(1) Earthing body: A conductor or group of conductors that are in intimate contact with the earth and form an electrical connection with the earth.
(2) Exposed conductive parts: conductive parts accessible to electrical equipment. It is not charged when it is normal, and may be charged when it is faulty, usually the metal casing of electrical equipment.
(3) Main ground terminal block: A combination of terminals of various grounding (such as working ground, protective ground) and terminals of equipotential bonding wires in a building or part of a building. If arranged in rows, it is called the main ground terminal block.
(4) Protection wire (PE): A conductor that electrically connects any of the exposed conductive parts, the main ground terminal block, the grounding body, and any part of the power grounding point (or artificial grounding point). A conductor that connects a plurality of exposed conductive portions is referred to as a protective trunk.
(5) Grounding wire: Connect the main grounding terminal board or the exposed conductive part directly to the protective line of the grounding body. The grounding wire connecting multiple ground terminal boards is called a grounding trunk.
(6) Equipotential bonding: refers to an electrical connection in which the potentials of the exposed conductive portions and the outer conductive portions of the device are substantially equal.