Hi Aland, and welcome to the forum.

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Why not make all conductors black force everybody into doing some sort of testing like R1+R2 or is that to radical.
That's certainly one way of going about it, although with the mix of systems we'll soon have scattered around the country that will probably have to become the norm anyway.

Don't forget there has been a similar system used on some flexible cables already:- All black cores (except earth) with number identification: 0=neutral, 1,2,3 etc. for phases and other hot lines.

By the way, I once had to try to troubleshoot an Italian-made washing machine. The wiring loom inside was a nightmare to trace. They'd used green/yellow for grounds and blue for neutrals, but everything else was wired in black, so a typical cable bunch had one green/yellow, one blue, and a dozen blacks. Aaarrgggh! [Linked Image]