On Thu, 28 May 2009 06:28:30 -0700 (PDT) someone who may be Andy
Dingley wrote this:-

The whole problem stems from the problematic re-use of blue & black.

Blue was only used in three phase wiring. Anyway the harmonised blue
is a light blue, not the deep blue of the L3 conductor insulation.

Black is a more difficult case. However, my recollection of the
discussion is that it is used to indicate an energised conductor in
several wiring schemes and thus it made sense to adopt it.

So we shouldn't have done this - there's hardly a shortage of other
colours.

"We" did this in the interests of standardisation. My recollection
of the discussion is that the "plenty of other colours" become fewer
when one looks into it. It is most unlikely that people would adopt
a brand new wiring colour scheme just because the IET devised it.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54