If you had read the rest of the thread you would see that I'm not cutting down boxes, I have poured concrete walls that I'm not cutting or breaking and the boxes that I chose are available in stock from bLowes.
Master Plumber Mark:
there is nothing better than the
manly smell of WD 40 in the air
while banging away on brass with a chisel and hammer...
it smells like......victory......
do not hit your thumb...
Just so everyone's clear: I'm the POODLE in the picture ("french", get it?) The hot woman is my wife.
Run single cables into the boxes and terminate them in junction boxes above the ceiling. Interconnect everything in the junction boxes, which you can make as big as you want. Only hitch is the junction boxes have to be accessible; you could put them anywhere -- "above the ceiling" just seemed easiest, but if they're not accessible there, put them somewhere where they are.
One other thing to remember: if you're mounting a box like this on a hard surface at the back, drill a clearance hole for the grounding screw. Especially important to remember if you're using a powder-driven fastener to mount the box.
Last edited by Mikey; 01-18-2008 at 10:58 AM. Reason: Note about hole for grounding screw
Thanks, Mikey. I didn't think of that. These boxes do not have the raised little bump for the screw clearance. Can I bond the box by shooting a fastener with a washer over a loop of ground wire?
I doubt it, since they even require green screws these days (apparently signifying Code-approved). I'm sure somebody can come up with the Code reference.
250.126 requires green screws with a hex head for EGCs, or a green nut, or a green pressure wire connector. on wiring devices. 250.8 prohibits sheet metal screws for connecting grounding conductors to enclosures, but (you're right) doesn't say what is required. 250.148 says "grounding screw that shall be used for no other purpose". There may be other advice scattered in the Code, and all this is based on the 2005 Code -- don't know what 2008 (or your local AHJ) says.
Nice long thread about this on Mike Holt's forum: http://forums.mikeholt.com/showthread.php?t=76912
I used to use one of the clamp screws in a box (after removing the clamp) but a local Master Electrician who advises me said that wouldn't be acceptable to our AHJ. An electrician in Pittsburgh says his AJH requires the green screws.
Bottom line -- if you use the green screws (which, BTW, one of Mike Holt's posters said weren't Listed) you'll pass. If you don't, you might not.
Thanks. I'll go with a green screw.