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1. The realization of low earthing resistance design in high resistance rate places is emphasized, such as stony soil, gravel, rock and so on.

2. Zero-sequence transient energy is calculated for low earthing resistance and single-phase transient energy for high earthing resistance.

3. The values of earthing resistance of electronic and electrical devices of CATV basic station are the key aspects that will affect the security of devices and persons.

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4. In the high resistivity area, it is very difficult to reduce the earthing resistance to the given value.

5. The measurements of using main steel bars to construct earthing grid in the unattached groundwork and reducing the earthing resistance gratitude in the high resistance rate area were also introduced.

6. Using basic principle of the optimum design, this article maked an approach to the research of earthing resistance in simulated ways.

7. So the loop network-earthing device must be designed in combination with building characters and the earthing resistance can be estimated with a simplified formula.

8. From these aspects, earthing system, protection against electric shock, earthing resistance, residual current protection etc.

9. It presents the calculation method for the actual shielding factor when the terminal earthing resistance is not equal to zero.

10. Therefor by earthing connected net of set , it reduce earthing resistance, make the electricity discharge in earth prompt without dangerous overvoltage.

11. The conclusion that the residence building didn't need to require low earthing resistance was pu.

12. Weak current equipment earthing adopts integrated earthing system with earthing resistance no more than 1 ohm.

13. The different set-up for electronic and electrical devices requires different maximum values of earthing resistance.