Paul,
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Am I missing something elsewhere in AS3000, or is this the only place where any colors are specified?
Not sure if I quite get what you mean?.

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Is certainly looks as though the days of yellow phase B are numbered in New Zealand.
Yes, Paul, as far as the PoCo that I work for goes, Yellow is non-existant now with new stuff.
All new mains, feeders and the like, all have the White B Phase.
Cable manufacturers here started using white as soon as they found out that a change was in the wind, in fact even before the amendment to the Regs came out.
Just as a small note too, I have seen over the years here, with older Underground cables, Orange was also popular as the colour for the B Phase too, before yellow, so I am told by older folk at the PoCo. [Linked Image]