metal 4"Sq. box

[Robert Mattison]

The NEC code book 2008 edition.

Can a 4"Sq, x 1-1/2" box extension ring be added to an existing
4"Sq. x 2-1/8" deep box.

When finish, I will be installing a 4"Sq., 2 gang, 1" raise, plaster ring so I
can install two switches inside this box. (note: when finish this box will
be cover with sheetrock, expect, the open front, which is where the
switches will be visible.)

Does the NEC allow or probibit this practice? :cool:

[Jerry Peck]

The NEC code book 2008 edition.

Can a 4"Sq, x 1-1/2" box extension ring be added to an existing
4"Sq. x 2-1/8" deep box.

When finish, I will be installing a 4"Sq., 2 gang, 1" raise, plaster ring so I
can install two switches inside this box. (note: when finish this box will
be cover with sheetrock, expect, the open front, which is where the
switches will be visible.)

Does the NEC allow or probibit this practice? :cool:


Robert,

The NEC will not prohibit you from doing that, but the 2x4 studs, which are only 3-1/2" deep, will prohibit you from doing that.

*IF* you have *NO* protrusions out the back side of the box (you likely will have) then the box and extension ring will be 3-5/8" deep ... in a 3-1/2" deep wall ... :confused: ... and then the screws out the back of the box ... :eek:

[Robert Mattison]

A big thanks, to you Jerry, with your answer.

When I have a problem, its nice to know, that there people like you
involved with this Form, that can quickly supply the answer I needed. :) :)

But what I really like about you, is you go to great lengths to supply a detail answer.