Meter sockets supplied by an electric utility are not required to be what according to the NEC?

The understanding that meter sockets supplied by an electric utility are not required to be listed according to the NEC comes from the nature of these components and their purposes within the electrical system. Listed equipment generally must meet certain safety standards as determined by recognized testing laboratories, ensuring they are suitable for the conditions and applications for which they are intended.

Meter sockets, when provided directly by the utility company, don't fall under the requirement for listing because they are deemed to be part of the utility's infrastructure. This means they are installed and maintained by the utility, which assumes responsibility for their construction and safety. Since the utility provides these sockets, they don't require the same level of scrutiny or certification that other electrical equipment might require when purchased by contractors or homeowners.

In contrast, the other aspects mentioned in the choices—inspections, grounding, or marking—are subject to NEC requirements to ensure safety and proper function. Inspections are vital for ensuring that the installation is safe and meets local codes. Grounding is essential for safety under the NEC, protecting against faults and ensuring proper operation of the electrical system. Marking is also necessary for various components to ensure that they are identifiable and properly documented for maintenance and safety purposes.

Thus, understanding the unique role of utility-supplied meter