Видео

My brain hurts

Great breakdown! ⚡

What a great, simple breakdown! ⚡

Amazing video thanks!

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.

Why is the ambient temperature correction always based on the 90C rating? Is there a code section that says to do that?

Hey do you have a video example of calculation of demand from multiple 120/240 ranges?

Step 7. 15% in decimal format is 0.15 not 1.15

Is there anyway I could get an email copy of your flow sheet? Great information thank you

On step #8, I don't understand where NEC 2023 says 25% added to largest motor for individual dwelling unit. You noted in the NEC 125% on 430.24(1) and that 25% used on step 8 with the remaining 100% to be used on another step, but the video didn't expand on that. What's that other step the 100% was used? Say you have a 5hp 1ø 240v A/C load & 10kW Central Heater. The heater would be used per 220.60 comparison A/C=28ax240vx1.25=8.4kW vs. Heater=10kW. Additionally, say you have 4+ fastened in place appliances and the largest motor(all 120v) is 9.8a, which is now the largest for the entire load i.e. step 8. so step 8 would = 9.8ax120vx25% per the steps. However, where in the code does it state this, which I cannot find, except for your statement mentioned above, where then I'm curious where the other 100% of the 125% went per 430.24(1). I see that a 125% was all used on the A/C motor 220.60-Noncoincident load, and if we're considering that article then that's leaving no reasoning for step 8 and the 25% for largest load or at least a direct statement in the Code book for it. Great video, apologize for the TLDR, but I hope you read and help me understand. Thanks.

Why dividing by 240 at the end if some equipment have the KW demand @ 120? I think we should calculate the amps for the 240V demand and for the 120V demand separately, then add the amps .

great great great instruction!

First take care of that annoying cough before you post a 19 min video.

great explanation! I also agree, i wish all instructors, trainers, teachers and professors would teach this effectively

Great

Great explanation!! But shouldn’t the general lighting be included in this case?

he messed up on overload for big motor other than that I like the way he teaches

very good. you simplified everything and went at a pace that everyone could follow.

You're a legend! Thank you

I need an example. Like how do you deal with ECM and variable speed AC units or do you just ignore that and assume it will be changed out in the future. What about heat pumps that can supplement the heat with the heat strips like during defrost? What about the dishwasher and large disposal? Refrigerator? My electric range will pull a little over 50 amps on a 50 amp breaker if all burners and oven are on at the same time, never happen, how do I rate it?

THANKS good explanation, on step 8 you should have added 1680 (25%) + 6720 = 8400 VA from AC motor. ?

what happens if the motor is 400V AC?

Thanks for the information learned a good amount from your knowledge

I agree. Teaching is a gift most of us don't have.

This calculation assumes all inductive loads are power factor 1

There is a standard 70 amp breaker by the way

Thank you sir

How would you decide for a church building , say 8000 sq ft?

FLA not equal to flc? Why put FLC?

What about the exception if there not simultaneously energized you don’t have to derate for conduit fill

If i may ask . Where does 250% come from.

Very nice lecture thank you

I'm a little confused. When trying to choose the appropriate raceway for the (3) 10 awg RHH and the #12 awg RHH, the total cross sectional area totals .1664 in squared as stating in your video. My next step should be to go to Table 4, article 358 (EMT) in colum (over 2 wires 40%) and the closest to .1664 in2 is .213 making my choice 3/4" emt. Is that correct?

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.

Excellent video! @23:00 I just use the inverse of the adjustment factors and multiply. 1/0.71=1.408; 1/0.8= 1.25. For a 50A circuit we will need 50 x 1.408 x 1.25 = we need a conductor rated for 88A. From Table 310.15 B 16 #4 AWG is rated for 95 A which is slightly more than the required 88A.

I was taught that if you omit the AC motor you don’t use that for 125% of your largest motor. So the way I was taught was I would use 125% of the largest motor I used in my calculations which would be the garbage disposal.

Saludos, Los vatios son iguales a los VA, solo cuando las cargas son resistivas. O sea Factor de potencia = zero. Cuando hay hay cargas inductivas y/o capacitivas, el angulo entre la coriente y el voltaje no es zero(0). Watts= VA COS zeta Zeta es el angulo entre la Watts y VA.

on the last question where you gave 50 amp , 6 ccc and 140 degree. I started in the 90 degree col with a #8. You did something different and i dont understand why?

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?

Good day sir, pls how can I get this book.

Do u have any excel sheet

Thanks for the video, but I have a question to the step 8 “largest motor is to be increased 25%”. I thought it has to be 6720*1.25, or I misunderstood this step

Doesn't that say 1/4 HP. Guy in the video says 1 HP

Can you please tell me why the motors doens't have any starter. I leaned dol can use maximum 5hp..

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

Appreciate this video! Is this 2023 NEC compliant?

Explained it better than my school. Thank you.

Super helpful! Thank you

My program has been failing at helping me comprehend this section for over 5 month. You helped me get it in a day before final exam of graduation.

Holy shit! As someone who went to college for electrical engineering, this is the most convoluted shit I have ever seen. Great way to make simple math seem complicated. WOW! I TRULY AM AT A LOSS. 😅