If you work in the electrical or HVAC industries, you’re probably familiar with Ohm’s law. This important law states that the current flowing through a conductor is directly proportional to the voltage applied to the conductor. In other words, if you increase the voltage, the current will increase as well.
But what does this have to do with electrical earthing?
Well, in order to understand how earthing works, you need to first understand how electrical current flows. Current flows from an area of high voltage to an area of low voltage. So, in order to create a current, you need to have a difference in voltage.
Now, when you connect a conductor to the ground, you create a path of least resistance for the current to flow. The ground is basically a huge conductor that has a very low voltage. So, when you connect a conductor to the ground, the current will flow from the high voltage area to the low voltage area, which is the ground.
This is how earthing works. By connecting a conductor to the ground, you create a path of least resistance for the current to flow, which protects your equipment from damage.