Which method is NOT acceptable for identifying an insulated grounded conductor?

Among the methods of identifying an insulated grounded conductor, using green insulation is not acceptable. In electrical wiring standards, green insulation is specifically designated for grounding conductors, not for insulated grounded conductors. This distinction is crucial to ensure that individuals working with electrical systems do not confuse grounding conductors with grounded conductors, which serve different purposes.

Using a label is a widely accepted practice for identifying conductors, allowing clear communication and understanding of the purpose of each wire. This is particularly important in complex electrical systems to prevent accidents or errors during installation, maintenance, or troubleshooting.

Color coding is another standard method for identification. Various colors are designated for different types of conductors, and following these codes helps maintain safety and consistency across electrical installations.

Therefore, while labels and color coding comply with safety standards and practices for identifying conductors, using green insulation for an insulated grounded conductor does not adhere to established electrical code guidelines.