Hugh wrote:
Just to point out that in your diagram you say that the light fitting
doesn't need earthing.
It does if you can reach for example a shower cubicle while touching the
fitting.

Has a circuit-protective-conductor not to be run in parallel with all
cables and to all accessory positions, regardless of whether its'
"required" or not?

471-08-08

In every installation which provides for protection against indirect
contact by automatic disconnection of supply, a circuit protective
conductor shall be run to and terminated at each point in wiring and at
each accessory except a lampholder having no exposed-conductive-parts
and suspended from such a point. {i.e. the cpc must be taken to a
ceiling rose, but need not be continued to a pendant}

and note also

471-09-02

Where a circuit supplies items of Class II equipment, a cpc shall be run
to and terminated at each point in wiring and at each accessory [...
exception as above, or where 471-09-03 applies]

Owain