I'm putting fan rated ceiling boxes in the bedrooms of my house since I need to replace them anyway (see other thread) The boxes that I can find do not have cable clamps built in but round knockouts on four faces. I'm planning on using these:
Also, is there any prohibition against putting the clamps in "backwards" that is with the screw and clamp inside the box? I don't need to do this for this job but I could see some situations (e.g. putting a box in an existing hole using existing wiring) where that might be desirable.
nate
(doing my laundry while waiting for the girl to come home, then I'll be back up in the attic again...)