Return to the Electrical Wiring Forum | Post a Follow-Up

 o
slim or low profile junction box

Posted by mabeldingeldine (My Page) on
Tue, Jan 25, 11 at 10:12

In replacing a ceiling light fixture, I discovered that the existing junction box to which the light fixture is mounted is not sitting flush with the drywall, but protrudes from the drywall but 1/4 to 1/2 and inch (i.e. it isn't level or straight).

This is an old house, and the ceiling is in what was an el off an old Cape, so I am not surprised, but...

Is there such an animal as a low profile or slim junction box which could be used to replace the current box, and which would be able to bear the weight of a track light fixture?

Thanks for any advice!


Follow-Up Postings:

 o
RE: slim or low profile junction box

There isn't any junction box that can bear the weight of most track lighting. The track is supposed to be attached the the ceiling elsewhere. Are you saying the box sticks out too much for the track to sit properly?


 o
RE: slim or low profile junction box

Yes, the box sticks out beyond the ceiling drywall. The former light fixture disguised this problem. I might have the wrong term, it is the box to which an overhead fixture was wired. I removed the fixture to replace it, and discovered this.

I would like to add track lighting that sits flush with the ceiling, but the protruding box prevents this.


 o
RE: slim or low profile junction box

How is the existing box attached to the ceiling? I don't know how handy you are, but the options would be to reset this box so it's flush, or to replace it with a less deep box that will be flush. Whether you can go with the latter approach (smaller box) will depend on whether you can satisfy the box fill requirements of the electrical code with a box of less volume given the number of wires you have in the present box and what their gauges are.


 o
RE: slim or low profile junction box

If the track lighting has a hole large enough for a cable clamp you may be able to eliminate the box completely.


 o
RE: slim or low profile junction box

To clarify, the track will eventually also attach to the ceiling with molly bolts.

I will take a look at the box and try and determine how it is currently attached, I'm not sure. I need to wait until my DH is home as I don't want to tackle this without backup.

Brickeyee, what is the cable clamp to which you refer?

Thanks, everyone for your help. I learn so much from GW!


 o
RE: slim or low profile junction box

The cables used for permanent wiring use clamps were they attach to a box.
Some fixtures are also designed to have a clamp installed so that a cable can enter directly.

The hole would be around 3/4 inch, usually at one end of the fixture.

The problem with smaller boxes is box fill.
The NEC requires a certain amount of volume based on the number of wires, devices, and internal box clamps inside the box.

The thinnest box for general work is about 1.25 inches deep and 4 inches square.
You can install a plaster ring (making the overall depth 1/75 inches).
If the box is in a joist cavity there are mounting methods that can recess it deeper unless something structural is in the way.


 o
RE: slim or low profile junction box

This sounds like a single story house so why not
go into the attic and reset the box flush with the ceiling?
If it's not accessible from the attic use a fan box to straddle
the stud. It should provide enough CU. In. for the box fill.


 o
RE: slim or low profile junction box

"If it's not accessible from the attic use a fan box to straddle
the stud. It should provide enough CU. In. for the box fill."

The "fan boxes" often rely on the canopy volume to meet box fill.

Track lighting does not normally have a canopy.


 o
RE: slim or low profile junction box

Failing that the link below is 24 cu.in.

Here is a link that might be useful: SBFAN New/Remode Box


 o
RE: slim or low profile junction box

"Failing that the link below is 24 cu.in."

And VERY deep.

The fan boxes that come with an expanding screw brace and fit through the box hole are very nice for rework and are nice and solid with locking hardware to mount the box to the brace (nylon locking nuts).


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here