Application of Table 220.44

[kgunter]

Hi All,
I have a question concerning the application of table 220.44 to receptacle loads in Offices and banks. As you guys know 220.44 says,
Receptacle loads calculated in accordance with 220.14(H) and (I) shall be permitted to be made subject to the demand factors given in Table 220.42 or Table 220.44.
This seems to indicate that only receptacle loads calculated in H and I can use the demand factors on table 220.44. However in Tom Henrys 2008 calculations book he shows a bank calculation in which he applies the demand factors of Table 220.44 to the receptacle load. Since section 220.14(K) says,
In banks or office buildings, the receptacle loads shall be calculated to be the larger of (1) or (2)
(1) the calculated load from 220.14(I)
(2) or 1 volt-ampere/ft2
It would appear that if the receptacle load exceeds this minimum standard of being greater than the square footage of the bank or office you would have to take it at full value since 220.44 does not specify (K), but now I?m unsure. It may be worth noting that in Tom Henry?s example even after applying the demands of 220.44 the receptacle load still exceeded the minimum standard of (K).


Thanks
Kial Gunter

 

[bphgravity]

Any questions you have referring to a Tom Henry product should be directed to Tom Henry or one of the staff at his bookstore. Give them a call to discuss your question.

 

[kgunter]

Hey Bryan,
I didn't really think this was a question about a "Tom Henry product", and I believe I know what he thinks. I brought this up at a code class I'm taking and it generated a large amount of disagreement but no resolution. My instructor suggested I post the question on this forum, and bring back the responses next week.

Thanks for all your help.

 

[ivsenroute]

My interpretation is that if this is for a bank or office building then you have a choice between:

1) The computed load from 220.14 which allows Table 220.44

or

2) 1VA per Ft2 which does not allow Table 220.44 to come into play

Whichever works out to be the larger load of the two choices.

The Table 220.42 is not relevant because it would be 100% for this application anyway.

My example would be a proposed 20,000 sq ft bank with 130 planned duplex receptacles.

130x180=23,400
10,000 + (50% of 13,400)=16,700

20,000 sq ft x 1vA sq'=20,000

The square footage calculation would have to be used since it is larger.

 

[Bjenks]

Mike Holt seems to only apply the demand to the 180VA x # of receptacles too. However, 220.14(K) is a very simple statement: In banks or office buildings, the receptacle loads shall be calculated to be the larger of (1) or (2):
(1) the calculated load from 220.14(I)
(2) 1 VA/sq ft.

Demand is never mentioned or implied.

220.44 is also a very simple statement: Receptacle loads calculated in accordance with 220.14(H) and (I) shall be permitted to be made subject to the demand factors given in 220.42 or 220.44.

This tells me ANY receptacle calculation done in 220.14(H) or (I) can be subject to table 220.44

220.14 (I) to me says to use 180VA per outlet unless you are subject to 220.14(K) then use that. Again it never mentions the demand.

So I believe it is popular to use the demand on the 180VA only. However, I believe the way it is written is to :
1) Use 220.14(K) see which one is larger by multipling 180 x # of receptacles versus 1 va/Sqft. the answer of 220.14(k) is then the result of 220.14(I) which gives me permission to use 220.44. Thus even the 1 VA/sqft is subject to the demand of 220.44 if it is larger than the number of receptacles x 180VA.

Seems clear to me, but it gets confusing when you see experts do it differently.