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Old 04-30-2009, 10:06 PM   #1
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Does NEC rules for JBox include this? - pic


While, technically, the joist with the JBox shown are not load bearing (it supported a formica 'false' ceiling) I don't think the NEC rules for JBoxes encompass this use.

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Old 04-30-2009, 10:12 PM   #2
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Does NEC rules for JBox include this? - pic


Not the prettest box I've seen, but it seems to be installed in a way as to be flush with the ceiling.
As long as the box is mounted to something properly, I think it could be allowed.

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Old 04-30-2009, 10:18 PM   #3
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Does NEC rules for JBox include this? - pic


The Jbox is NOT screwed to the T&G (that's 9 inches above, I guess it's a little hard to tell from the pic). It's screwed to the plank on the left and right by way of the knock-outs and a few really big washers. The planks were toenailed to the adjacent joists and did not connect to each other - just the JBox.

I hate to see what would have happened if they hung a light fixture that weighed more than a pound or two.
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Old 04-30-2009, 10:25 PM   #4
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Does NEC rules for JBox include this? - pic


I can see it better now that you explained it to me.
Must be a light, light!
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Old 04-30-2009, 10:32 PM   #5
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Does NEC rules for JBox include this? - pic


Quote:
Originally Posted by Leah Frances View Post
While, technically, the joist with the JBox shown are not load bearing (it supported a formica 'false' ceiling) I don't think the NEC rules for JBoxes encompass this use.

314.23 (D) says:

(D) Suspended Ceilings. An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than 1650 cm3 (100 in.3) in size and shall be securely fastened in place in accordance with either (D)(1) or (D)(2).
(1) Framing Members. An enclosure shall be fastened to the framing members by mechanical means such as bolts, screws, or rivets, or by the use of clips or other securing means identified for use with the type of ceiling framing member(s) and enclosure(s) employed. The framing members shall be adequately supported and securely fastened to each other and to the building structure.
(2) Support Wires. The installation shall comply with the provisions of 300.11(A). The enclosure shall be secured, using methods identified for the purpose, to ceiling support wire(s), including any additional support wire(s) installed for that purpose. Support wire(s) used for enclosure support shall be fastened at each end so as to be taut within the
ceiling cavity.


I guess it is somewhat subjective as to whether this is properly supported under the NEC, but I would subjectively say, no. It just doesn't look supported by either a framing member or approved support wire system.
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Old 04-30-2009, 10:37 PM   #6
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Does NEC rules for JBox include this? - pic


Quote:
Originally Posted by Leah Frances View Post
The Jbox is NOT screwed to the T&G (that's 9 inches above, I guess it's a little hard to tell from the pic). It's screwed to the plank on the left and right by way of the knock-outs and a few really big washers. The planks were toenailed to the adjacent joists and did not connect to each other - just the JBox.

I hate to see what would have happened if they hung a light fixture that weighed more than a pound or two.
That's a big 'fail' on the adequate support provision. At least here in Louisville, this wouldn't pass.
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Old 04-30-2009, 10:54 PM   #7
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Does NEC rules for JBox include this? - pic


I don't think a load bearing jbox would pass anywhere.

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