For more related videos see these below: Multifamily Standard Crash Course: th-cam.com/video/0Ryf2QlmO-k/w-d-xo.html Multifamily Optional Crash Course: th-cam.com/video/zRKbEu2zNWM/w-d-xo.html Multifamily Standard Deep Dive: th-cam.com/video/laZ4THu15Hs/w-d-xo.html Multifamily Optional Deep Dive: th-cam.com/video/CzIiZwBkNNU/w-d-xo.html
thank you YOU help me a lot finally I passed my administrator exam.Your lessons is essential .I am not just pass the exam but I understand how it is working.
That's awesome! Congratulations! That license really helps put the world at your feet, giving you so many opportunities. I wish you good luck and much success! 👍👍
Thanks for doing the work to put these together! Just a heads up in the 3rd example, the micro/hood was 1400w in the standard method calc instead of 1800w. Also, why is the largest motor not included in optional for triplex? Is that just because it is the optional method? Thanks
Oh no! Thanks for catching that and pointing it out. I see that I accidentally left 1400 in there from a previous template and did the calc off of that instead of the value in the example. Sorry about that! I will correct it, and in the meantime, bring attention to that error. I really appreciate the feedback. After all, accuracy is paramount in a calc! That's right, the optional method does not take into consideration the largest motor extra value.
Hi, Thanks for the videos. I think they are the best. My question. What do you do if you have different type of units in multifamily buildings? For example some appartments 40sq.m, some 90sq.m etc. I practice Canadian Electrical Code but now have a project in Dominican Republic which is under NEC.
That's quite the commute! 😀 If you have a multifamily building with varying unit sizes, it makes it a bit more complicated. And if those units have different appliances or other systems, it makes it even MORE complex. Basically, you have to divide up the units with equal amenities into their own groups, calculate, and then add them back together. The trick is to do the adding at the correct point in the calculation. If you wait until the end before you add them together, you will end up with a larger calculated service size than necessary. For example, if you have a 10-plex with seven 900 sqft units and three 1100 sqft units, you would divide them into two groups and apply each group separately to the first half of column one. You will come up with two building sub-subtotals (50,400VA & 23,400VA). Add them together for an overall subtotal of the building (73,800VA). Then proceed from there as usual with the demand factors. If the individual loads in the units are different, you must use a similar approach with columns two, three, and four, as needed. Hope that helps!
@@canadianelectricaldesignle4026 Yep, it's on the agenda for the next round. That's what's great about all the comments you guys give. It shows me what I left out!😁
Question, when do we apply the 125% to the HAVC calculations. I’ve seen at different times it’s figured in, and other times not. Thanks for your videos.
This is a great question because there is a lot of confusion over this. Please see my One-family Standard Deep Dive video ( th-cam.com/video/MeoYlPm9Djk/w-d-xo.html ) for a fuller explanation, starting around 45:38. But here it is in a nutshell: In the 2020 NEC, they added a sentence at the end of the original text of 220.60. I believe they mistakenly put "125 percent" instead of "25 percent". The way it is worded really makes no sense because, in my video example, we would have to add 100% of the larger of the two noncoincident loads (furnace) AND add 125% of the smaller of the noncoincident loads (heat pump). That is a huge departure from how we have always treated these loads in the past. I think their intent is to reclaim the extra 25% of the largest motor, even though it has been omitted from the calculation (due to being the smaller of the noncoincident loads). They need to word this section more carefully in the future to clarify their intent. Unfortunately, they did not fix it in the 2023 code. In fact, they made it even more confusing, IMO. I wrote to NFPA about this issue, asking that they revise the language. Hopefully, with enough input from folks, they'll make the change. So in my calculations, I treat the noncoincident loads as we always have - omitting the smaller load. However, I include the extra 25% of the smaller load (if it is the largest motor in the building) because I believe that is the intent behind the new sentence. Hope that helps! James
This is a great video but I have a question how do you calculate if 1 apartment is 3 times the size of other? The person turned the basement into 1 apartment 1 bed and floor 1,2,3 made 1 apartment
Hey Shawn, you bring up a great question because the NEC does not give us specific instructions for calculating duplexes or multifamilies that have dissimilar unit features. So we would need to do the following, using the table in the video: In the Lighting column, figure up the Sqft, Small Apps, and Laundry loads for each apartment separately. Then add the results together (instead of multiplying by 2 on line 5). That gives you the subtotal of the building for line 6. Then continue on through the table normally from there on out. Don't forget, if the basement apartment does not have any provisions for laundry, a 1500VA value for a washer is not required in column 1. Hope that helps!
Sorry, I don't have them available for download yet. The best you can do at this point is screen shot it and print it out. I'm working on a fillable calculator, but it will take a little time to complete. I appreciate your patience. :)
For more related videos see these below:
Multifamily Standard Crash Course: th-cam.com/video/0Ryf2QlmO-k/w-d-xo.html
Multifamily Optional Crash Course: th-cam.com/video/zRKbEu2zNWM/w-d-xo.html
Multifamily Standard Deep Dive: th-cam.com/video/laZ4THu15Hs/w-d-xo.html
Multifamily Optional Deep Dive: th-cam.com/video/CzIiZwBkNNU/w-d-xo.html
Thank you very much it is so clear and simple to understand. I love this channel.
