The grounding resistance refers to the resistance encountered when the current flows from the grounding device to the ground and then flows through the ground to another grounding body or spreads to a distance. It includes the resistance between the grounding wire and the grounding body itself, the contact resistance between the grounding body and the ground, and the resistance between the two grounding bodies or the ground resistance from the grounding body to an infinite distance. The size of the grounding resistance directly reflects the good degree of contact between the electrical device and the "ground", and also reflects the scale of the grounding network. Under conditions such as single point grounding system and strong interference, measurement can be carried out by using auxiliary grounding electrodes. The grounding resistance is mainly divided into the following three types:
1. Protective grounding: The metal casing of electrical equipment, concrete, poles, etc., may be charged due to insulation damage. To prevent this situation from endangering personal safety, grounding is designed 2. Anti static grounding: To prevent the hazardous effects of static electricity from grounding flammable fuel, natural gas storage tanks, pipelines, electronic equipment, etc
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