The earth is not a good conductor of electricity, so why is grounding still useful?

No question mark needed; the earth is a good conductor

Is the earth a good conductor? Only moist soil has good electrical conductivity; dry soil is not a good conductor!

The understanding is completely correct; soil also has electrical conductivity

The earth contains soil, stones, and other elements; its composition is very complex. Its electrical conductivity is not high, but it has a large volume, which is what matters.

First of all, the earth is a poor conductor； Secondly: Grounding is the most common method of electrical protection, and this grounding is often not the earth itself, but rather the PE conductor ；

The contact area is large, so the surface area of the grounding electrode is quite large!

This post was last edited by blueskyym007 on 2019-5-6 at 17:51. Areas near rivers, seas, and lakes are fine. It is understood that in the Nanjing Jiangbei Chemical Park, a 2.5m grounding electrode is sufficient to achieve a grounding resistance of 1 ohm. The main function of grounding (connecting to the earth) is that the earth provides a 0 potential. This 0 potential is not achieved through zero resistance between conductors; rather, it is made possible by the fact that the earth can supply positive and negative charges indefinitely, thereby enabling current to be generated as a result of charge movement caused by potential differences. Furthermore, there are many means of electrical protection. In terms of personal protection, grounding is one approach, but protection is primarily achieved through equipotential bonding. Specifically, by understanding the formulas in the low-voltage distribution specifications in more detail, it will become clear. The purpose is only one: to reduce the voltage generated in the human body in case of a fault to a level that the body can tolerate. The above is my personal understanding; it’s just for reference.

But in the end, the current still flows into the ground.