I have a big light to hang and the mounting plate in the light has 2 holes for 2 #8 32 screws that mach the holes in the electric box ( located in the ceiling). I would like to know if the two (#8 32)threaded holes in the j box would hold a 80 pound light?
2007-04-12 17:21:19 · 4 answers · asked by Gonzalo C 1 in Science & Mathematics ➔ Engineering
Thats a big, heavy light. You haven't stated what the building is made of. If I were you, I'd make sure the box is heavily reinforced before putting a potential family-member-killer above your heads. You need to found out how that box is mounted in the ceiling. Personally I'd find a way to bolt that light, at least with one screw and bolt and some washers, into a ceiling beam. If that box is directly screwed onto a beam, you could possibly drill a hole up through the box and the beam to mount the bolt. Then use the two screws just to hold the mount and keep it from turning.
2007-04-12 17:29:24 · answer #1 · answered by FourWheelDave 3 · 1⤊ 0⤋
Whether the screw will hold (probably) it would be best not to trust them or the nails that probably hold the box in place. It would be best to have a board running between the studs or on top of the studs if the attic is accessible - then long screws through the bottom of the box to screw it to the board.
This is a lot of weight and if it is hanging by a chain, normally a pipe would be run through the center of the cover plate, though the knockout in the center of the box and through a hole drilled in a 2x4. The box would then provide no structural factor, but merely protect the wiring from damage, which is its purpose.
I wouldn't go over about 30 pounds, especially if there is some risk of the chandelier being struck - like with my head if I walk under it. Double check with the people who made the lamp and see if they are knowledgeable or amateurs.
2007-04-12 17:32:26 · answer #2 · answered by Mike1942f 7 · 1⤊ 0⤋
Unsafe. You need a special box of the sort used for ceiling fans; it has a steel bridge extending between two joists or rafters.
2007-04-12 17:27:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Be careful about this install. there are extra heavy duty octagonal boxes made for ceiling use. get a real electrician involved....it's way cheaper than medical bills.
2007-04-12 17:45:49 · answer #4 · answered by Anonymous · 0⤊ 0⤋