bundling question

[chino2002123]

hi all im new to the site. so here is my question........ I have 60 h/rs coming into my panel room, all 12/2 mc. I need to sleeve these coming thru the wall. I have looked up code for bundling and cant find anything on sending only 3 wires per penetration. I have never been knocked down in the past for this. my project manager and i went back and forth about this. also if sticking 10 wires per pipe is considered bundling then why can I run my wires from my trough thru pipe into my panel. to me that's bundling. so any help for this new comer would be greatly appreciated.....thanks

 

[augie47]

Welcome to the Forum.
In the '08 Code, bundling of MC is covered by 310.15(B)(a)(2) Exception 5 (pg 70-146).
See if that helps. If not ask more

The "wire thu pipe" question is clarified in 310.15(B)(2)(a) also

 

[infinity]

If the sleeve is 24" or less and there is no other bundling beyond the sleeve then derating doesn't apply. Since you're using all #12 conductors 310.15(B)(3)(a)(4)&(5) may apply. (4) would allow up to 20 CCC's to be bundled without any derating required.