Labeling should comply with:

• A. Manuals from unrelated trades.
• B. Electrical codes and standards.
• C. Phone manufacturer guidelines.
• D. No standards.

Answer: (B)

Labeling should follow applicable electrical codes and standards to ensure markings are consistent, legible, and universally understood by electricians and inspectors. The electrical code and recognized standards specify what information must be labeled—such as circuit identification, panel directory, voltage, and hazard warnings—and how those labels should be applied, which keeps installations safe and maintainable. This alignment helps with proper operation, easier servicing, and reliable inspections. Manuals from unrelated trades, phone manufacturer guidelines, or any approach with no standards would not provide the required safety-focused, universally understood markings. Therefore, labeling must comply with electrical codes and standards.