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Wednesday, March 15, 2017
Question:
I have a question about outside branch feeders and circuits (art. 225). I work at a large industrial plant and we have several different structures including buildings and equipment skids. My question is concerning the number of supplies to these structures. Section 225.30 states that there can only be one feeder or branch circuit to each structure. Some of the skids have 4160 volt compressors and 480 volt cooling tower fans with 208 volt lights and 120 volt receptacles. If I have 20 of these skids it is not practical to bring 4160 volts to each one and then step it down to these other voltages for each skid. Am I violating the code if I have a one 4160 volt MCC that feeds all of the skids, one 480 volt MCC to feed all of the skids, etc.?
Thanks for your help.
Larry
A
Answer:
Hey Larry thanks for your question. The first sentence of 225.30 requires a single branch circuit or feeder unless more are allowed by 225.30(a) through 225.(E). Additional branch circuits are allowed for different characteristics, such as different voltages, as stated in 225.30(D). Also installations under single management can have additional branch circuits and feeders under the conditions in 225.30(E).