What must a supply system include if grounded interior wiring is to be connected to it?

For a supply system to effectively function with grounded interior wiring, it is essential to include a corresponding grounded conductor. The grounded conductor serves as a safety mechanism, providing a path for fault currents to safely return to ground, which helps to minimize the risk of electrical shock and fire hazards.

The grounded conductor ensures that the electrical system remains stable during faults by allowing overcurrent protection devices, like circuit breakers, to operate correctly. This is important for maintaining the integrity of the electrical installation and ensuring the safety of users.

It's also important to recognize that while there are other conductors in an electrical system, such as ungrounded and neutral conductors, the grounded conductor specifically fulfills the role of providing a direct connection to ground, which is crucial for protection against electrical faults. Understanding this component is key in electrical installations and safety practices.