![]() ![]() A box, with or without a bracket or bar hanger, intended for support of a fixture weighing more than 50 lbs is marked with the weight of the fixture to be supported. It just seems that there should be some entry that directly addresses this to prevent any possible misinterpretation of the matter.Ī box, with or without a bracket or bar hanger, intended for support of a fixture weighing 50 lbs or less is marked "FOR FIXTURE SUPPORT" on the carton to indicate that the box is intended for fixture support. I suppose it could be argued that since The UL White Book only references device boxes and device plaster rings, not ceiling boxes and round plaster rings, then by default they are allowed to be used in ceiling applications for fixture support. I have searched the 2008 UL White Book up and down and can only find the following statements posted below regarding this. That's what I was hoping to here, but would really like to have something in writing just in case it ever comes up as an issue on a job. The 6 pound limit you refer to is for 'old work' boxes, where the box is supported by the drywall, rather than by being attached to a framing member. The UL "White Book" does a better job.Īny securely attached metal box with a metal plaster ring - of any style - is good for supporting fixtures to 50 pounds. Of course, that's no surprise the NEC does not directly address the issue, despite there being some imcomplete references. I think that you've mixed up a few things. and UL listing.ģ14.20 passively mentions setback of plaster rings in walls and ceilings, but that is all.ģ14.27 refers back to 314.27 and the exception to 314.27 simply mentions plaster rings only on boxes used for support on Utilization Equipment under 6-pounds, which as I understand refers to things like smoke detectors, occupancy sensors, etc. The rings themselves don't have much info on them either other than Cu. ![]() The UL white book only seems to mention box extensions and device boxes with plaster rings similar to the exception to 314.27, but nothing about plaster rings used with ceiling boxes for luminarie support. I can't seem to find any direct reference in the NEC regarding the use of these with a ceiling box when used for lumunaire support. In the past, I have used round metal and nonmetallic plaster rings on 4-square and nail-on ceiling boxes respectively for supporting light fixtures before the 2008 NEC without issue, but I am no longer sure if this is an approved use for these plaster rings.Īre they now relegated to use for wall mount fixtures and utilization equipment under 6-pounds?ĭo these meet the requirements of 314.27 when used with new work ceiling boxes? ![]()
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