I really appreciate your time and videos. 220 is soooo freaking difficult because the way it's laid out in the NEC. It's flippin' ridiculous. I'm still fuzzy about much that goes on in 220, but this helps a lot. Thank you.
Great video. I'm planning on taking the test to become a licensed electrician in the near future hopefully. Watching this video was a big help. Thanks for sharing your knowledge with us viewers.
Good refresher, I work for a goldmine company in North easter nv. I like but hate it because the pay and benies are great but for all the actual sizing and brain work the mine contracts the work out so as an electrician we just become parts changers and never really use the math that much. Also MSHA has alot less electrical standards to follow than the NEC, the MSHA standard is probably less than 5 pages. Thank you for this amazing video!
Hello Craig👋! ... I have watched all service Calculations episodes as I have come to the Administrator test. I watched most of your videos when I was taking the EL01 journeyman electrician exam. I passed it with 82%. THANK YOU!! Now, hoping o pass my administrator exam on the first try. Your explanation o beak up the calculation is SO understanding!! I WISH I live in the same city you live in to be your student. I learned a lot from you. AND HANK YOU for speaking very clearly as English is my second language.!! Please, keep up with your GREAT videos! Would like o know more about PLC. I have been doing classic Control for 10+ years. I'm also in processing o reach 40% of learning PLC, HMI, SCADA, Factory I/O, TIA Portal, PC SIMU, CADe SIMU, VFD, and others related to PLC. Again, THANK YOU FOR ALL GREAT VIDEOS!🤗☺🌸🌷👍👌
Thank for the videos they are helping a lot. If you don’t have a compactor, disposal, or any other appliances like that, what do you use for the motor load portion of the calculation?
No, reason being that we are calculating a demand load on the breaker. At the same time there is no continuous load to be concerned with. The Code says nothing about 125% of the breaker for dwellings! CM
Won't some of those loads only be using a single pole breaker on a 120/240v panel so most loads would just be using 120v instead of 240 which would affect the total amperage?
This video is showing how to Calculate the service demand. Yes you have 120v circuits but you must base the load off of the service voltage which is 240v. You will need to know which of those 120v circuits used so that you can size the neutral but I did not go that far in these videos based on I was just showing how to size the service Breaker. CM
I'm a Transportation Elec apprentice and trying to understand for the state exam. lots of practice questions with 120/240 supply voltage. Breaker calculation divides by 240. why not divide by 120?
I guess the main breaker is a 240 volt breaker? I was kinda surprised to see that too... figured that main breaker on the panel was 120, but i guess it is not.
You prolly dont care but does someone know a tool to log back into an Instagram account..? I somehow forgot my password. I would love any tips you can give me.
@Ryder Ahmir thanks for your reply. I found the site through google and I'm trying it out now. I see it takes a while so I will reply here later with my results.
Hi there Craig, I went through the videos to calculate for an ADU 360sqft. single family home and now I'm wondering if I came up with the correct number. My final calculation was 27.27Amps. what would be the breaker size for that?
Hello there, Thank you very much for your video it’s very helpful. Just have one question; After calculating we get 147.25 amps. Which give us 150 amps breakers Let’s assume it’s THHN conductor and for that we got 1/0 from table 310.15.(B)(16) The question since it one phase 3 wire system 2 hot and one neutral are we going to divide the hot on 2 so can we use 2 conductors of size 6 AWG which each carries 75 amps or we use 2 conductors of 1/0 AWG which each carry 170 amps? Or we go to page 800 and choose size 1AWG for both conductors? Hope you got my point.
Great question!! The answer is NO. See the sizing of the wire is based on the load of the overcurrent device. So we are sizing the one leg as stated in the video. Also regardless of the wire type you will always want to use the 75 degree table to size any service over 100 amps. I hope this helps!! Thanks for the question and watching!! CM
I just came across this video so it might be to late for u to notice but have a question on your comment about using the column 75 degrees, I'm assuming that you and this person are talking about sizing the wire in table 310.16. So what about Table 310.12 Single-Phase Dwelling Services and Feeders. Cause this table would make it a #1 awg copper instead of a #1/0. ??
love ur videos! when calculating total VA is the largest motor counted twice? my largest motor is in line10 as a fixed appliance (water heater 28kVA) and again in line14 as largest motor? (7000VA) @25%. thanks.
