I am installing a new subpanel in a finished garage. I have cut the drywall out between the studs adjacent to the main service panel. The subpanel is a 125A max main lug panel from Cutler Hammer. I am using a 50A breaker to power the subpanel, using 6/3 with Ground for the connection. I have drilled a 1" hole in the stud between the main and sub panels below the main panel. My questions:
1.) What is the code-approved method of supporting the 6/3 that runs through a 3/4" cutout on the bottom of the main panel? Since it is a finished wall, I am having difficulty figuring out how to get a 3/4" clamp installed from the bottom. I can only think to pop out a larger cutout and put my fingers through that to hold the clamp in the 3/4" cutout while I put the nut on. Can anyone recommend another code-approved approach?
2.) On my main panel, all of my home wiring runs are routed through the top of the panel in a large (2 1/2" I think) male nipple. I cannot tell if there is anything attached to the nipple or not. Should I run all of my new circuits in the subpanel through the same setup? If so, does code require any kind of riser above the nipple?
3.) I have read in some places that 6/3 can be protected with a 60A breaker. Is this the case? Are there any stipulations on when a 60A breaker can be used?
4.) Finally, on my florescent lighting install: I have installed old work boxes above where each light will go. There are 3/4" cutouts in the lights that I plan on running the pigtails through. Can I install 3/4" NM nipples through these holes and simply route the pigtails through them?
I would appreciate responses from anyone who is familiar with code pertaining to these issues. Thanks.
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