What is required for a wire to meet NEC standards regarding conductor marking?

To comply with the National Electrical Code (NEC) standards, conductors must display specific markings to ensure safety, clarity, and proper use. The requirement for both voltage rating and size is essential because this information provides critical details about the wire's capacity and the maximum voltage it can safely handle.

Marking the size of the conductor helps users understand its current-carrying capabilities and ensures that it is used in appropriate applications, which is vital for preventing overheating and potential fire hazards. Additionally, indicating the voltage rating gives users explicit information about the maximum voltage the conductor can be safely operated under, which is crucial for installation and usage in various electrical systems.

Thus, the requirement for conductors to be marked with both the voltage rating and size is rooted in creating a safe working environment and facilitating the correct application of electrical conductors in various installations.