I have several restive industrial heaters used in our refining process that are going in an addition to our plant, the trouble we are having is these heaters the are all in house engineered and built there is no nameplate and I'm trying to do load calculations for a new transformers to give to our power companies' engineer. We have built everything according to Art. 425 of the NEC I'm just not sure how to classify them according to Art. 220 for my load calculations, thing such as any derates or consideration i need to take in to account
Industrial heaters load calculations
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