220.88(C) says "the largest of the following six selections" meaning you could loose the heat if it is smaller than the AC.
Roger
New Restaurant calculations help
- Thread starter Cory@MAHC
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Roger
Cory@MAHC
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There is no 220.88(C). 220.82(C) says this but that applies to Dwelling Units, which I would say a New Restaurant is not.
BTW, you are correct about it being Dwelling Units, I was replying to Jumpers post.
Roger
jumper
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Jumper is confused. What did I get wrong? Wrong code reference?
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- Chapel Hill, NC
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- Retired Electrical Contractor
I can't understand why you all think you need to use both the a/c load and the heat load. They won't be on at the same time
jumper
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Because of the footnote in the table.
Note: Add all electrical loads, including both heating and cooling loads, to calculate the total connected load. Select the one demand factor that applies from the table, then multiply the total connected load by this single demand factor.
You cannnot double dip on the demand factors here. If it was a standard calc I would do that, but the optional method seems to disallow it.
You didn't, I somehow read 220.82 as being 220.88, a fleeting moment of dyslexia.
Roger
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- Chapel Hill, NC
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- Retired Electrical Contractor
You may be correct but it makes no sense to add the heating and cooling unless it is a heat pump that comes on with the heat strips. If that is the case then perhaps mike holt has it incorrect.
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- Chapel Hill, NC
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I sent an email to mike. Hopefully he will respond when he gets a chance
mike@mikeholt.com
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220.88 New Restaurants.
220.88 New Restaurants.
Guy, when you use a rule, you use it as written, includint tables and notes to table. The note to Table 220.88 is as follows: "Note: Add all electrical loads, including both heating and cooling loads, to calculate the total connected load. Select the one demand factor that applies from the table, then multiply the total connected load by this single demand factor." So when you are using Section 220.88 and apply Table 220.88, we then apply note to Table 220.88. Yes, we do include a/c and heat. It doesn't have to make sense, we just have to follow the specific rule. Section 220.61 is contained in Part III of Article 220, it does not apply to any rule contained in Part IV.
220.88 New Restaurants.
Guy, when you use a rule, you use it as written, includint tables and notes to table. The note to Table 220.88 is as follows: "Note: Add all electrical loads, including both heating and cooling loads, to calculate the total connected load. Select the one demand factor that applies from the table, then multiply the total connected load by this single demand factor." So when you are using Section 220.88 and apply Table 220.88, we then apply note to Table 220.88. Yes, we do include a/c and heat. It doesn't have to make sense, we just have to follow the specific rule. Section 220.61 is contained in Part III of Article 220, it does not apply to any rule contained in Part IV.
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- Chapel Hill, NC
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- Retired Electrical Contractor
The problem is the numbers don't come out to match any of the answers given
jumper
Senior Member
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- 3 Hr 2 Min from Winged Horses
Make one of answers 432A instead of 402A works when I ran the numbers.
- Location
- Chapel Hill, NC
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- Retired Electrical Contractor
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Mike agrees there is an error in the answers. The correct answer should be 441 amps based on 8000 va for lighting-- no 125% should be added to this. Add all the other stuff and you get 105,850 va
105850/240 = 441 amps
There is a note that he wrote that says to see annex D example D3 for continuous loads
The answer for 26 is 656 amps
105850/240 = 441 amps
There is a note that he wrote that says to see annex D example D3 for continuous loads
The answer for 26 is 656 amps
jumper
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- 3 Hr 2 Min from Winged Horses
Thank you. So just a minor typo. It happens.
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