Is there a code reference that prohibits dropping 1 leg of a 480 circuit to control HID lighting? I notice 410.141(B) only applies to fixtures exceeding 1000V.

Wewire2:

Care to explain the above with a little more clarity please.

Sure, thanks John.
3 phase 480, 3 wire is pulled to a light pole with 4
fixtures on the pole. The site engineer wants to drop legs to control the lights separately. I don't like the design but can't seem to find anything that prohibits it as long as the required disconnecting means is in place. What do you think?

Look at 410.104(B). I don't know if it applies but it could. Not sure what the Design Professional has in mind but this might help.

George, I think that's what I'm looking for. The "auxiliary
equipment" terminology threw me off and I skimmed right past it. It appears that the term auxiliary equipment refers to ballast. Thank you sir!

410.104(B)Where supplied by ungrounded conductors of a circuit, the switching device of auxiliary equipment shall simultaneously disconnect all conductors.