If this is confirmed by our UK freinds but one other website one person did informed me about the switching colour:

Local Switching
Black - common
Gray - switching live
Brown - Live


please note this the black i will double check it and if the info is corret i will leave it as is.
otherwise will make a note of change.

PaulUK please check this info as well too

Merci, Marc

P.S. this colour code item will change as the info is verifed

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)