Questions about lightning protection grounding systems
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This post was last edited by sunsunny on 2010-1-10 at 20:39. Is it appropriate to use a single grounding system for the operational grounding of electrical equipment, protective grounding, and lightning protection grounding in engineering grounding systems? Why should the grounding device for protecting against direct lightning strikes be arranged in a circular shape around the building before being connected to the main grounding electrode? Is it feasible to share the lightning protection grounding system with other grounding systems? If so, wouldn’t lightning currents flow into those other systems in case of a lightning strike? How exactly should this be understood? I was wondering if that teacher could provide a detailed explanation. Thank you.
Currently, standards recommend the use of shared grounding electrodes. You need to look it up by yourself. There are too many. I’ll only give you a general idea – in many places, every inch of land is extremely valuable. The building density is very high, and it’s completely impossible to separate various grounds in such a situation. A common grounding electrode is used in conjunction with respective wiring methods, connection approaches, and surge protectors. The effect will be even better!
Do all these require an effective and persistent connection as a basis, or is it recommended to ground them separately?
I think whether to connect them together depends on two factors: 1. Whether the resistance of the grounding device meets the requirements specified in the standards. 2. General considerations for the layout of buildings and equipment that requires lightning protection. As we all know, the purpose of grounding is to direct any unnecessary electrical current into the ground; even in automation design standards, it is permissible to connect the shielding ground with the electrical ground.
The commonly recognized grounding method both domestically and internationally is shared grounding (except for certain special devices that require independent grounding to prevent interference); this approach allows people and equipment to operate at the same potential, thereby avoiding harmful overvoltages for humans or voltage differences that could impair the operation of the equipment.