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How does the NEC specify that the high leg of a four wire delta connection be marked?

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter21: Special-purpose Outlets—food Waste Disposer, Dishwasher

Section21.1: Food Waste Disposer Circuit

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How does the NEC specify that the high leg of a four wire delta connection be marked?

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