How deep does the static grounding in the workshop need to be buried?

Artificial grounding electrodes have two basic structural forms: vertical burial and horizontal burial. Commonly used vertical grounding elements are steel pipes with a diameter of 50 mm and a length of 2.5 m, or angle steel of type L50×5. To reduce the impact of changes in external temperature on the dissipation resistance, the upper end of the vertical grounding element buried in the ground should be at least 0.7 m above the ground surface. For grounding devices installed in areas with high corrosion, anti-corrosion measures such as hot-dip tin plating or hot-dip galvanizing should be employed depending on the nature of the corrosion, or the cross-sectional area should be increased appropriately. When multiple grounding electrodes are placed close to each other, the dispersion of the current flowing into the ground competes with one another; this effect is known as the shielding effect. This reduces the utilization rate of the grounding system; therefore, the spacing between vertical grounding electrodes should not be less than 5 meters, and the spacing between horizontal grounding electrodes should also not be less than 5 meters. The layout of the grounding grid should aim to ensure a uniform potential distribution across the ground, in order to reduce contact voltage and step voltage. The outer edge of the artificial grounding grid should be closed, and the corners at the outer edge should be made into arcs. Horizontal equalizing strips should be installed within the grounding grid of 35~110kV/6~10kV substations. To reduce the contact voltage of a building, a horizontal distance of not less than 1.5 m should be maintained between the grounding electrode and the building’s foundation; generally, this distance is set at 2 to 3 m.

For details, refer to SH3097 \"Code for Design of Static Grounding in Petrochemical Industries\".

There are **standard ones; you can inquire with static grounding inspection agencies**