Final answer:
To form a grounding electrode system, the grounding electrode conductor, the equipment grounding conductor, and any metal enclosures or supports for electrical equipment must be bonded together to create a path to Earth, preventing potential difference and corrosion.
Step-by-step explanation:
The items that are required to be bonded together to form a grounding electrode system include the grounding electrode conductor, the equipment grounding conductor, and any enclosures, frames, or supports that contain or support electrical equipment. These components work together to establish a grounding path to the earth. The goal of this bonding is to ensure that there is no potential difference between these items and the Earth, which facilitates the safe operation of the electrical system.
Additionally, this setup helps prevent corrosion through a process similar to the one used in sacrificial electrodes, where a more active metal is used to protect another metal against corrosion. The safe grounding of electrical systems is crucial for preventing electric shock and ensuring the correct operation of electrical devices.