Sometimes it’s better to struggle through something on your own
Yes, thank you, that strategy finally, after three decades of struggling earned me a short emergency stay at a psychiatric clinic about six years back due to being acutely suicidal and some much needed therapy for three years afterwards. It's right up there with "just going out and and walking for a bit" and "enjoying the sun". I'm completely fed up with people telling me to suck it up and I'm not doing that anymore. Nobody in their right mind would suggest not splinting a broken leg because the material used to do so sheds microplastic or something.
I have ADHD and humans are not always available to help me separate tasks into small packages and report results back to or sort a huge, insurmountable task.
So only defined isolation distances between phase and ground exist which would not be the case when an unisolated ground wire could just slip into phase distribution rail or into a phase connection.
EDIT: Also, the distribution panel even with the front off is defined as touch safe for something the diameter of a finger. An uninsulated ground wire that suffers an error would break that definition.
Yep, neutral is blue, ground is green/yellow striped. The latter everywhere, e.g. in a server cabinet you'll mostly find the strap between body and door in yellow/green.
Phases, L1 to 3 are brown, black, grey. Or you may use numbered cables for rail interconnects if necessary. You can see me getting a bit sloppy with all brown 16mm² for L1 to 3 leaving the meter slots, but they are numbered then.
Every outlet gets ground, neutral and one phase, so usually I'd enter a room with 5x1.5 NYM and then connect the phases alternatingly to the outlets while forming a chain throughout the room, so phases get loaded equally in daily use.
Whenever I look at US domestic electric installations, it all looks so... temporary. Seems like there are no standards regarding cable colors, cable configuration, central distribution of N and PE, segregation of the panels contens, suddenly there's a length of uninsulated copper in the middle of it all and a yellow isolation - I mean, you guys don't die more often than we do, so I guess it works all out and is probably a lot cheaper.
I have no good counterexamples, but I snapped a few pictures when I redid the main distribution in the basement
...and that's what the sub-panels per floor look like:
You shall have one anyway: https://youtube.com/watch?v=pJ-51pQXERA