Also related to this is the reidentification of conductors when using a 3-core cable to phase colors for a single-phase live/neutral/earth feed (as is common here with SWA).
Under the old system just about everybody did it the same way: Red left as it was for live, blue sleeved black for neutral, yellow sleeved green/yellow for earth.
With the new colors it's fairly obvious that brown stays as is for live, but I've seen the black and gray used both ways round for neutral and earth. The recommended method though is for black to be sleeved green/yellow for earth and gray to be sleeved blue for neutral. The idea is to break the association of "black = neutral" which would persist if black were sleeved blue for use as a neutral.
What a mess!
