Forum Title: Re: 4" round plastic box
An electrical contractor told me about plastic 4" round ceiling boxes. He said that in order to be rated for 50 lbs. you had to install a screw in the box and attach it to the ceiling joist. I asked him, OK where does it say that? and he said he the last AHJ told him. Now I don't know if it was true or not, and I was trying to find something on either Slater or Carlon website, but all I found is that those boxes are rated for 50lbs. I tried to find installation instructions, but nothing was written there either.Anyone heard this before?
Category: General Electrical Discussion Post By: Jeremy Atkins (Spring Lake, SD), 03/23/2017
I don't see anything that says that either.Is he saying you need to drill a hole in the side of the box and install an additional screw?

- Peter Jones (Waltonville, IL), 03/25/2017

It's been awhile, but this sounds somewhat familiar... Some Boxes are supposed to be for Fans, but say the Fan has to be supported indepentantly of the Outlet Box (screw through Box). Maybe that's what he means?I found the following for one Brand: Quote Weight Limits: Fans and fixtures are supported independent of outlet box. Mounting screws go through box and into joist.Box will support up to 70 lbs. for fans and 90 lbs. for fixtures. This sounds a bit misleading, as the box isn't actually supporting anything if the mounting screws go into the joist.http://www.cooperindustries.com/con...iling%20Fan%20Boxes%20and%20Supports.pdfBill

- Gerald Murphy (Craig, IN), 03/25/2017

Harold:Do you mean the TP 16511 in Bills link??The TP 1300 or equal by other mfg does allow the fan support hardware to be attached direct to framing. The TP 16511 type is a nail-on & 35# rated, and I know of no provisions to 'attach' any type of fan braces to that box.I'm quite sure that some enterprising person could mount a 2x? over the top of the box & run lags/screws into that but ...bye, bye listing.

- Jessica Lewis (Bern, WI), 03/25/2017

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