NEC Dwelling Service Calculations

How to perform dwelling service calculations per the national electrical code.

[soundman]

One of the best walk throughs ever! 20min. instead of 120min. all to the point and simple, thank you!

[ryanmott]

Thank You! I was trying to knock the dust off and this helped!

[comescuy]

Hi Bluegrass College. I'm getting my electrical license, and is an excellent demonstration and explanation of definitions, thanks you very much. It's very useful.

[WorldviewWarriors]

Great stuff! Is it possible to get a copy of that how-to sheet?!

[TexasEngineer]

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?

[ElvisTruong-bf]

Thanks for the great video. Really was a good guide. Is it possible to make a video like this but in multi dwelling apartments?

[jeisonmercado]

Is there a way to get a copy of those handouts?

[davidjoly]

Thanks for posting this lesson. I have a newbie question. Are microwaves and toasters, and other small kitchen appliances typically covered under the "small appliance" circuits? All the examples I looked at have only the two 1500VA circuits. For a large house, there could be more than one kitchen. Not saying this is the norm, but given more than two small appliances are expected, should we be increasing the circuits beyond the two?

Also, is there a distinction made between fixed in place microwaves and countertop microwaves?

Thanks!

[rjhoody]

Do we need to measure the square feet of each level of the dwelling? E.g. first floor, second floor, third floor?

[aaronosayenum]

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

[WonderBredRaider]

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.

[tonynembhard]

I’ve look at the 2011, 2014 and 2017 cannot find table 310.12 anywhere.

[WoodyWard]

Great but I don't think they'll let me use a code book that has highlights, hand written foot notes, and extra pages glued on it.