Question about Low-Voltage outlet/boxes for code

[puttsy]

Hey all, I've got a bit of an odd scenario and need to know what's "code" and what's not.

I am replacing a low voltage switch for a power condition (pro audio) in a facility and the install company DID NOT put a low voltage outlet box in the wall to mount the plate/switch to. They just drilled into the wood and mounted the switch that way. Well, I'm replacing said switch due to some issues with the current setup.

What is the code for low voltage switches and mounting? Do I NEED a low voltage box in the false wall to mount the switch/plate to or, is it kosher to leave it as is? Personally, I feel it VERY unprofessional that a box was not installed initially and also feel it violates electric code but, can't find any references to the code (aside from the duh clause) that would require it.

Again, this is LOW voltage. There is maybe 12v max (signal) running to the switch on the wall-plate. It is simply a push button to start the on or off sequence for the equipment. Furman power conditioners and switches and sequencer if you are curious. I'm not looking for an aspect on the audio end, I need the electrical regulations as to how I show proceed and replace the switch without making ME liable for wrongfully installed equipment.

 

[matt151617]

The "box" is not needed. If you see one in the store, it is simply a ring of plastic, not even really a box. The only purpose of the low voltage boxes is so the faceplate has something to attach to.

 

[Norcal]

There are low voltage rings made from metal or plastic, until I found them used to use Allied Molded single gang boxes that I cut the back off of & used Hold-Its / Madison clips to secure them.

Caddy is the go to place for items like this: http://www.erico.com/products/CADDYcfcMntngPltBrcktsMtllc.asp

 

[puttsy]

Thanks guys! I knew it was basically just a plastics frame, I just wasn't sure if it was required, even though it really doesn't serve any security/safety purpose. Thanks for the link and the info. I'll probably pick one up and pop it in while I do some other odds-and-ends but, glad to know I won't see any issues (legally etc...) for being the last person to work with the switch/panel. Whoever installed the panel in the first place just drilled into the wall (hollow wood) and screwed the plate on that way, which personally I think is a bit unprofessional (it was installed by an established/'reputable' installation company) and an unnecessary short-cut but hey, I guess that's why I get to go in and clean up the pieces...for a step below peanuts.

 

[jeffmoss26]

I prefer Caddy MPLS brackets for low voltage. Installed several of them this weekend for phone jacks.

 

[BFBOB]

I'm a Communications Contractor (low voltage electrician). The only application where a box is required is in commercial fire alarms. Otherwise, a backless "box" like the Caddy MP1P is highly preferable to just attaching to the wall in most cases because it provides a solid mounting for the face plate. In new construction, an on-stud mounting ring (Caddy makes a nice one that also has a provision for attaching conduit) is best because it gives the drywall guys a target. They'll cover up the odd box anyway, but why make it easy?
I sometimes use boxes, in new or old work, but mostly the backless mounting rings. I occasionally, but seldom, attach a face plate directly to a wooden wall; NEVER to drywall.