surface mounted luminaries

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wireday

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Master electrician
luminaries containing a ballast, transformer, LED driver or power supply is installed on combustible low-density cellulose fiberboard, the luminaries shall be marked for this purpose or it shall be spaced not less than 11/2 inches (38 mm) from the surface of the fiberboard.

Is a ceiling tile a low density fiberboard? Ive always use those T bar clips. I have seen strip lights with spacer brackets that hang lower than the ceiling.
 
Anyone know if ceiling tiles are what this ids referirng to ? or maybe its older ceiling products no longer in production.
 
Not sure if this is correct but if it is then it would apply to these old ceiling tiles that were popular a few decades ago.

306ecm15pic1.jpg


https://www.ecmweb.com/whats-wrong-here/whats-wrong-here-7
 
Thank you Infinity, article 410 is about this subject. I was going to hang strip lights onto the T bar. I don't know if the tiles are combustible low-density cellulose fiberboard or not. I have seen in our super market strip lights with a bracket at each end that drops the light a few inches. Maybe I can try to source that fixture.
 
Any drop-in ceiling tile manufactured within at least the last 40 years is fire resistant and some are actually fire rated. They are mineral fiber.

Low density fiberboard tile is that junk like in the picture made from sawdust and/or old newspapers. Most were 12x12 and either glued with mastic to the old ceiling or stapled to 1x runners.

If you know what to look for take a piece and break it to see what it's made of. But if this is a dropped T bar ceiling I don't think you need to worry unless this is a very old building.

-Hal
 
hbiss said:
Any drop-in ceiling tile manufactured within at least the last 40 years is fire resistant and some are actually fire rated. They are mineral fiber.

Low density fiberboard tile is that junk like in the picture made from sawdust and/or old newspapers. Most were 12x12 and either glued with mastic to the old ceiling or stapled to 1x runners.

If you know what to look for take a piece and break it to see what it's made of. But if this is a dropped T bar ceiling I don't think you need to worry unless this is a very old building.

-Hal
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If they are 2x4 tiles and low density fiberboard - probably would have a horrible amount of sag in them in short time.
 
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