NEC Motor Load Calculations Example

Example calculation for motor calculations per the national electrical code.

[Sincoola]

I took this guys full prep class a few years ago. Passed my masters exam on the first try thanks to it! great teacher

[soundman]

Very well laid ou, t with Code articles as references. Nice job!

[TheMadhatter]

Information is thrown out very thoroughly. Thumbs up!

[stevenwarren]

The overloads are calculated at nameplate FLA, right? Everything else is calculated from the FLC from from 430 tables, am I right about this?

[JesusCruz-wtzp]

Your videos are great. Please do more ..

[controlsgirl]

Great example!! Way to walk through it!

[daltondelaney]

Why do you always use 75C degrees column for motor feeder wire size? (8:30 in video)

[kylecropanese]

Thank you so much about to go for my exam shitting bricks this helps so much

[Luminous]

I've noticed you use 75° column for the branch ckt conductor size. However I was told to use 60°C column for circuits rated 100 amperes or less (per NEC 110.14-C) regardless of conductor insulation rating. Was there an exception that I missed?

[EbagOmocaigid]

wouldn't the feeder size in step 5 be calculated as THWN-2 like the motor wires? And thus be a number 6 wire rated for 75 AMPS? Great video though, thanks

[juliorojas]

Service factor is 1.4 and the code is 1.5 or grater to be × 125%. If is not 1.5 por greater it should be × 1.15.

[BobbaFett]

i have same question as others on using 75C when ampacity column. 75C can be used only when terminations are also 75C. why is 75C used here?

[mcarroll]

When you size breakers for motors, wouldn’t you round down to the next standard circuit breaker size?

[MrTomObama]

On step #3 if its THWN-2 at 9.5 amps wouldn't the answer be 18 for copper? Or is it 14 because of the temp rating? Confused. I understand how you got the answer for the 65 amps just not the 9.5 amps.

[MensLifestyle]

For Step #6, why wouldn't you add 150A to 20A for the remaining motor? Why did you only add the FLC and not the Branch Circuit protection from step #4 like you did for the larger motor?

[thanmaysudev]

Could you please tell me why the 40hp motor doesn't have any starter

[mcarroll]

Wouldn’t you size your OVERLOADS to your FLA on the motor? Not your FLC from the code book?

[Mike-eczp]

Where does table 430.22(E) fall in these steps? If asked for any of these rating percentages? Answer be helpful

[Primez]

You dont need the FLA to do these calculations?

[oscarization]

I think you made a small mistake by multiplying your overload protection device with your FULL LOAD CURRENT instead of your FULL LOAD AMP??