I would if you could answer this question, I cant seem to find the answer anyware how do you measure the total amps for the entire breaker panel, for 240 devices [like an Dryer] you only measure 1 leg [10a x 240 = 2400 watts] for 120 devices you only measure one leg [hot to neuetral], and then [from my understanding ] the neutral carries the imbalance between the 2 legs, so in other words lets say you have 12 on one leg 15 on the other leg and lets say 3 on the neutral , the question is how do you read this for a true total amps . . i have searched high and low is what is the formula to take these 3 numbers and calcullate the total amps or watts ? if you know the answer id reaaly appreciate it FOR EXAMPLE ; L1 N L2 10A N 10A [240v DEVICE 2400Watt ] 2A N 5A [2 separate 120v devices L1 240 Watt L2 600 Watt ] TOTAL L1 N L2 [neutral carries the difference between the 2 legs from my understanding] 12A 3A 15A Total watts using what we actually know 3,240watts which is 13.5 amp at 240v but if you look at the amps above if you were to measure them it is in no way 13.5A and if you were to measure any of those it would not give you 3240 watts. So how do you actually do it?????? I have looked every where for this answer
Hey craig thanks for posting this, it helped me to remember what I was taught in school👍🏼(it's been awhile lol) also I have a question, is the calculation the same for a commercial location?
Thank you so much for watching my video. As for your question, NO it is not the same. A commercial calculation is a little me involved. I plan on doing some non dwelling calculations in the future. Just not sure of a time frame. Thank you again for watching!! CM
So basically determine the VA From each appliance and divide 240v then you know what system off the service pole will be needed is that correct I have a question determine the calculation and run for a new electrical grid to a 3 story dwelling 😬😬
Craig, thank you for all the information you provide! It has helped me a lot in learning this trade. Quick question on this load calculation... When adding new electrical equipment to an existing home, will these same steps be taken to determine if the panel needs to be upgraded? A little confused since most of the time homes aren't drawing much for amperage, but by calculation on equipment they still need to be upgraded. Example being I'd like to add a Tesla charger to my own home.
@@craigmichaud-electricalins4602 thanks for the clarification Mr Michaud. This video series has been an extremely helpful refresher and I like the way you structured adding up the calculation.👍
Thanks for the video. I can't get a straight answer on this, hopefully you can help settle an argument... If you have a 200 amp residential main service panel and you get a reading of 105 amps on each of the main 120v feeders, are you drawing 210 amps, therefore the 200 amp panel is overloaded? Or is it only drawing 105 amps total?
Please don't take this as an insult or anything but... Shouldnt that main feeder breaker be at a minimum (125%) of the total load. Which would come to roughly 187. My inspectors would fail me if I had any breaker under 200 amps. At least that's what I was taught when I got my license. You're going to make someone have an electrical fire. You may want to remake this video brother.
This is also my understanding. I was hoping to get a definite answer from UA-cam about this but most videos are not multiplying the load by 1.25. So I’m still confused.
I really appreciate your time and videos. 220 is soooo freaking difficult because the way it's laid out in the NEC. It's flippin' ridiculous. I'm still fuzzy about much that goes on in 220, but this helps a lot. Thank you.
I really appreciate your video! Thank you for making them, your channel is important to a whole generation of new electricians!
Great video. I'm planning on taking the test to become a licensed electrician in the near future hopefully. Watching this video was a big help.
Thanks for sharing your knowledge with us viewers.
Good refresher, I work for a goldmine company in North easter nv. I like but hate it because the pay and benies are great but for all the actual sizing and brain work the mine contracts the work out so as an electrician we just become parts changers and never really use the math that much. Also MSHA has alot less electrical standards to follow than the NEC, the MSHA standard is probably less than 5 pages. Thank you for this amazing video!
Thanks, Craig your videos are definitely helpful. This got me to a good understanding of Load Calculation.
Hello Craig👋! ... I have watched all service Calculations episodes as I have come to the Administrator test. I watched most of your videos when I was taking the EL01 journeyman electrician exam. I passed it with 82%. THANK YOU!! Now, hoping o pass my administrator exam on the first try. Your explanation o beak up the calculation is SO understanding!! I WISH I live in the same city you live in to be your student. I learned a lot from you. AND HANK YOU for speaking very clearly as English is my second language.!! Please, keep up with your GREAT videos!
Would like o know more about PLC. I have been doing classic Control for 10+ years. I'm also in processing o reach 40% of learning PLC, HMI, SCADA, Factory I/O, TIA Portal, PC SIMU, CADe SIMU, VFD, and others related to PLC.
Again, THANK YOU FOR ALL GREAT VIDEOS!🤗☺🌸🌷👍👌
I’ve enjoyed watching your calculations videos. I’ve learned a lot from them thank you.
