Ceiling electrical boxes come in different depths: 0.5", 1.5", 2.25", 2.75" seem to be fairly common. I'm going to be hanging some lights as well as ceiling fans. I want to have the boxes as shallow as possible in order to keep the service chase shallow.
How do I determine how deep of boxes I need? I'm looking at 1.5" deep boxes — in what situations would I need to use boxes deeper than that?
Best Answer
The number of wires in your box determines the size of the electrical box you need. I personally find 1.5" boxes rather shallow for a fan install since you are often hiding some of the fan wires in the box - this is a bit brand dependent though.
Also the depth of your box shouldn't effect insulation. We are talking about the difference of an inch. The insulation will have a little hump and will perform the same.