so does the grey become the cpc conductor with green/yellow pvc tape indication, black become neutral with blue pvc tape indication and brown phase conductor..??
the niceic reccomend brown-live black-earth grey-neutral (with appropriate sleeving)
while this makes sense from a cable jointing point of view where both single and 3 phase are present (as it gives the same mapping from old-new as when using the colors for 3 phase) it is also very unintuitive and likely to confuse diyers the combination you suggest being the one likely to be obvious to them
You'd think, wouldn't you, that Europe-wide there'd be a large enough market for single-phase 2- and 3-core SWA for it to be made with the same harmonised colours as T/E and flex - Brown/Blue and Brown/Blue/G-Y.
while im not sure if there are any regs explicity prohibiting it, it is definately very bad practice to use a green&yellow core for anything other than earth even if you do sleeve it at the ends
given that wholesalers (and indeed the sparkys themselves) only want to stock one code of 3 core swa it therefore obviously makes more sense to stock the brown/black/grey variety than the brown/blue/green&yellow
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