A branch circuit, consisting of two or more ungrounded conductors having a potential difference between them and a grounded conductor having equal potential difference between it and each ungrounded conductor of the circuit, and which is connected to the neutral conductor of the system, is ____.

A branch circuit, consisting of two or more ungrounded conductors having a potential difference between them and a grounded conductor having equal potential difference between it and each ungrounded conductor of the circuit, and which is connected to the neutral conductor of the system, is ____.