Equipotential bonding
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Equipotential bonding ensures that all exposed conductive equipment or components have the same potential in the event of a fault in the grounding protection system. I wonder that when the ground protection fails and the equipment leaks electricity, when a person touches the equipment’s casing, do they immediately touch two points on the casing to ensure that the body is at the same electrical potential?
The resistance of the device itself is very low, so it can be assumed that all points on the device are at the same potential.
Generally, equal potential bonding combines working grounding, protective grounding, and lightning protection grounding together; this helps to prevent phenomena such as backflow during lightning strikes, and it also ensures that the entire grounding system functions as a single unit, thereby contributing to the protection of human safety. To achieve equipotentiality, you immediately touch two points on the device’s casing; only the hands are at the same potential, but what about with respect to the ground? A typical grounding system features repeated grounding. Whether the system uses neutral grounding protection or earth grounding protection depends on factors such as the grounding method of the transformer’s neutral point. Hope this will spark further discussion!
I didn’t understand what the original poster meant. Simply making brief contact with a device that is leaking electricity does not cause an electric shock; a voltage difference at the point of leakage is necessary for current to flow through the body, and that’s when an electric shock occurs!!
Reply to 3# lgj519: The grounding issue seems quite unclear!