The independent lightning protection grounding resistance shall be less than or equal to 10 ohms; the independent safety protection grounding resistance shall be less than or equal to 4 ohms; the independent AC working grounding resistance shall be less than or equal to 4 ohms; the independent DC working grounding resistance shall be less than or equal to 4 ohms; the anti electrostatic grounding resistance shall be less than or equal to 100 ohms generally. The common grounding body (joint grounding) shall not be greater than 1 ohm of the grounding resistance.
中性点接地电阻柜接地可以分三种：
There are three types of neutral grounding resistance cabinet grounding:
1. 保护接地：电气设备的金属外壳，混凝土、电杆等，由于绝缘损坏有可能带电，为了防止这种情况危及人身安全而设的接地。2. 防静电接地：防止静电危险影响而将易燃油、天然气贮藏罐和管道、电子设备等的接地。 3. 防雷接地：为了将雷电引入地下，将防雷设备(避雷针等)的接地端与大地相连，以消除雷电过电压对电气设备、人身财产的危害的接地，也称过电压保护接地。
1. Protective grounding: the metal shell of electrical equipment, concrete, pole, etc. may be electrified due to the insulation damage, and the grounding is set to prevent this situation from endangering personal safety. 2. Anti static grounding: prevent the grounding of fuel oil, natural gas storage tank, pipeline, electronic equipment, etc. due to the influence of static electricity. 3. Lightning protection grounding: in order to introduce lightning into the underground, connect the grounding terminal of lightning protection equipment (lightning rod, etc.) with the earth to eliminate the damage of lightning overvoltage to electrical equipment and personal property, also known as overvoltage protection grounding.
