- Видео 33
- Просмотров 20 767
Jarod V Electric
Добавлен 16 мар 2022
In depth explanations of Electrical Theory.
Commercial Load Calculations Pt 1, Introduction.
This is an intro into understanding Commercial Load Calc. Here we will go through an 8 step process inspired by Electrical 101's video titled, "NEC Commercial Load Calculations" This will get you familiar with where these rules are in the NEC code book. Feel free to ask me questions, or make comments on the video. Thanks for watching!
Просмотров: 365
Видео
Multifamily Load Calculation (Standard) Pt 5
Просмотров 3736 месяцев назад
Learn about Multifamily Load Calculation using the Standard Method. Then I go over a question and fill it in with you.
Duplex Load Calculation (Optional) Pt 7
Просмотров 2236 месяцев назад
Make sure to first watch my video on multifamily load calculation using the optional method (Pt 6) This will ensure that this video is a lot less confusing.
Multifamily Load Calculation (Optional) Pt 6
Просмотров 1586 месяцев назад
Before we move on to optional method load calculation for duplex we must first understand multifamily using the optional method. This will make learning about duplex using the optional method a lot less confusing.
Load Calculation Magic # Pt 8
Просмотров 1256 месяцев назад
Learn about a consistent Magic # that you can use to easily find the General Lighting Load portion of your load calculations that go over 120,000 sqft va. This only applies to the standard method.
Duplex Load Calculation (Standard) Pt 4
Просмотров 3776 месяцев назад
Learn how to complete Duplex Load Calculations with the Standard Method using the NEC. I will first go over a page layout and a summary of the rules, then I will give you an example and solve it with you. I make sure to explain lots of things, repeat things and make things very clear so you are not confused. Let me know how you liked the video and enjoy!
Residential Load Calc Pt 3
Просмотров 1376 месяцев назад
A summary and comparison of the Standard Method and the Optional Method for Load Calculation for Single Family Dwelling Units. This will get us ready for moving on to duplex and multifamily for both the standard as well as optional method. Get ready for Commercial Load Calc vids after this!
Residential Load Calculations Pt 2
Просмотров 8297 месяцев назад
This is the second part to my Residential Load Calculations video. This goes over a rule that will apply for Single Family, Duplex (Two Family), and Multi-Family Dwellings. This is 25% of the Largest Motor that is then added one time no matter how many Dwellings you have. Which I explain in this video. There will also be future videos for Duplex and Multi-Family which will include this rule in ...
NEC Chapters & More
Просмотров 3808 месяцев назад
In this video I go over the NEC 2020 Edition and discuss important key topics found in each chapter. Ch. 9 Videoruclips.net/video/DHrhQAsLga4/видео.html Sizing Pull Boxes:ruclips.net/video/raJksPKDeJc/видео.html
Optional Method Load Calculation Pt 1.5
Просмотров 8458 месяцев назад
Residential Load Calculations:ruclips.net/video/er07gUB1l7g/видео.html Sizing Junction Boxes:ruclips.net/video/WHiXxc4_zyA/видео.html Box Fill:ruclips.net/video/61Gd0Otu8fE/видео.html Ch. 9 Overview:ruclips.net/video/DHrhQAsLga4/видео.html
Residential Load Calculations Pt 1
Просмотров 4,8 тыс.9 месяцев назад
Questions in this video are from the Electrical Code Coach's RUclips Channel.
Box Fill
Просмотров 1999 месяцев назад
Learn how to fill Boxes with conductors using the NEC code book.
Sizing Junction Boxes
Просмотров 1489 месяцев назад
Learn how to size Junction Boxes using the NEC code book.
Gutter & Wireway Fill
Просмотров 8889 месяцев назад
Learn how to fill Wireway & Gutter with conductors using the NEC code book.
Conduit Fill
Просмотров 779 месяцев назад
Learn how to quantify the amount of conductors that will fit in a conduit. Make sure to check out the Chapter 9 video if you are not familiar with Chapter 9. (below) Ch9 Video:ruclips.net/video/DHrhQAsLga4/видео.html&t Sizing Conduit:ruclips.net/video/g7f8r4nuXMY/видео.html
How to Change the Subject of a Formula
Просмотров 6410 месяцев назад
How to Change the Subject of a Formula
Transformer Turns Ratio Calculations
Просмотров 1,6 тыс.Год назад
Transformer Turns Ratio Calculations
Jarod, I would like to have a worksheet like yours as it looks like it would make my life much easier when calculating in an orderly fashion. Thanks in advance. I will be watching your other videos. I like the way you take the time to go in detail. That is important in the electrical business.
