For a 3-phase, 4-wire system, how should the branch circuits be identified?

In a 3-phase, 4-wire system, identifying branch circuits is crucial for safety, organization, and efficient troubleshooting. The correct approach is to use a combination of tagging and color coding. This method provides clear visual cues and information about the circuits, which helps in distinguishing between the different phases and neutral wire.

Color coding is typically used to assign specific colors to each phase, making it easier for electricians and service personnel to recognize and understand the system's layout at a glance. Tagging further enhances identification by providing labels that may indicate the purpose of the circuit, its location, or any specific instructions or warnings necessary for safe operation.

This dual approach ensures that anyone working on or with the electrical system can easily identify the correct circuits, understand their properties, and avoid mistakes that could lead to safety hazards or system failures. By employing both visual color cues and clear tagging, the risk of confusion is significantly reduced, fostering a safer working environment and smoother maintenance processes.