The standard of anti-static grounding resistance is not fixed, but differentiated according to specific requirements. According to the national standard, in general, anti-static grounding resistance should be controlled within 10 ohms, but if the equipotential connection, the ideal value can be as low as 4 ohms, or even 1 ohm. The ideal low resistance value means lower induced potential and faster current dissipation. This upper limit of 10 ohms is more of a recommended standard, and in practice, the smaller the resistance the better the results.
There are various methods for measuring antistatic grounding resistance, including the hand-operated ground resistance meter method, clamp-type ground resistance meter method, voltage and current meter method, three-pole method and four-pole method. The choice of these methods depends on the specific circumstances of the measuring equipment and cloth pole.
In the building lightning protection design specification, for lightning protection against induction, different categories of buildings have different requirements. A class of lightning protection building, lightning induction grounding device should be with the electrical equipment grounding device *** enjoy, its industrial frequency grounding resistance should not be greater than 10 ohms. And for the second category of lightning protection building, each lead wire grounding resistance, although the minimum requirement of 10 ohms, but it is recommended with lightning induction, electrical equipment, etc. *** enjoy the grounding system, in order to improve efficiency.
In general, the qualified standard of anti-static grounding resistance needs to be judged in conjunction with specific scenarios and specifications, and is generally recommended to be below 10 ohms, especially for equipotential connections, the lower the better. In implementation, appropriate measurement methods should be selected and relevant specifications followed.