Thank You Craig A1 videos . You break it down without all the riff riff.
Great Teacher with great knowledge
How would you determine if you want to use a 80% rated or 100% rated breaker in this example?
Divide by .8
Thank for the videos they are helping a lot. If you don’t have a compactor, disposal, or any other appliances like that, what do you use for the motor load portion of the calculation?
I think the size of the breaker should be 125% higher than the full load current , isn't it ?
That could be in the case of continuous load (a load sustain more than three hours)
No, reason being that we are calculating a demand load on the breaker. At the same time there is no continuous load to be concerned with. The Code says nothing about 125% of the breaker for dwellings! CM
What an awesome guy. Thank you for the info provided.
Thank you, I understand the amps much better.
thanks for the explanation...so clear great video
Awesome video you helped me
Great Information, thank you for teaching it in a comprehensible way
Thank you for the videos sir much appreciated
Won't some of those loads only be using a single pole breaker on a 120/240v panel so most loads would just be using 120v instead of 240 which would affect the total amperage?
This video is showing how to Calculate the service demand. Yes you have 120v circuits but you must base the load off of the service voltage which is 240v. You will need to know which of those 120v circuits used so that you can size the neutral but I did not go that far in these videos based on I was just showing how to size the service Breaker. CM
Thanks for the information. Question - what would be the correct way to calculate the load for a workshop in a detached garage?
For the dishwasher, what do you do when it is measured in watts instead of amps?
Nothing its all ready to be calculated!!! CM
1w = 1va
you are awesome Craig thanks
I'm a Transportation Elec apprentice and trying to understand for the state exam. lots of practice questions with 120/240 supply voltage. Breaker calculation divides by 240. why not divide by 120?
I guess the main breaker is a 240 volt breaker? I was kinda surprised to see that too... figured that main breaker on the panel was 120, but i guess it is not.
What about if I wanna add a 100 amp sub panel??? Do i just add that 100 amps to my main panel??
Craig to you have a video for calculating rv parks
I thought for the feeder you always round down the breaker size?
@@terrytripp4545 that only applies over 800 amps. CM
Thanks for your great videos..
I enjoyed it and learned a lot thanks 🙏 I’m building a workshop and will use this method to find out what sub panel I need 👍
You prolly dont care but does someone know a tool to log back into an Instagram account..?
I somehow forgot my password. I would love any tips you can give me.
@Desmond Samuel Instablaster :)
@Ryder Ahmir thanks for your reply. I found the site through google and I'm trying it out now.
I see it takes a while so I will reply here later with my results.
@Ryder Ahmir it worked and I actually got access to my account again. I am so happy:D
Thanks so much you saved my ass!
@Desmond Samuel No problem =)
Thanks man. Very easy to follow
Thanks for sharing such value information , god bless you ! Is the same process for a mobile home ?
Great stuff man, very helpful 👍
Craig, do you have a printable sheet for this?
Hi there Craig, I went through the videos to calculate for an ADU 360sqft. single family home and now I'm wondering if I came up with the correct number. My final calculation was 27.27Amps. what would be the breaker size for that?
I'm trying to do the same thing, get the load calculation for my 500sqft ADU. Did you do it yourself of hire an electrician?
Thanks Craig, how to calculate when you have three phases in the panel
Thanks sir. I appreciate it for your videos.
Sir, Craig awesome video,,.
Hello there,
Thank you very much for your video it’s very helpful.
Just have one question;
After calculating we get 147.25 amps. Which give us 150 amps breakers
Let’s assume it’s THHN conductor and for that we got 1/0 from table 310.15.(B)(16)
The question since it one phase 3 wire system 2 hot and one neutral are we going to divide the hot on 2 so can we use 2 conductors of size 6 AWG which each carries 75 amps or we use 2 conductors of 1/0 AWG which each carry 170 amps?
Or we go to page 800 and choose size 1AWG for both conductors?
Hope you got my point.
Great question!! The answer is NO. See the sizing of the wire is based on the load of the overcurrent device. So we are sizing the one leg as stated in the video. Also regardless of the wire type you will always want to use the 75 degree table to size any service over 100 amps. I hope this helps!! Thanks for the question and watching!! CM
I just came across this video so it might be to late for u to notice but have a question on your comment about using the column 75 degrees, I'm assuming that you and this person are talking about sizing the wire in table 310.16. So what about Table 310.12 Single-Phase Dwelling Services and Feeders. Cause this table would make it a #1 awg copper instead of a #1/0. ??
love ur videos! when calculating total VA is the largest motor counted twice? my largest motor is in line10 as a fixed appliance (water heater 28kVA) and again in line14 as largest motor? (7000VA) @25%. thanks.
