Label information should typically include:

• A. Voltage level only.
• B. The label color.
• C. Date of inspection only.
• D. Circuit designation and voltage.

Answer: (D)

Proper panel labeling must show which circuit each breaker controls and the system’s voltage. This combination is essential because it lets anyone working on the panel quickly identify what each breaker feeds (the circuit designation) and the electrical potential present (the voltage). With both pieces of information, you can safely shut off the correct circuit during maintenance or an emergency, verify device compatibility, and ensure compliance with standards that require clear circuit mapping and voltage ratings. Labels that show only the voltage miss the circuit map, labels that show only a color or a date of inspection don’t provide the practical guidance needed for safe operation, and a label with just the voltage level still leaves the circuits unidentified.