CALCULATING THE CMA OF CONDUCTORS

Wire size is based off of the circular mil area of a conductor. This video walks through how that works.

[electricianron_New_Jersey]

Beautiful. I'm a licensed electrician and I'm in my second year of teaching Y1 apprentices for the NJ-IEC. We do a lot of VD/ CMA calculations and there's a lot of it on the mid term and final exams. Of course if you don't do these calculations every day it's easy to forget them. That's why I searched for this video. It was helpful. Thank you!

[Moneybagsss]

These videos are really helpful, I am on my first year of electrical!

[lax_player]

Dude thank you so much . I’m taking my final electrical exam in 2 days and this just saved my ass so much . I completely forgot about cma/sma for the exam

[kurotetsu]

Thank God this video exists. I just finished the last item in my exam

[Flashjhonson]

My question is, why aren't we using PI in these formulas???? it seems like we are taking a square

[mohamedrashad]

Please I need urgently the source of the formula you used ( cmil = inches*1000 ) squared, I need a source or code for my work.

[kevenalvarenga]

Could you attach a link to the Chart/Table you displayed towards the end of you Video?

[kothaguru]

Is this conductor in the 2018 Code Book?

[Alleycatandbobcat]

is the chart that you used for this video also found in the Canadian Electrical Code book?

[Hopeless_and_Forlorn]

Seems to me you have this whole exercise backwards. You are given a piece of wire, it is easy to determine its gauge without resorting to calculation of cma. So you started with a given wire gauge, calculated the cma, then converted it back to (probably) the same gauge. What have you gained? Assuming the wire is from a properly functioning installation, just replace it with the same gauge. A more likely use of cma occurs when you are terminating several wires of different gauges in a single terminal. To determine the proper terminal size, you find the sum of the cma of all the wires and then take that number to the terminal specification charts for the correct selection.