4" sq. mounting revisited - 10/29/04 09:32 PM
It really bothered me about those small holes in a 4" square box that are sometimes used for mounting the box so I checked with NEMA and UL and this is what they came back with:
So there you have it.
[This message has been edited by George Little (edited 10-29-2004).]
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I checked with an Industry expert and he informed me that those holes are not for the mounting a box to the wooden 2x4. It will place the nail to close to the edge of the top edge of the 2x4. Mounting of the box this way could compromise the support of the box by allowing the nail to split of the edge of the wood.
These holes were used with a special bracket intended to secure the box to a lathe and plaster wall. The U shaped bracket would be secured to the side of the box by screws through the bottom of the U. One of the legs would be over the top and the other would be under the back side of the lathe. The appropriate size mud ring would be used depending on the thickness of the plaster.
No one makes or uses this type of bracket now. But the holes are still put in the boxes.
These holes were used with a special bracket intended to secure the box to a lathe and plaster wall. The U shaped bracket would be secured to the side of the box by screws through the bottom of the U. One of the legs would be over the top and the other would be under the back side of the lathe. The appropriate size mud ring would be used depending on the thickness of the plaster.
No one makes or uses this type of bracket now. But the holes are still put in the boxes.
[This message has been edited by George Little (edited 10-29-2004).]