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I forgot to add, for branch circuit having motors not over 1HP individually, not exceding 6 FLA, and having ligthing loads: Do you just sum all the amps and check if they not exceed the 15 or 20amp protection? Hehehe, thanks :).

Hello all. I have an issue with article 430, I read and read... and read and read, but I cannot find the answer to my question. I think the NEC is very clear when it comes to branch circuit conductor rating and protection against SC and GF rating, even feeder protection rating its quite clear...

I agree with you all, I do not intend to use 75C rating for branch circuits, maybe for some feeder circuits I will, but mostly wanted to make sure that I was getting things rigth. Thank you all for your answers :).

I want to know if my interpretation of 110.14(C) is correct. Can I use the 75°C column ampacities for all gauges? (given the fact that I use 75°C or 90°C insulation and my terminals allow for 75°C wires) I'm 99% certain that I can, but I want to make sure. I've seen a lot of devices that allow...

Thank you very much! I'll look for the info in those standards :-).

Thank you very much for the information :-).

Thank you all for your quick answers :-) So in the end, the best source will always be the manufacturer. Do they charge for this information?

Thank you very much :-) I'll check the info and get back at you.

Hi all, this is my first post ever. I have recently graduated, so in a way, I’m still studying. I'm trying to find some kind of transformer impedance "range" for different types of transformers, to use in short-circuit calculations. It's my understanding that, you never get to know the...