Dig a 2m angle steel and galvanize it for 2-3m as grounding body, and drive it into the hole.
Copper wire of not less than 2.5 mm is connected to the angle iron.
The test grounding resistance should be less than 4 ohms.
Note: The neutral wire and the ground wire should be separated.
That's how I dig houses. Supplement: When digging a pit, it is best to sprinkle a little coarse salt at the bottom of the pit to improve the effect!
In fact, if it is a high-rise building, it can generally be directly tied to the tap water pipe with a line of 1.5 square meters (note that it must be a metal pipe, not a plastic pipe! ), you can get good results!
Extended data
The function of grounding wire
1, protect personal safety
Because electrostatic discharge is easy to produce a large amount of charge, if the electrical equipment is not properly isolated, it will easily cause great harm to the electrical equipment itself and human body, and the role of grounding wire is just as a conductor between high-voltage equipment and the earth to prevent us from being hurt by charge.
2. Lightning protection law
In the past, when it rained and thundered, telephone poles and other equipment were often damaged by lightning, and sometimes they could not be used for several days. Therefore, the role of grounding wire can play a good role in lightning protection and effectively prolong the service life of electrical equipment.
3. Ensure normal operation.
For some jobs that need electricity, such as medical work, the role of grounding wire is to avoid sudden power failure, which will not be affected and can still work normally.