Derating and Current Carrying Conductors

[Jimmy7]

I know I could have did this a different way, but now I’m curious of the derating and current carrying conductors.

One single pole and one 3-way for basement lights in an unfinished basement on a 15 amp circuit, all conductors in the conduits are #12.

Top left box has 14-2 feed, and a 14-2 that goes to a garage light. The neutrals in this box are spliced and there is a white dropped down to the switch location. The two black wires are dropped down for the single pole switch, and I also dropped a ground wire.

The top right box has a 14-3 for a 3-way, and a 14-2 that goes to a basement light. From the 3-way switch at the bottom, I have a feed (Hot and neutral) a common, two travelers and a ground that goes up the conduit on right to the 4” square.

What is considered a current carrying conductor when you’re sharing a conduit with a feed and conductors used for a 3-way switch?

Thank you

 

[CoolWill]

Only one traveler at a time is a current carrying conductor. So the right pipe only has 4 CCCs. I'm not entirely sure the code addresses it, but it wouldn't bother me one bit to consider it this way.

 

[LarryFine]

I would have used one box and one EMT.

 

[Jpflex]

Only one traveler at a time is a current carrying conductor. So the right pipe only has 4 CCCs. I'm not entirely sure the code addresses it, but it wouldn't bother me one bit to consider it this way.

I thought the code didn’t require travelers or non coincidental wires to be counted as current carrying conductors (wires that cannot be turned on simultaneously)

 

[Dennis Alwon]

Here is the note o the table

*Number of conductors is the total number of conductors in the raceway or cable, including spare conductors. The count shall be adjusted in accordance with 310.15(E) and (F). The count shall not include conductors that are connected to electrical components that cannot be simultaneously energized.