Article 220.83(A) - Air-Conditioning Loads

[jaggedben]

Let me put it this way:

So really what is the purpose of 220.82 if 220.83(A) will always give you a more liberal result?

220.82 can be used for a yet-to-be built dwelling or service or feeder. 220.83 cannot.

 

[Tainted]

220.82 can be used for a yet-to-be built dwelling or service or feeder. 220.83 cannot.

I know that but what I'm trying to say is that you can use 220.83(A) as a loophole for adding additional loads above the calculated load from 220.82.

 

[ramsy]

I should have punted on this question, and directed you to an IAEI meeting, often hosted by experienced planners, and retired electricians, perhaps familiar with load calc conventions when less polluted with complexity.

 

[Tainted]

I should have punted on this question, and directed you to an IAEI meeting, often hosted by experienced planners, and retired electricians, perhaps familiar with load calc conventions when less polluted with complexity.

There are good arguments on both sides I'd say

 

[tortuga]

I'd be curious to see some side by side comparisons of the two and a 220.87.

 

[Tainted]

I'd be curious to see some side by side comparisons of the two and a 220.87.

I’ve performed load studies some apartment buildings using fluke instruments. I didn’t perform load studies for an entire meter bank but only for the entire building right at the service entrance. The average demand load for a 60 unit apartment building was like around 350 amps. A 120 unit apartment was like 550 amps.

 

[tortuga]

Yeah there you go!
60 units 350 Amps that's what 5 or 6 amps per dwelling unit?

 

[Tainted]

Yeah there you go!
60 units 350 Amps that's what 5 or 6 amps per dwelling unit?

No, the 350 amps is the entire building which includes PLP + residential loads.

 

[jaggedben]

I know that but what I'm trying to say is that you can use 220.83(A) as a loophole for adding additional loads above the calculated load from 220.82.

It's not a loophole. 220.83(A) is a legit way to calculate load for an existing dwelling unit. Just forget that 220.82 exists if you're dealing with an existing dwelling.

 

[tortuga]

No, the 350 amps is the entire building which includes PLP + residential loads.

Whats PLP?
60 Dwelling Units X 5 amps per dwelling unit = 300 Amps

Must not be any electric AC or cooking?

 

[Tainted]

Whats PLP?
60 Dwelling Units X 5 amps per dwelling unit = 300 Amps

Must not be any electric AC or cooking?

Public light and power non residential load in a residential apartment building

 

[tortuga]

Public light and power non residential load in a residential apartment building

Gotchya
Well rest assured 220.83(A) would never come up with 5 amps per dwelling unit.