dwelling calculation

[alpinemike]

Dwelling Calculation. Is it necessary to figure in the load of a refrigerator and seperate freezer in the general method?How about a microhood? If there are 4 or more fixed appliances and 2 of those are 40gal water heaters,they can each be derated 25%,correct? Thanks

 

[dillon3c]

Re: dwelling calculation

Originally posted by alpinemike:
Dwelling Calculation. Is it necessary to figure in the load of a refrigerator and seperate freezer in the general method?How about a microhood? If there are 4 or more fixed appliances and 2 of those are 40gal water heaters,they can each be derated 25%,correct? Thanks

05'NEC *standard calculation dwelling unit(s)
220.52 Small Appliance and Laundry Loads-Dwelling Unit
220.52(A) Exception: The individual branch circuit permitted by 210.52(B(1),Exception#2 shall be permitted to be excluded from the calculation required by 220.52

*your refrigerator & separate freeze,(permitted to omit from calculation)

220.53 Appliance Load-Dwelling Unit(s)
It shall be permissible to apply a demand factor of 75%percent to the nameplate rating load of four or more appliances fastened in place,other than electric ranges,clothes dryers,space heating equipment,or air-conditioning,that are served by the same feeder or service in a one-family,two family,or multifamily dwelling.

*Your (2)two waterheaters,and your fixed microwave permitted to be included in the demand factor of 75%percent,of(4)four or more appliances.

[ September 13, 2005, 05:46 AM: Message edited by: dillon3c ]

 

[alpinemike]

Re: dwelling calculation

Thanks dillon3c, I thought it was in there somewhere.