314.23(F)
(F) Raceway Supported Enclosures, with Devices, Luminaires (Fixtures), or Lampholders. An enclosure that contains a device(s) or supports a luminaire(s) [fixture(s)], lampholder, or other equipment and is supported by entering raceways shall not exceed 1650 cm3 (100 in.3) in size. It shall have threaded entries or have hubs identified for the purpose. It shall be supported by two or more conduits threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured within 450 mm (18 in.) of the enclosure.
[This message has been edited by Ryan_J (edited 04-16-2004).]
Nevermind, probably doesn't apply, other than during the process of re-lamping.
[This message has been edited by Ryan_J (edited 04-16-2004).]