BAck to back outlets???

[nathan]

Is it a violation for boxes to be back to back in any wall. I know in most areas you cant in a common wall for fire rating pourposes, but what about a regular dividing wall. If there is such a code please state it. Thanks in advance.

 

[roger]

Re: BAck to back outlets???

Nathan, no there is no code (could be local) prohibiting back to back boxes besides your mention of fire walls.

Some architects will spec this for sound proofing but this is design.

Ryan or one of the other inspectors may have more on this.

Roger

 

[ryan_618]

Re: BAck to back outlets???

As Roger stated, this is not an NEC issue. Section 711 of the IBC addresses back to back boxes in a fire resistance rated wall as follows:

Outlet boxes on opposite sides of the wall shall be seperated as follows:

1)By a horizontal distance not less than 24 inches;
2)By a horizontal distance not less than the depth of the wall cavity where the wall cavity is filled with cellulose loose fill or mineral fiber insulation;
3)By solid fire blocking in accordance with 716.2.1; or
4)By other listed materials and methods.

I think to use number 4 you would have to submit an alternitive that complies with the ASTM E119 standard testing method for rated assemblies.

If this is a regular old wall you should have nothing to worry about. I used to try to do this so that I could just use a chase nipple and only have to pipe to one box.

Hope this helps,

[ September 30, 2003, 09:50 PM: Message edited by: ryan_618 ]

 

[Guest]

Re: BAck to back outlets???

Does Raco still make their 2x4 through-wall box? That would support the back-to-back argument.

I notice Raco still makes a 3-0 pancake box. Where are those allowed?

I know the 4-0 is permitted for end runs of #14/2.

 

[nathan]

Re: BAck to back outlets???

Thanks guys I thought not but I wanted to make sure.