Which of the following materials could be used as the grounding electrode conductor (GEC) from the service equipment to building steel?

When selecting a grounding electrode conductor (GEC) from the service equipment to building steel, it's essential to understand the characteristics of the materials that are commonly used. The grounding electrode conductor's primary purpose is to safely carry fault currents and establish grounding connections that protect people and equipment from electrical faults.

All three materials mentioned—aluminum, copper, and bare copper—are acceptable choices for the GEC. Copper is often favored for its conductivity and resistance to corrosion; however, aluminum is also a viable option, especially when adequately sized to handle the fault current and treated to ensure durability. Bare copper, which is a corrosion-resistant option, allows for direct electrical conductivity without insulation, which is particularly beneficial in grounding applications.

By recognizing that each of these materials can effectively perform the function of a grounding electrode conductor, it is clear that utilizing them ensures compliance with applicable codes and safety standards. Having the flexibility to choose among these materials allows electricians to select the most suitable option based on the specific application, installation environment, and other factors, reinforcing the importance of utilizing the correct grounding practices in electrical systems.