Box for the Low Voltage jacks

[Pacman7]

Does the NEC code allow Plaster rings without a box, in a drywall wall in a commercial building?

 

[Sierrasparky]

why not. There are listed such devices.
The only caveat is if it is a fire rated wall or the designer specifies other for reasons as sound or draft.

 

[Dennis Alwon]

I think that is a building code and not an NEC issue. Unfortunately, I do not know the answer

 

[JFletcher]

I have seen plaster rings screwed directly to the stud on interior, non-rated (the wall between the bathroom and bedroom in a hotel for example) walls for thermostats... We never use open back boxes or LV-1 boxes in commercial though, most walls in hotels are rated for fire and sound, and since 95% of our devices or in those walls, or ceilings, you must use a full or closed back box in those cases

You would need to look at the listing/instructions of the plaster ring to see if screwing it to the stud is permissible by 110 3B. Also have a look at 300.21. the rest of it would be in your local building codes.

 

[bubbarhd]

Building code/Energy code often comes into play on exterior walls. Fire rated walls also make open rings not usable but otherwise ok to my knowledge.


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[Little Bill]

Are you guys calling these plaster rings?

If so, they are not called plaster rings, they're called low voltage brackets. A plaster ring goes on a box.

 

[infinity]

Plaster ring.

Here's another thread. Please do not post the same question twice.

http://forums.mikeholt.com/showthread.php?t=194491

 

[hbiss]

Old work and new work. I use the "brackets" (actually Caddy MPLS) for cut-in work. For new work I use a plaster ring or the Caddy MP1S (shown in that other thread). Plaster rings are cheaper.

-Hal