t-bar ceiling

[ICE]

This fixture is supported by the t-bar. It is Listed and Labeled. The installation instructions show it as you see it. My question is: Should there be another wire from the rafter to the fixture to keep it from falling with the ceiling in the event of an earthquake.

 

[Phil]

Yes. The requirement is in ASTM E580. Quote from 09 version below. If there is more recent version it has the same/similar

For Seismic Design Category C: "4.4.3 Lighting fixtures weighing less than 10 lb [5 kg] shall have one, No. 12-gauge [2.70 mm] safety wire connected from the fixture housing (not the detachable end plates) to the structure above. It is not necessary for these safety wires to be taut . . ."

For Sesimic Design Category D, E and F: "5.3.4 Lighting fixtures weighing less than 10 lb [5 kg] shall have one, No. 12 gauge [2.70 mm] safety wire connected from the fixture housing to the structure above. It is not necessary for these safety wires to be taut."

 

[ICE]

Thanks Phil