As for the use of BX in pendant and chain hung applications?? ... Unless there is intentional movement between the building and the fixture I doubt we will ever reject an installation where the fixtures only move as a result of accidental contact or seismic event.
The wording of 30-406 is "chain type". I'm not sure a fluorescent on chains is a "chain type" fixture. If you were to allow that a two-chain fixture is a pendant, BX would be acceptable, as would conduit and solid wire. Then, enforcement would be consistent with the rules and with trade practice. The application of the code would also be consistent with the CSA approval of fixtures sold with a flexible cord attached.
What gauge of tie-wire are you guys using? I prefer #14 T90, white, for a clean, professional look.
