Non-continuos Load Resistance Heater Calculations
- Thread starter zabawire
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brother
Senior Member
Aren't all fixed electric space heating equipment considered continuos loads regardless of anything else so long its the branch circuit 125%?? NEC 2008 424.3(B) Feeders are 220.51 at a 100%, not 125%
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Volta
Senior Member
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- Columbus, Ohio
Sure, but there can be resistance heaters that are not space heating equipment. Like a pvc hot box, or an iron, or a cooktop.
240 volt non-continuous loads . . . Either current from the nameplate, or ohms law for amperage. Section 310.15 will help you choose the right conductor.
Welcome to the forum.
I think there's an exception that allows the AHJ to allow a load of less than 100% for intermittent heating. You'd need to have some calculations to justify the reduced load and then try to convince an AHJ to allow it. It just might be easiest to figure 100% load.
brother
Senior Member
Ok, I see your point. But the o.p. didn't specify what type of 'resistance' heater this is. What is it used for? If its a cooktop, theres a specific way to do that, if its something else then you right it would be ohms law the way to go.
I saw the word heater and figured he/she was heating space.
Hope they come back to clarify.- Status