Which of the following is NOT a typical characteristic of grounding conductors?

Grounding conductors are designed to provide a conductive path for electrical current in case of a fault, ensuring safety by reducing the risk of electric shock or fire. One key point is that grounding conductors can be made from various materials, including copper, aluminum, or even steel depending on the application and code requirements. Therefore, stating that they are "always copper" is incorrect.

The other characteristics mentioned are accurate; grounding conductors can be insulated, bare, or covered to protect against environmental factors and ensure proper function. They are required to be continuous and without joint connections to maintain a reliable path for fault current. This ensures that in the case of a fault, electricity can be safely conducted to the ground without interruption or resistance that could pose a safety hazard. This understanding emphasizes the importance of material choice and construction methods in the effective functioning of grounding systems in electrical installations.