hi thank you all for the help about testing circuits , yes Im familiarized with lock out/tag out and Its a good way to work safely. Ok my question now is aobut panels divided by sections . I have a panel that is divided in 3 sections , like you know the code says that we can have 42 breakers per panels (100 amps main feeds 120 V receiptacles),my question is :If I have some of the circuits that belong to the first section piped to the the second section (they mis-laidout in the slab)and I need to bring these circuits to the first section panel can I use the 2" nipple that I have between the first and second section for my feeders to pull my circuits ? or I need another nipple just for branches besides this nipple to feed the second section? is there any article in the code about this? Thank you
"Using the panel as a raceway is also allowed." Very true, but a lot of people get wierd about it... Feed thrus, and wire nuts in a panel are contensious items. The longer you're in this Trade, the more opinions you'll come across. Some will make sense, some will not.
Anyway, as far as running with feeders, and through nipples it's very important to stay to the allowable derating. It could throw that plan out the window. See 310.15! But as long as you're covered there, it should be ok. Believe it or not, the best tool in your belt could be a calculator! You'll have more to think about than math....
Another word of advise.... Obtain a Handbook version of the code, it will clear up alot of vague items. It's got commentary on every third code, or so, in plain english.
Mark Heller "Well - I oughta....." -Jackie Gleason
Re: nipple between 2 panels#39794 07/02/0410:54 AM07/02/0410:54 AM
If the nipple is under 24" long than you have exception #3 in 310-15. If it is aloud in NEC it dose not allways mean it is best solution. Maybe use a seperate nipple. Or better yet can you figure another way into the right panel. I don't know how many wires your talking about. It might make the on panel a rats nest. That could lead to confusion and someone making a mistake. Out of phase networks, nuts in wrong panel, mismarked breakers, or pushing fishtape into wrong panel. You or the next guy.
Re: nipple between 2 panels#39795 07/02/0411:22 AM07/02/0411:22 AM
When you have two panels in close proximity to one another, and you need to provide a conduit nipple between them, then cut your rigid galvanized nipple such that when couplings are installed on both ends, it is a snug fit (sometimes a single coupling can be used with no nipple). Install two chase nipples through the KOs and into the couplings to complete the job. Note: this does not provide for a good ground, I always include a bond between panels if there is no other bond already installed.