Posted by sparktrician on January 02, 2015 at 06:44:25 from (70.208.201.16):
In Reply to: Electrical project posted by Nathan (SD) on January 01, 2015 at 14:36:22:
I think what you are trying to get at is how many current carrying conductors can you put in a conduit? The fill chart you found just says how many will physically fit......but there are other considerations......
The 2014 code book (just what is sitting close here) says up to (3) current carrying conductors (this includes neutrals) at 100% rating. 4-6 at 80%, 7-9 at 70%, 10-20 at 50%.
Basically, the more CURRENT CARRYING CONDUCTORS you put in a conduit, the bigger the wire. Now, if you use #12 wire on a 15A breaker, you have effectively de-rated it.
Generally speaking, this is not a huge issues in most installations (although it can be)
IF these circuits are for general purpose receptacles, the likelihood of them all being operated at "capacity" is small.
If these circuits are for dedicated appliances/machines/equipment that will operate at or near capacity.....you better look at it.
I have seen a guy TRY to run a 2" PVC through a hog barn and pull EVERY branch circuit through it (trunk line with lots of boxes) Most of the circuits were loaded at capacity......when that mess was over, the pipe came out with the wire in it still......all melted together in one gigantic mess.....
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