Where is the neutral wire connected in a three-wire system?

In a three-wire system, the neutral wire serves a crucial function by providing a return path for current to the source. It is typically connected to the service panel ground connection. This connection is essential for safety, as it helps to equalize voltage levels and provides a path for fault currents, which can help prevent electrical shock or fire hazards.

The service panel is where power from the main supply is distributed to various circuits within a building. By connecting the neutral wire at the service panel ground connection, it ensures that any excess current can be safely directed back to the ground, maintaining system stability and protecting users. This grounding connection also provides a reference point for other circuit potentials, ensuring that the electrical system operates safely and effectively.

While other options may relate to components of the electrical system, they do not describe the correct function or placement of the neutral wire in a three-wire system. The neutral's primary role is to connect at the service panel to maintain safety and efficacy in circuit operation.