Woooooow thank you very much young man... God bless
Happy to help!
Thanks Jarod, excellent mathematical, and clear step by step
I'm glad you like it. Thanks for the feedback!
Hi ,Iam confused! 25% oof 1100va is 275va that gives us the total of 3,980va
Watch the video I explain it.
Thank you Jerry. So much help . I would like to have your e-mail please.
javujo@gmail.com
Hey Jarod how does gas appliances affect load calculations?
Great question! Gas powered appliances still need an outlet to ignite the flame and help the electronics in the appliance work, this is known as the "power for supplemental equipment and lighting." Check out Article 210.52 (B) (2) Exception 2. This exception tells us that we can add an extra outlet to provide power for the "supplemental equipment and lighting" on gas ranges as well as gas ovens and counter-mounted cooking units. Notice that this is found in section (B) of Article 210.52. Section (B) is Small Appliances (Small Appliance Branch Circuit ... SABC) this means that this extra outlet can be added on one of the SABCs. In conclusion you do not need to add any additional load for a gas powered appliance. The circumstance where you might end up adding additional load for a gas powered appliance is if someone mentions they want it on a dedicated circuit. Since it is located in the kitchen the plugs will need to be on the SABC meaning you would count another SABC at 1500va. You might see this in real life with a customer.
So how many number 12 thhns can I fit in a 12"x12" gutter 40 feet long.
That example was just to introduce the concept. There is a reason why I did not solve that question all of the way like I did with the other ones. But to answer your question: You could fit 2,165 #12 THHN conductors in a 12" x 12" gutter, again 40ft is irrelevant in this calculation since we are using square inches. (All explained in the video)
@@jarodvelectric7431 yes but the 40 feet shouldn't be irrelevant. A lot of these codes are dumb and don't really make sense as to why they were the way they are. You should definitely be able to fit more wires in a 40 foot long gutter compared to a 2 foot long gutter.
@@jimbush1581 Yeah the code book does not always make sense logically. They way I look at it is like a law, it may not make sense but it is the rule.
This was NOT SIMPLE
Neither is music! But as you continue it becomes less of a "foreign language" and you begin to connect the dots. You got this!!
Hey Jarod you said in the video that you've been doing this for a while now. Do you do this for work? Because I recently began learning load calculations. And I really enjoy doing them, and I am curious about what types of jobs would have to perform L.C. as a primary responsibility. I appreciate any insight and thanks for the video!
30:57
Yes I have been studying this for over 6 years and have years of experience on the job as well. That is a great question and I am glad you enjoy doing these because that should benefit you in life. Are you an electrician? As an electrical contractor you will need to be able to solve these to get licensed and also to know how to do your job. There could be positions where you solely do load calc but I have never heard of them ... I'm guessing the best chance at finding a position like that would be for the union. However it is good to know positions like that would usually not be for the new employees but instead reserved for those with lots of experience and years with the company.
Passed my load calcs for my Admin @ 90% because of your videos! Thank you
@Brandom84 Good job! You also passed because you studied and took it seriously. I'm really glad my videos helped!! And thank you for the feedback.
It might help to take the answer and use it to size the OCPD and conductors at the end. I am not sure but I think the total load would be 117.66 amps; this would require a 125 amp service OCPD with copper #2 sized from T310.12(A). Do you agree with these numbers?
Yes, it would be 118A as amps get rounded up if 0.5 or higher, according to Article 220.5 (B). Yes correct, 125A Service OCPD with #2 cu. or 1/0 al.
Thank you for your video. Very informative. Question. When we’re calculating the (AC) why after multiplying 18 x 240. Why didn’t have to multiply by 125% that’s what’s getting me confused.
@@yasserabisaipineda9700 125% is for commercial load calculations, not residential.
Great video,, keep doing more
@@JesusCruz-wt2zp Thanks!!
Thank you so much for your videos. They’ve been a huge help. I’ve taken the 02 admin for Washington state twice now and both times I failed the load calcs by two questions. What’s confusing to me is on some of the questions they say NOT to include any house or laundry loads… Does this mean when I’m doing my GLL I only add the 3000va for the SABC and exclude the 1500va for laundry?
Never mind. You explained it in the next video! Lol.
Yeah that whole thing is ridiculous, I think it is a cheap question. I'm glad you saw the explanation in my other video, I hope you pass the next time!!
