Electrical equipment grounding resistance standard value should not be greater than how much

Standard grounding resistance specification requirements: 1, independent lightning protection grounding resistance should be less than or equal to 10 ohms; 2, independent safety protection grounding resistance should be less than or equal to 4 ohms; 3, independent AC working grounding resistance should be less than or equal to 4 ohms; 4, independent DC working grounding resistance should be less than or equal to 4 ohms; 5, anti-static grounding resistance is generally required to be less than or equal to 100 ohms.6 ***With the grounding body ( Joint grounding) should be no greater than the grounding resistance of 1 ohm.