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Think 0 is in an actual wet zone, inside of shower, or within x Cm of a basin etc. Zone 1 is adjacent and then Zone 2 is just rest of the bathroom, unless the whole floor is a wet room zone in which case I think you have to treat the entire room as a zone 0.
Earth all the things.
Mate bought a new house in 2018/19 and had to get some wiring seen to, used his own contractor and charged back to the house builder (because reasons, if they couldn't build it right in the first place, or deal with it in the numerous revisits then they weren't up to the task). Electrician found that basically none of the earths were continuous anywhere, lots of issues in the ring mains, shower cable 1 size undersized throughout its length, all the downstairs lighting was metal and not earthed at all, just wired as a regular light and big hole behind the consumer unit that went into the cavity wall without barrier, so a bit breezy inside their hallway!
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BrickMan
Airhead
Do you mean specifically integrated? or all zone 0/1 lighting. I've been caught out not being up to date on the now not so special locations before.
Also I guess this is a consideration because you are anticipating there being no earth available? I forgot about that as most of the lighting loops I come across have an earth.
Just had another look at the chart. Zone 0 is in the bath/shower tray so earthing makes sense. Zone 1 inside the shower compartment or right above the bath/sink, again sensible for that to be earthed especially if metal.