@@jarodvelectric7431 thank you! After watching your playlist on residential load calcs, it helped me understand much better. I’m feeling pretty confident now. Also you’re spot on about some of these “practice tests” and “study guides”. I appreciate you man.
Hey I have questions about the largest motor… When comparing heat vs a/c… if heat is bigger and we omit the a/c then do we have to go to the next largest motor below that in appliances? OR even though we omitted the a/c… do we still use that to get our 25% of largest motor? Thanks!
No you do not use the AC in the 25% load calculation. You choose the next largest motor below that. Even Mike Holt teaches this. Read this: forums.mikeholt.com/threads/selecting-largest-motor.2440/ read the comment by "txinspect"
@@jarodvelectric7431 thank you! Second question (and I’ll probably ask you a lot more now that I have found you as a resource) when doing dwelling calculations (single or multi family) am I ever going to calculate heating or cooling as a CONTINUOUS LOAD and multiply them at 125%?
@markjohnsonkeys Yeah no prob! Ask away! No, continuous load demand factors are only when you get into commercial load calculations.
Do you apply 83 percent rule after you have done standard or optional method? Or is that already applied in table 310.12, 100-400 amps.
@@wakeandbakw it is already applied in T310.12
13:17 I do not understand how you got 32,800 VA as your total VA.
This is just an example. These are separate examples to break down each section of the calculation into separate sections. The point is to show you if you had 32,800 VA, what you would do with it in the optional method. At 15:17 there is an actual example which includes everything all at once.
Thanks
If you run 4 twenty amp circuits into a kitchen, do you need to use 3000VA or 6000VA in the small appliance calculation? If you have 2 twenty amp circuits run to double vanity in the bathroom, do you need to increase your small appliance calculation?
Four 20A kitchen circuits would be 6,000 va. Kitchen circuits = small appliance branch circuits. They are 1500va each, with 2 minimum. So if you are not told how many you have it is a minimum of two at 1500va each. Since you have four then there are four at 1500va each. No, small appliances are only related to the kitchen. The way to do load calculations is taught in my videos and I never mention bathrooms because that is not a part of the load calculation. To understand this more read this: forums.mikeholt.com/threads/bathroom-circuit-added-to-load-calculation.24798/ And make sure to check out my newer load calc vids!
If you run 4 twenty amp circuits into a kitchen, do you need to use 3000VA or 6000VA in the small appliance calculation?
Q) If we know the total VA of general light and receptacle, can we know exactly how many lights and outlets are there in that dwelling unit? A) The exact amount would not be known but there are minimums. Such as a minimum number of branch circuits on General Lighting using #14 AWG or #12 AWG. You would figure this out by getting your sqft multiplied by 3va. Then From this number dividing it by 120v then divide that by the amps you are working with, 15a or 20a. This will tell you how many branch circuits you have with this portion plus an additional FOUR 20-amp Branch Circuits for: 2 SABC, 1 Laundry Circuit, and 1 Bathroom circuit. For example: if you had a 2,500 sqft dwelling then you would first do 2,500 x 3 = 7,500 from here you divide by 120. 7,500 / 120 = 62.5 from here you divide by the amps you are working with, first I will do 15A for #14 AWG. 62.5 / 15 = 4.166 You always round up to the NEXT whole number. So even though you normally would not round up 4.166 in this case you always round up to the next whole number. 4.166 becomes 5. This means you need 5 Branch Circuits for this 2,500 sqft dwelling plus an additional FOUR 20-amp Branch Circuits as explained above. This is a complicated area because they might ask how many general purpose branch circuits you would need... this means instead of the additional 4 you would only count the 5 for the lighting portion. If you had 20A for #12 AWG then you would divide accordingly: 62.5 / 20 = 3.125 again round up to the NEXT whole number Now you can have 4 General Purpose Branch Circuits for this 2,500 sqft dwelling and if you are doing the entire General Lighting Load you should know the additional FOUR 20-amp branch circuits explained above.
My last comment was incorrect I thought you just typed "appliance circuit" the small appliance calc would be 6,000va with four 20A kitchen circuits.
Great follow along
Thanks!
Thank you for your work
You can explain cm
That is true but it is not common that you will have to figure out that number on your own without using this formula to solve for CM. To find CM (Circular mils) in the codebook go to Chapter 9 Table 8. In the first column you will see Area, and below it is Circular mils that correlates to each wire gauge to the left.
Great content young man. Mahalo
Thank you!
