Multifamily Optional Service Calculation - Deep Dive 2020
HTML-код
- Опубликовано: 7 окт 2024
- This video shows a detailed, step-by-step approach to an electrical service calculation. The use of a handy table format makes it easy to understand and implement into real-world applications, and likewise is very useful for study and exam prep.
See my channel for more videos:
/ @simply.electrical
See my website for more info:
howtofixit.net...
Electrical, NEC, Exam, Test, Load, 2020, Table, Feeder, Master, Journeyman, Apprentice, Electrician, Calc, Calculation, Service
![Mariah Carey - We Belong Together [American Music Awards 50th Anniversary Special]](http://i.ytimg.com/vi/UnO2m2BEXDU/mqdefault.jpg)
Thanks for watching today's video! Please let me know what you thought about it. And let me know what else you'd like to see a video about!
Stay free!
you are the best lesson that I could find on internet
Thanks! I really appreciate the feedback.
Not a load Question but maybe you can help with this?
I can’t find a definitive answer to this question do you have any thoughts?
CAN I RUN 300 VOLT COMMUNICATIONS WIRE IN THE SAME ENCLOSURE AS CLASS 1 600V CIRCUITS IF I HAVE A BARRIER RATED FOR 600V?
I don't know your exact scenario, but check out 805.133(A)(1) & (2). And pay close attention to the exceptions. Hope that helps!
thank you for your time i appreciate it very much@@simply.electrical
Why did you take the largest heating or cooling at 100% and not 40%?
See 220.84(C)(5). We are given no demand factor or percentage for this load, so it must be taken at it's full rating. The 40% option only applies to Single Family Optional calcs [220.82(C)(5)], and only if there are four or more separately controlled units.
interesting stuff
Thanks, glad you like it.
Did you ever make the video on house loads?
No, I haven't, simply because there is no universal way to treat them. House loads are generally done according to Part III of Article 220 (see 220.84(B)). Typically, you would just use the commercial calc table (ruclips.net/video/1tQAf7lw-Uw/видео.html) for your house loads, and then add them to your multifamily calc. But this may change from jurisdiction to jurisdiction. Some municipalities may treat house loads as commercial, and some as part of the multifamily. You will have to check to be sure in your area.
In my area, we treated large house loads as commercial in most cases. Little quad-plexes and such that might have a tiny house panel for site lighting and common area lighting would just be included with the multifamily calc. Maybe other folks here can chime in with their experiences.
If I were taking a test, I would go with the commercial route, since that's generally accepted as the codebook answer.
@@simply.electrical does including it with the multifamily calc mean just counting the 3x VA/sq. Ft then the appliances/ motors at nameplate with no additional things like SABCs/laundry
@@86aoshi I'm only talking about the very small multifamily buildings that have a tiny house panel with a few common area lights, etc. on it. In those cases, we just treat it like it's part of one of the units. It's such a negligible amount, it really doesn't affect the total to any significant degree.
However, if it is a larger house load panel (with perhaps laundry facilities, workout room, pool, etc.), I would treat that panel as a commercial calc, and then add the result to the "House Loads" part of the table in this multifamily calc. Hope that helps!
Do you have take 70% of the final amps? After 200 amps?
No, you do not have to take 70% for your ungrounded feeder sizing.
Perhaps you're talking about calculating the neutral load in 220.61(B)? If so, be sure to look closely at the provisions for that section.
Do you have take 70% of the final amps?
No, you do not have to take 70% for your ungrounded feeder sizing.
Perhaps you're talking about calculating the neutral load in 220.61(B)? If so, be sure to look closely at the provisions for that section.
Great video. When doing the optional method like you did in this calculation the calculated load for the Dryer is 4600KW. Why wasn't it calculated at 5KW? is the minimum 5KW (or nameplate greater than 5KW) only used when doing the standard method? thanks.
I'm confused when you're suppose to use the Standard and when you are suppose to use Optional method.
for optional method you must us the nameplate rating as stated in 220.82 (B)(3)
@@mcarroll598 in the exam, it will ask specifically ask for optional method calculations. otherwise, it will always be standard method. again, the question will ask you that you use the optional method.
@@pablovalles3622 thanks.
@@pablovalles3622 Thanks Pablo for filling in for me while I was gone!👍