Q. What does the Code define as a multiwire branch circuit? A. A multiwire branch circuit consists of two or more ungrounded circuit conductors with a common neutral conductor. There must be a difference of potential (voltage) between the ungrounded conductors and an equal difference of potential (voltage) from each ungrounded conductor to the common neutral conductor [210.4] (see Figure). A multiwire branch circuit can be considered a single circuit or a multiple circuit. To prevent ...

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