How are you, have a couple questions what’s your email address?
transformer turns ratio is about input and output voltages. in fact input and output coils should be calculated for input and output power. for example a 230VAC 50hz transformer must have a primary coil with 230/50*6.28 henries of of inductance for consuming currents lower than 1Amps. its reactance should be 230ohms. transformer core and its cross section area is the most important parameters for transformers. the transformer core and cross section area must be calculated well. otherwise transformer will burn soon.
Great comment, thanks!
My brother you are doing a great job 👏. Thank you keep up the great work
Thank you, I appreciate that!!
Te agradesco mucho tienes mucho conocimiento.. You are amazing!!!
Gracias por el comentario. Muy apreciado. :)
sir do you have a pullbox calculation on your list?
ruclips.net/video/raJksPKDeJc/видео.htmlsi=j72WXC396lnOUGo5 here is a video I made on my other channel before I created this channel.
But I see you already commented on that video. I could make a new video as I do have some good info on it.
@@jarodvelectric7431 did i sir? i can't remember. i'll just look into your channel. thanks anyway
Hey bro! I just wanted to say THANK YOU!!! You are an awesome teacher, way better than some other “teachers” from RUclips… I watched your 8 videos about Load Calculations and passed my Master Electrician Exam on my first try today!! The page layout, the tips, the magic # and the way you explained everything made me confident. Thanks again!🙏🙏
Thank you!! I am really glad you passed, and first try is pretty rare so good job on that! Thanks for the feedback it means a lot. 😃
what edition are you using sir?
Thanks for the comment. I am using the 2020 Edition. I forgot to mention that in this video, I will remember to next time!
Maybe the mouse has an automatic garage port and lights up when it's in use (26:50 )
what if it's 3 phase?
Then instead of 2 K I L / CM ... it is the square root of three in place of 2. √3 K I L / CM
Square root of three is something you will often see used in 3 phased systems. The number used is 1.73 or a step further 1.732.
Do you have an UGLYs book? It has all the formulas in it
sir what is the K value for Al?
copper is 12.9, aluminum is 21.2
I should have used 12.9 for copper in this video because that is what you do in real life.
@@jarodvelectric7431 that's more correct because more people are watching sir so you must pay attention on the correct information so as not to mislead the beginner. thanks for the correction
@@manuellastrollo2168 Yeah I agree but it was non intentional. The reason I used 12 is because I went to school for this and they taught me the number was 12. This is why it is always good to double check what you are being taught to make sure it is correct.
You're doing an amazing work, brother. Great explanation, and the attention to details is at another level. Thank you so much!!
That is very kind of you, thank you!!
You are doing great job.Hope to see more video..
Thank you, I really appreciate that! I am editing some videos on the Optional Method right now :)
Good job. The electrical industry needs as much help as possible when it comes to electrical theory. I harvest as many Electrician videos as possible so I can learn. Good job here. I would suggest doing a couple videos on Clarifying the difference between grounding and equipment grounding conductors. Many people still think that electricity wants to go to ground; which it doesn’t. Many still think a ground rod is for safety, which it isn’t.
Thanks for the feedback! Yeah it is normally difficult finding specific videos for electrical theory so that is what I am trying to offer here. That is a great suggestion/idea! I definitely am proficient on the whole grounding/bonding topic and will put that on my bucket list for videos to make in the future. I will furthermore make an entire video on the equipment grounding conductor and another video for the grounding electrode conductor. Unless it is a misconception, it is common knowledge that the ground rod can be helpful when lighting strikes ones house to help the current go into the ground. But in terms of safety in the house I would think of GFCI protection.
@@jarodvelectric7431 By safety, I meant, the electrode doesn’t help with clearing a fault current. Most non-union guys I’ve worked with simply believe that “ground” means the same thing in all contexts; ground rod, grounding, grounded, EGC, ground fault. To be fair, it’s the fault of the pedagogy of the NEC and the vernacular that the industry uses which causes people to be confused. Other things guys are getting wrong are conduit fill, derating, load calc & voltage drop. I’d suggest creating a downloadable pdf worksheet for each of these scenarios you cover (create a website that you can later monetize) specifically the calculations. Mike Holt’s calculation course costs $500! That’s a shit ton of money. Plenty of room for you to cover ground and sell eHandbooks and test questions. I’ve been thinking of doing the same for some time now, complete with “how to” videos, but I’m nowhere near qualified yet. Good luck. I subbed.