What about the 80% breaker size rule? 80% of 150 amps is 120amps so would you want to upsize to 175amps instead? Would leave 140 amps then
how to do transfer all those loads to kW to put on the load letter?
I would if you could answer this question, I cant seem to find the answer anyware
how do you measure the total amps for the entire breaker panel, for 240 devices [like an Dryer] you only measure 1 leg [10a x 240 = 2400 watts] for 120 devices you only measure one leg [hot to neuetral], and then [from my understanding ] the neutral carries the imbalance between the 2 legs, so in other words lets say you have 12 on one leg 15 on the other leg and lets say 3 on the neutral , the question is how do you read this for a true total amps . . i have searched high and low is what is the formula to take these 3 numbers and calcullate the total amps or watts ? if you know the answer
id reaaly appreciate it
FOR EXAMPLE ;
L1 N L2
10A N 10A [240v DEVICE 2400Watt ]
2A N 5A [2 separate 120v devices L1 240 Watt L2 600 Watt ]
TOTAL
L1 N L2
[neutral carries the difference between the 2 legs from my understanding]
12A 3A 15A
Total watts using what we actually know 3,240watts which is 13.5 amp at 240v but if you look at the amps above if you were to measure them it is in no way 13.5A and if you were to measure any of those it would not give you 3240 watts. So how do you actually do it?????? I have looked every where for this answer
Why do you divide be 240 V instead of 120 V? When the majority of applications are on the latter, thanks.
Because your main service coming in is 240v
Hey craig thanks for posting this, it helped me to remember what I was taught in school👍🏼(it's been awhile lol) also I have a question, is the calculation the same for a commercial location?
Thank you so much for watching my video. As for your question, NO it is not the same. A commercial calculation is a little me involved. I plan on doing some non dwelling calculations in the future. Just not sure of a time frame. Thank you again for watching!! CM
Thanks for the video
Can you do Commercial Load calculations?
I am working on them as we speak. I hope to have them out in the next month!! CM
Thank you 👍
can you multiply the final number by .83? 310.15(b)(7)??
Thanks you so much ❤️💪👍
Thank you your a big help
Ok, how do I convert the sum to KW?
So basically determine the VA From each appliance and divide 240v then you know what system off the service pole will be needed is that correct
I have a question determine the calculation and run for a new electrical grid to a 3 story dwelling 😬😬
Craig, thank you for all the information you provide! It has helped me a lot in learning this trade. Quick question on this load calculation...
When adding new electrical equipment to an existing home, will these same steps be taken to determine if the panel needs to be upgraded? A little confused since most of the time homes aren't drawing much for amperage, but by calculation on equipment they still need to be upgraded.
Example being I'd like to add a Tesla charger to my own home.
What about the 83% in a dwelling? I have no idea what "method" this is, so I may be wrong
Can someone explain why the compactor is the largest motor please?
Thank you for this
These videos help
I really appreciiate de video but I need you help to fill the load shedule sheet am never fill before and im forget so please ley me know tks
Can’t you do 35% of the remaining load after 100% of the first 3000 volt amps?
That’s all in my first video General Lighting Load. This video is completing a dwelling calculation!! CM
@@craigmichaud-electricalins4602 thanks for the clarification Mr Michaud. This video series has been an extremely helpful refresher and I like the way you structured adding up the calculation.👍
awesome!!!!! simple
Thank you!
Thanks for the video. I can't get a straight answer on this, hopefully you can help settle an argument... If you have a 200 amp residential main service panel and you get a reading of 105 amps on each of the main 120v feeders, are you drawing 210 amps, therefore the 200 amp panel is overloaded? Or is it only drawing 105 amps total?
I can't imagine you're drawing 210amps. Wouldn't you're main breaker have already tripped? This is very rare with no short condition.
105 amps total. Amperage stays the same.
Thankyou sir :)
Thank you
Please don't take this as an insult or anything but... Shouldnt that main feeder breaker be at a minimum (125%) of the total load. Which would come to roughly 187. My inspectors would fail me if I had any breaker under 200 amps. At least that's what I was taught when I got my license. You're going to make someone have an electrical fire. You may want to remake this video brother.
That only applies for commercial buildings, if it's residential you can actually downsize to 80%
This is also my understanding. I was hoping to get a definite answer from UA-cam about this but most videos are not multiplying the load by 1.25. So I’m still confused.
Big help
I never saw such a simple subject made so difficult and frustrating.
Thank you
thank you