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#95637 - 09/23/05 04:54 PM Some Basic Questions
BigJohn Offline
Member

Registered: 03/06/04
Posts: 352
Loc: Boston, MA
Just want to double check:

Is it legal to put connectors inside a j-box (i.e., the locknut on the outside)? 314.16(B)(2) seems to say yes.

Is it legal to install Romex in boxes and light fixtures without connectors (only use bushings)? 314.17(C)Exception says only on single-gang non-metallic boxes. What about multi-gang fiberglass boxes that have no provisions for clamps?

When fluorescent fixtures are mounted overtop of junction boxes, is that box considered inaccessible? 314.29 seems ambiguous. A keyless fixture obviously wouldn't be "part of the building," is a fluorescent?

Thanks.

-John

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#95638 - 09/23/05 06:32 PM Re: Some Basic Questions
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9062
Loc: Estero,Fl,usa
If you turn the connector around you would need a "clamp" deduction in the fill (IMHO)

A luminaire is not part of the building finish.
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#95639 - 09/23/05 07:53 PM Re: Some Basic Questions
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Connectors need to be installed with the clamping means external to the box to be installed per the listing and labeling. The do make snap in non-metallic clamps that can be installed from inside the box for situations where you don't have access to the exterior of the box.

You are required to secure the cable to the box per the last sentence od 314.17(C). The exception is for 1 gang boxes where you are able to secure the cable within 8" of the box measured along the cable.

I have not seen a "Listed" multigang NM cable box that didn't have clamps. Possibly I'm in need of an update

As for the box behind the fluorescent fixture look at 410.14(B)
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#95640 - 09/23/05 08:12 PM Re: Some Basic Questions
jw electric Offline
Member

Registered: 09/08/05
Posts: 108
Loc: Asheboro, NC
Quote:
originally .posted by Big John
Just want to double check:
Is it legal to put connectors inside a j-box (i.e., the locknut on the outside)? 314.16(B)(2) seems to say yes.

Yes 314.16 (B)(2) a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest conductor present in the box.
Quote:
Is it legal to install Romex in boxes and light fixtures without connectors (only use bushings)? 314.17(C)Exception says only on single-gang non-metallic boxes. What about multi-gang fiberglass boxes that have no provisions for clamps?

the cable MUST be secured to the box or piece of equipment
314.17 (C) In all instances, all permitted wiring methods shall be secured to the boxes.
300.15(E). (E) Integral Enclosure. A wiring device with integral enclosure identified for the use, having brackets that securely fasten the device to walls or ceilings of conventional on-site frame construction, for use with nonmetallic-sheathed cable, shall be permitted in lieu of a box or conduit body.
Quote:
When fluorescent fixtures are mounted overtop of junction boxes, is that box considered inaccessible? 314.29 seems ambiguous. A keyless fixture obviously wouldn't be "part of the building," is a fluorescent?

Yes, 410.14 (B) Access to Boxes. Electric-discharge luminaires (fixtures) surface mounted over concealed outlet, pull, or junction boxes and designed not to be supported solely by the outlet box shall be provided with suitable openings in the back of the luminaire (fixture) to provide access to the wiring in the box.

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#95641 - 09/23/05 08:13 PM Re: Some Basic Questions
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9062
Loc: Estero,Fl,usa
I may be in the backwaters of the world but I have not seen a flourecent fixture with a big hole in the back. Do they make them?
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#95642 - 09/23/05 08:49 PM Re: Some Basic Questions
stamcon Offline
Member

Registered: 03/24/01
Posts: 322
Loc: So San Francisco CA
There is often a 2" or so KO in the center of the back. I think 2" is a little small to access the box and I haven't seen a fixture with a bushing, to cover the sheet metal edges of the hole(I think they ought to include one).

steve

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#95643 - 09/23/05 10:14 PM Re: Some Basic Questions
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9062
Loc: Estero,Fl,usa
That sounds like a circular razor blade. How can that be legal?
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Greg Fretwell

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#95644 - 09/24/05 10:24 AM Re: Some Basic Questions
jw electric Offline
Member

Registered: 09/08/05
Posts: 108
Loc: Asheboro, NC
Not if you use one of these




[This message has been edited by jw electric (edited 09-24-2005).]
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#95645 - 09/24/05 12:47 PM Re: Some Basic Questions
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9062
Loc: Estero,Fl,usa
cool.

To be honest I have never seen a box behind a flourecent. They always feed the wiring method directly into the fixture and use it for the box.
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Greg Fretwell

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#95646 - 09/24/05 03:14 PM Re: Some Basic Questions
BigJohn Offline
Member

Registered: 03/06/04
Posts: 352
Loc: Boston, MA
Just some clarification: "Electric Discharge Luminaire," when I read that I assumed it meant for HID lighting like HPS or mercury vapor. Are fluorescents just low-pressure electric discharge?
Quote:
That sounds like a circular razor blade. How can that be legal?
Per 314.17, I don't think it is.

If I don't have some sort of bushing, my solution is to cut an X in the back of the fixture and fold the triangles of metal back, so you have a square hole with rounded edges.
But since that takes more time than simply pulling through the 2" k/o, I've been getting heat about it, which is why I was looking for the Code references that y'all supplied to back me up.

Thanks for the help.

-John

Edited to clarify.

[This message has been edited by BigJohn (edited 09-25-2005).]

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