Thanks! Happy to hear that!
thank you YOU help me a lot finally I passed my administrator exam.Your lessons is essential .I am not just pass the exam but I understand how it is working.
That's awesome! Congratulations! That license really helps put the world at your feet, giving you so many opportunities. I wish you good luck and much success! 👍👍
Thanks for doing the work to put these together! Just a heads up in the 3rd example, the micro/hood was 1400w in the standard method calc instead of 1800w. Also, why is the largest motor not included in optional for triplex? Is that just because it is the optional method? Thanks
Oh no! Thanks for catching that and pointing it out. I see that I accidentally left 1400 in there from a previous template and did the calc off of that instead of the value in the example. Sorry about that! I will correct it, and in the meantime, bring attention to that error. I really appreciate the feedback. After all, accuracy is paramount in a calc!
That's right, the optional method does not take into consideration the largest motor extra value.
Hi, Thanks for the videos. I think they are the best. My question. What do you do if you have different type of units in multifamily buildings? For example some appartments 40sq.m, some 90sq.m etc. I practice Canadian Electrical Code but now have a project in Dominican Republic which is under NEC.
That's quite the commute! 😀
If you have a multifamily building with varying unit sizes, it makes it a bit more complicated. And if those units have different appliances or other systems, it makes it even MORE complex. Basically, you have to divide up the units with equal amenities into their own groups, calculate, and then add them back together. The trick is to do the adding at the correct point in the calculation. If you wait until the end before you add them together, you will end up with a larger calculated service size than necessary.
For example, if you have a 10-plex with seven 900 sqft units and three 1100 sqft units, you would divide them into two groups and apply each group separately to the first half of column one. You will come up with two building sub-subtotals (50,400VA & 23,400VA). Add them together for an overall subtotal of the building (73,800VA). Then proceed from there as usual with the demand factors.
If the individual loads in the units are different, you must use a similar approach with columns two, three, and four, as needed.
Hope that helps!
Thanks! Would be great to see your videos with this explanation.
@@canadianelectricaldesignle4026 Yep, it's on the agenda for the next round. That's what's great about all the comments you guys give. It shows me what I left out!😁
Question, when do we apply the 125% to the HAVC calculations. I’ve seen at different times it’s figured in, and other times not.
Thanks for your videos.
This is a great question because there is a lot of confusion over this. Please see my One-family Standard Deep Dive video ( th-cam.com/video/MeoYlPm9Djk/w-d-xo.html ) for a fuller explanation, starting around 45:38. But here it is in a nutshell:
In the 2020 NEC, they added a sentence at the end of the original text of 220.60. I believe they mistakenly put "125 percent" instead of "25 percent". The way it is worded really makes no sense because, in my video example, we would have to add 100% of the larger of the two noncoincident loads (furnace) AND add 125% of the smaller of the noncoincident loads (heat pump). That is a huge departure from how we have always treated these loads in the past. I think their intent is to reclaim the extra 25% of the largest motor, even though it has been omitted from the calculation (due to being the smaller of the noncoincident loads). They need to word this section more carefully in the future to clarify their intent. Unfortunately, they did not fix it in the 2023 code. In fact, they made it even more confusing, IMO. I wrote to NFPA about this issue, asking that they revise the language. Hopefully, with enough input from folks, they'll make the change.
So in my calculations, I treat the noncoincident loads as we always have - omitting the smaller load. However, I include the extra 25% of the smaller load (if it is the largest motor in the building) because I believe that is the intent behind the new sentence.
Hope that helps!
James
@@simply.electrical wow, it is really a lot to comprehend. It helps a lot with your explanation. Thanks for your quick reply!
This is a great video but I have a question how do you calculate if 1 apartment is 3 times the size of other? The person turned the basement into 1 apartment 1 bed and floor 1,2,3 made 1 apartment
Hey Shawn, you bring up a great question because the NEC does not give us specific instructions for calculating duplexes or multifamilies that have dissimilar unit features. So we would need to do the following, using the table in the video:
In the Lighting column, figure up the Sqft, Small Apps, and Laundry loads for each apartment separately. Then add the results together (instead of multiplying by 2 on line 5). That gives you the subtotal of the building for line 6. Then continue on through the table normally from there on out.
Don't forget, if the basement apartment does not have any provisions for laundry, a 1500VA value for a washer is not required in column 1.
Hope that helps!
Could i download a copy of your chart?
Sorry, I don't have them available for download yet. The best you can do at this point is screen shot it and print it out.
I'm working on a fillable calculator, but it will take a little time to complete. I appreciate your patience. :)
Very nice!
Thanks! And thanks for checking out my channel!
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Thanks for the 👍! Glad it was helpful to you.
:) ....freedom is not free ✌
Amen!
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