Thank you. I get it now.
Here is a more interesting one....
I've got 4 x #10tw75 in a 41mm conduit. How many more #16tw75 can I fit into the conduit?
I go to table 9 and I get my max wire size (area in mm) for 41mm conduit in the 40% fill zone.
Then, I goto table 10 to get the area of #16 to calculate my fill, and I see there is no #16. It stops at #14. How can I get the area size of #16 TW75 wire so I may complete the question.?
Or is it a trick question? ie: some rule about having lower than #14 size wire in conduit, and needing some kind of separation?
hmm.. would this be more appropriate?
heater 2500 / 240 = 10.4 AMPS. x 1.25 for continuous load = 13.
since 15AMP breaker is max 12AMP at 80% load.
Isn't #12 the more correct choice since it can handle up to 16 amp?
btw: I should probably thank you guys for going thru a couple of these with me, and tolerating the side tracking at times.
You did the 80% load thing twice. Once when you did 1.25 x load and then again when you did 80% of breaker.