Topic: 220.53
User: charlie b, Location: Lockport, IL
Asked on: Monday, March 21, 2011 at 7:04 pm EDT
Answered on: Tuesday, May 14, 2024 at 3:04 am EDT
Question: In the intended context of the "75% demand factor for four or more appliances fastened in place," do any of the following meet the definition of appliance (i.e., can we include them in the 75% DF)?Range hood fan.Bathroom exhaust fan.Garage door opener.If the largest motor happens to be one of the four or more appliances, do we get to apply the 75% demand factor to the 25% factor that we have to add for the largest motor?Regarding item 1, I can't think of a reason why not. But it just seems wrong to me.Regarding item 2, I think not, but I can't see a clear answer in the code language.
- Range hood fan
Yes, a range hood fan is considered an appliance under the NEC. It is a fixed appliance that is used to remove cooking vapors and odors from the kitchen.2.
Bathroom exhaust fan
Yes, a bathroom exhaust fan is also considered an appliance under the NEC. It is a fixed appliance that is used to remove moisture and odors from the bathroom.3.
Garage door opener: No, a garage door opener is not considered an appliance under the NEC. It is a device that is used to open and close a garage door.Regarding your second question, if the largest motor happens to be one of the four or more appliances, you can apply the 75% demand factor to the 25% factor that you have to add for the largest motor. The NEC states that "the demand factor for four or more fixed appliances fastened in place shall be 75% of the nameplate ratings." This means that you can reduce the total load by 25% when calculating the total load for the circuit.
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