3. Grounding resistance is the resistance when the current flows from the grounding device into earth, then through another grounding body or the resistant that encountered when spread to distant. It includes the resistance between the ground wire and the grounding body, the contact resistant between the grounding body and the earth and the earth resistance between two ground bodies or the earth resistance between the grounding body and infinity. The grounding resistance directly reflects the contact degree between electrical device and earth, also reflects the grounding grid scale.
4. Leakage current is the current through its surrounding medium or insulation surface between the metal parts in electrical equipment.
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