What type of conductor must be identified in a multiwire branch circuit?

In a multiwire branch circuit, it is essential to identify ungrounded conductors. This is because multiwire branch circuits typically consist of two or more ungrounded conductors that share a common neutral. Identifying these ungrounded conductors is crucial for safety and proper system operation. This identification helps prevent overloading of the neutral and ensures that circuits are correctly disconnected during maintenance, which reduces risks of electrical shock or fire.

Grounded conductors and neutral conductors also play significant roles in electrical systems, but the specific focus on ungrounded conductors in the context of multiwire branch circuits highlights the need for clear identification to manage the balance of load across the phases of the system effectively. Proper identification assists in ensuring that the circuit functions correctly and safely, adhering to the guidelines set forth in the National Electrical Code.