In my first post I wrote that there were more then 15 unlabeled circuits in the old panel and everyone that wrote that they could complete the circuit labeling and comply with section 408.4 in a hour or so and even a couple of hours is not taken into consideration of the mandates of the section. The mandates are nearly impossible to comply with when doing a panel swap where there are more then a few unlabeled circuits in an occupied residence.
In the first two lines of this section there are some key words, example: Line #1, Every circuit.....shall be identified to its clear, evident and specific purpose.
OK, that mandate is not to hard to comply with, NE bedroom, 3rd floor, lights and receptacles. I think that is clear and shows a specific purpose, unless maybe a second floor bedroom is tied into this circuit, better check that and maybe the first floor family room etc. Hmm, sometimes there are outside loads that are tied into family rooms, better check all of them, also check the basement, to make sure there nothing tied into there.
Line #2 of the section mandates that the identification include an "approved degree of detail that allows each circuit to be "distinguished from all others". Wow where do I go to get this "approved degree"?
Bummer, got to go back to the NE bedroom on the third floor now and make sure there not a second circuit up there somewhere. OK, need to check every single receptacle in this third floor bedroom to know for certain that there is only 1 circuit up here, because if there is a second one I need to "distinguished" it from all others. Bummer, now I got to move the bed out I think there is a plug there also, and that big dresser is in the way and also has a receptacle behind it. Don't forget the closet with lots of clothing and junk in the way, there an attic access panel up there in the closet, bet there is a light up there somewhere. Boy these people keep a sloppy house. Home owner now whats to know what I'm doing in her daughter's room and why I'm going through her closet.
Well got this one circuit done, only 14 more to go! Bummer, forgot the second floor bedroom was on the same circuit, might be another circuit there also.
You guys are probably thinking I went to far here, sorry, but if you don't follow the letter of this section and do less, then, it's YOU who are violating the code. I rather leave the circuits unidentified.