Even #8 and #6 are often used for branch circuits for lighting especially in large multi-story buildings. I often have to use #6 conductors for standby lighting loads when they originate in a E-panel two floors below and the run length is over 400' in total.
Normally in small buildings I admit that this is not an issue, but in large multi-story buildings, schools, etc...etc...?
I have added standby lighting/emergency power via automatic transfer switch and a generator to many schools in alaska. In every case the lighting circuit conductors were spec'd as #8 or more often #6 conductors.
Again should I color code the conductors black,red,blue,white/brown,orange,yellow,gray or just pull six or eight black conductors?
I have never had any problem with this particular requirement because it is one that makes my job easier when it comes to troubleshooting and remodel work.
