What size grounded conductors can be identified by distinctive white or gray markings at their terminations?

The identification of grounded conductors through distinctive white or gray markings at their terminations aligns with the National Electrical Code (NEC) standards. These markings are used to clearly differentiate grounded conductors, which are typically neutral conductors in a wiring system.

When it comes to the sizes of grounded conductors, the NEC specifies that specific sizes must be used for various applications, especially for certain voltage levels and in residential or commercial installations. For the choice identified, 4 AWG conductors, which are often used for larger circuits in both residential and commercial settings, are generally permitted to be marked with white or gray to indicate that they are grounded conductors.

This marking practice is crucial for ensuring safety and compliance during installation, maintenance, and troubleshooting, providing immediate visual identification to electricians and technicians. Therefore, the size that adheres to these distinctive markings at terminations is indeed 4 AWG.