Ceiling light fixture wires - entirely in box?
There is going to be some of the wire loose above the cover to allow the fixture to be wired 410.20. I don't see a specific length listed in section 410 (luminaries, lamp holders &amp; lamps). Installing the fixture per the manufacturers instructions is the key because there are so many diferent types code doesn't always give specific requirements. An example of this would be a 4" canopie or shell may only need 6" of free wire to be able to make the connections but a 12" canopie or shell may require 8-10" to make the connections. Hope this helps.