Which of the following is NOT part of typical grounding electrodes?

Grounding electrodes are critical components of an electrical system designed to ensure safety by providing a path for fault currents to safely dissipate into the ground. Typical grounding electrodes include materials that can effectively conduct electricity and provide a reliable connection to the earth.

Ground plates, steel framing, and ground rings are all conductive materials that can serve as grounding electrodes. Ground plates are flat metal plates buried underground to achieve a low-resistance connection to the earth. Steel framing of a building can serve as an effective grounding electrode when properly bonded to the electrical system. Ground rings are continuous loops of conductive material buried around the perimeter of a structure to provide a good grounding point.

In contrast, plastic pipes do not have the necessary conductive properties to serve as grounding electrodes. They are insulators and do not connect electrically to the earth, which is why they cannot fulfill the role of grounding electrodes in an electrical system. Thus, while the other options consist of conductive grounding materials, plastic pipes are not suitable for grounding applications.