do not try toi use it like square choc block without a lot of doubling over, the 1mm2 tends to fall out the sides.

Going back a few years now, I have also been known to create  a terminal for a CPC to anchor down, in an older back box without one, by use of a self tapping screw and a screw cup washer

Mike

Nope, I always thought the wires were meant to go into the "cage" below the screw point, not directly under the head.

I never did like the idea of copper-zinc/steel corrosion though and much prefered the type with solid brass terminals rivited to the box.

   - Andy.

Nope, Green/yellow nowadays not Green (but I have done quite a few Greens in the past). My sleeving is pushed down the throat of the T & E so you can not see the bare earthwire, lighting cpcs I do tend to twist them and maybe double them as well dep[ending upon the earth terminal type and size in order to get a good mechanical grip. If it`s a metal faceplate I would terminate in that then a tail to the box, if not then directly to the box. I do not like that kind of box terminal it`s the two flat plate syndrome all over again, a box with a proper tunnel terminal is when I pick the box but if already fitted well I`d use it.

The cables are one twin and earth plus one single with insulated green earth. The loft is full of assorted junction boxes under thick loft insulation. Such fun.

Z.

Another view of it.

ooh!

Yes, late 60's / 70's, many times... where else are you going to fix the earth? 

Problem with these is that they squash down and not so good.