Which of the following conductors must be installed in the same raceway for a 120/208-volt multiwire branch circuit?

In a 120/208-volt multiwire branch circuit, all conductors—phase conductors, grounded conductors (neutrals), and equipment bonding conductors—must be installed in the same raceway to ensure proper operation and safety of the electrical system.

Using phase conductors together in the same raceway is essential for the circuit to function at the intended voltage. In a multiwire branch circuit, this configuration allows the use of two-phase conductors, which contribute to the creation of the required voltage.

Grounded conductors, which are typically the neutral wires, must also be installed in the same raceway. This is crucial for maintaining a shared return path for the current flowing from various circuit loads, thus ensuring safe operation without potential electrical imbalances or hazards.

Additionally, equipment bonding conductors, which are essential for grounding purposes and safety, must be included in the same raceway for the proper bonding and grounding of all equipment connected to the circuit. This harmonizes the grounding system and minimizes the risk of electrical shock.

Integrating all these conductors in the same raceway helps maintain a balanced and effective circuit, strengthens the overall safety of the system, and complies with the National Electrical Code (NEC) requirements regarding multi