I'm having a bit of a tough time understanding whether or not to count my neutral as a current-carrying conductor. How do I know if the conductor carries the 'unbalanced current from the other conductors of the same circuit' or not (310.15(B)(4)(a))?
As an assignment I'm designing a 3-circuit 240-volt solar system.
Using #10 wire I start out with ampacity of 40 amps
Because the conduit will be installed 1" above the roof I add 22 Celsius to the ambient temp and then derate the capable ampacity by 71%
Here's where I don't know what to do: to derate by 80% for 6 conductors (3 black, 3 red) or by 70% for 9 conductors (3 black, 3 red, 3 neutral).
I appreciate the help. Please excuse the ignorance, trying to learn this stuff on my own and with the help of you guys.
As an assignment I'm designing a 3-circuit 240-volt solar system.
Using #10 wire I start out with ampacity of 40 amps
Because the conduit will be installed 1" above the roof I add 22 Celsius to the ambient temp and then derate the capable ampacity by 71%
Here's where I don't know what to do: to derate by 80% for 6 conductors (3 black, 3 red) or by 70% for 9 conductors (3 black, 3 red, 3 neutral).
I appreciate the help. Please excuse the ignorance, trying to learn this stuff on my own and with the help of you guys.