Ceiling Box B520, question about weight

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Old 01-31-16, 03:17 PM
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Ceiling Box B520, question about weight

I'm installing a 18lb light fixture. The existing ceiling box is a B520 (plastic side mount). It has a little give on the one side (presumably the side that is not attached to the joist) however I believe it is rated for 50 lbs after looking up model number. I have tested hanging the fixture and it pulls away from the ceiling to that one side by about 1/4", so from the ladder I can tell it is not flush with the ceiling. I wanted to see if this was normal with a side mounted ceiling box? Should I be concerned that this box is not strong enough since it does not remain flush. Suggestions welcome. Thanks!
Side note : There is no ceiling access via attic.
 
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Old 01-31-16, 03:37 PM
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Need a fan rated box.
No clue what a B520 box is. Got a web site?
No picture so hard to know what your dealing with.
8-32 or 10-32 screws in the box?
 
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Old 01-31-16, 03:50 PM
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http://m.platt.com/platt-electric-su...spx?pid=186433

I did not install Ceiling box. Going by model number inside box.
 
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Old 01-31-16, 04:21 PM
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I'm installing a 18lb light fixture.
A standard electrical box will handle an 18lb fixture with no issues. Most boxes are rated for 50lbs.

It is possible the box was not nailed tight. You can add a screw driven through the side up towards the back of the box.
 
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Old 01-31-16, 04:36 PM
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Right, from what I've read about this model it can handle 50 lbs.
The one side does give though and made me question it's strength. Was hoping to hear the gap I'm seeing is normal - otherwise I feel I'll need to replace with one that brackets between the joists but this will require cutting into the drywall which I was hoping not to do.
 
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Old 01-31-16, 04:40 PM
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I may try adding an extra screw thanks.
 
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Old 01-31-16, 04:41 PM
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Not a fan rated box.
One like this can be installed from below the ceiling.
Raco RETRO-BRACE with 4 in. Round Ceiling Rated Pan, 1-1/2 in. Deep with 1/2 in. KO's (6-Pack)-936 - The Home Depot
 
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Old 01-31-16, 04:50 PM
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Correct, but just to be clear I'm not installing a fan. But it is a moderately heavy light fixture and I get your point that it will have more strength with the brace.
If i do go that route can I pry off the old ceiling box ...any suggestions on how to get it out with minimal damage to my ceiling.
 
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Old 01-31-16, 04:56 PM
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Got a sawsall with a short bimetal fine toothed blade?
Should take a whole 5 min. to cut it out.
 

Last edited by ray2047; 01-31-16 at 05:23 PM.
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Old 01-31-16, 05:24 PM
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Mod Note: No need to remove and replace the box. The O/P is installing a static not dynamic load so a fan box is not needed.
 
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