In multiwire branch circuits, what conductor's continuity shall not depend on the device connections?

In multiwire branch circuits, the continuity of the grounded conductor, often referred to as the neutral conductor, must be maintained irrespective of the connectivity of the devices in the circuit. This requirement is crucial because the grounded conductor serves as the return path for electrical current and is essential for the safe operation of the circuit.

If the continuity of the grounded conductor depended on the connections of individual devices, it could lead to unsafe conditions. For example, if a device were to be disconnected or fail, and that disconnection interrupted the return path of the current through the grounded conductor, it could create an open circuit condition. This could result in unexpected voltage levels on connected devices, increasing the risk of electric shock or equipment damage.

Thus, the design and installation of multiwire branch circuits ensure that the grounded conductor's continuity is independent of the device connections, maintaining safety and functionality in the electrical system.