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Electric Boiler Demand Factor

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JDD120

Member
Location
Colorado
Occupation
Engineer
Question: Should large electric boilers be considered a general load or a heating load for service size calculations?

The way that I interpret the code right now is that section 220.82 allows you to take the boiler load at the demand factor for general loads of 100% for the first 10kVA and at 40% for the rest of the loads. Does having a 40% demand factor on a large restrictive electrical element that can have a large peak usage make sense? Im not to familiar with the heating cycle of these boilers, but it feels wrong to have say a 100A boiler have a 40% demand factor.
 

tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
Question: Should large electric boilers be considered a general load or a heating load for service size calculations?

The way that I interpret the code right now is that section 220.82 allows you to take the boiler load at the demand factor for general loads of 100% for the first 10kVA and at 40% for the rest of the loads. Does having a 40% demand factor on a large restrictive electrical element that can have a large peak usage make sense? Im not to familiar with the heating cycle of these boilers, but it feels wrong to have say a 100A boiler have a 40% demand factor.
I'd classify a boiler for hydronic heating under 220.82(C)(6)
 
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