What is required when installing multi-wire branch circuits to ensure safety?

When installing multi-wire branch circuits, it is essential to have separate breakers for each phase to ensure safety. Multi-wire branch circuits typically involve two or more hot conductors that share a common neutral. However, to prevent overloading the neutral conductor and ensure proper disconnection in the event of an issue, each hot conductor must be connected to its own circuit breaker. This arrangement ensures that if one circuit is turned off, the other circuits remain powered, thus minimizing the risk of overloading the neutral and preventing potential electrical hazards.

Having separate breakers is also crucial for system coordination and the ability to isolate circuits for maintenance or troubleshooting without affecting other circuits. It enhances the overall safety and functionality of the electrical system.

In contrast, while shared neutral conductors are part of the multi-wire system, their proper use is contingent on the circuit breakers being configured correctly to avoid overload conditions. Common grounding is also important in ensuring electrical safety, but it does not address the specific requirements for operating multi-wire branch circuits safely. Identical wire sizes can be a consideration for compatibility and safety, but they do not directly relate to the requirement for guarding against overload situations in multi-wire configurations.