And AFCI! ^^
good job
Thank you so much for all of the support as well as positive comments!! I am planning some videos about Load Calc for Duplex and Multifamily for both the Standard Method and also the Optional Method. They should all be out by the end of the month
Yes I’m looking forward to your new videos. Let’s Do It
As always you did a a great job! TY
Thank you once again!
Currently studying for my (02) Electrical administrator license in Washington State and your videos have helped a ton! I have my exam this month on the 27th.
Good luck! Make sure to have your 2020 UGLYs book because that will have formulas in it you can use on the test! Also, pick up a key term index for your RCW/WAC if you do not already have that it will help you a ton!
Hey man just wanted to let you know that I passed my administrators exam all due to your videos. You explain things so much easier than any other of the big names here on RUclips. God bless man .
@user-zx8zt4pw3e That makes me really happy to hear that. I would have not made this channel if I felt like the big names taught well enough. So for you to tell me this means a lot! Thanks for sharing this with me. :)
This is crap
It is hard to work with someone with remarks like that... I have a newer video if you are trying to learn. ruclips.net/video/er07gUB1l7g/видео.html&t
@@jarodvelectric7431 you’ll never get to a 200 amp panel at 1200’ home.
@@MarioLopez-iv2nw The point is not the answer it is how you got there... You must be very difficult in real life.
@@MarioLopez-iv2nw Go make your own video then buddy.
Good morning from Houston ,Texas I wake up and practice with your videos and lessons. Thank you and well explained J!
I am glad that you are getting use out of these! That makes me really happy to hear. If you do not already have it, make sure to pick up a copy of your version of UGLYs! It has mostly all of formulas I teach in my videos.
Remember to still include 25% of your largest motor when you are done with everything! No matter how many units you have you will only count it one time. For example in this video the largest motor is from the garbage disposal which is 900 VA .... then 900 VA x .25 = 225 W . This means along with what I taught in the video you will add 225 W. This means the ending number: 33,705 + 225 = 33,930 W ... This is your answer for total VA. 25% L.M. vid: ruclips.net/video/XqFcmxB4UlE/видео.html&t Summary and Comparison of Standard and Optional Method: ruclips.net/video/AqMjHHDS7Kw/видео.html
Awesome video
Thanks! Remember to include 25% of your largest motor when you are done with all of this. Check the pinned comment for a more in depth explanation plus I will be uploading a video on it soon on my channel so look out for that.
you are helping out so much by breaking it down ! thank you
Glad to help! Remember to include 25% of your largest motor when you are done with all of this. Check the pinned comment for a more in depth explanation plus I will be uploading a video on it soon on my channel so look out for that.
ERRATUM: 33:58 Sizing wire from OCPD, there is no need to multiply by 1.25. Furthermore I should have not used Table 310.16 because I need to math in the 83% rule for Residential Load Calc. This is already calculated for you in Table 310.12. So in this circumatance with 179.94 which gave us the 200 Amp OCPD (T240.6 (A)) we would then go into table 310.12 and find 200 amps and then match it with the correct wire size. In this senario 200 amps (T310.12) will give us: 2/0 cu. and 4/0 al. As you can see from the header of Table 310.12, it is for Services and also Feeders. The wires from the load side of the service attatching to the main breaker (OCPD) would be considered feeders. I will redo this portion of the video in a new video where I can explain it better. I cannot provide a copy of the worksheet. But it is more of a burden than a help, here is my newer video on Residential Load Calc that explains a method that relies on the book which is more accurate to a testing scenario. (Vid Below) ruclips.net/video/er07gUB1l7g/видео.html&t Optional Method Video: ruclips.net/video/qjgStSt4xJo/видео.html&t
Hey! I would like a copy of your worksheet please. Great video btw, thank you!
I cannot provide a copy of the worksheet. But it is more of a burden than a help, here is my newer video on Residential Load Calc that explains a method that relies on the book which is more accurate to a testing scenario. (Vid Below) Residential Load Calc:ruclips.net/video/er07gUB1l7g/видео.html&t Optional Method Video: ruclips.net/video/qjgStSt4xJo/видео.html&t
Great Work! Do you have a worksheet / video for the Optional Method?
Thanks! Yes it is one of my most recent videos, here is the link:ruclips.net/video/qjgStSt4xJo/видео.html&t Also, I have a newer video on the standard method where I show the process without a worksheet, which is more realistic to the actual test so I highly recommend that video too. It is called Residential Load Calculations, here is the link:ruclips.net/video/er07gUB1l7g/видео.html
Thanks in advance...
Yes! And good luck!