As I wrote in the bits of my post that Simon quoted, that is clearly the case, since the 'interconnect wire' in neither AC nor LV (and not really part of a 'power' circuit'. As such it would seem that BS7671 allows it to be 'identified' with Brown, Black, Red, Orange, Yellow, Violet, Grey, White, Pink or Turquoise - i.e. virtually all of the common colours (plus some others) with the one exception (for whatever reason!) of blue
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