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How to understand the basic knowledge of grounding

02-09-2020

Grounding is an electrical safety measure taken grounding rod to enable electrical equipment to work normally and protect personal safety. Generally, grounding is achieved by linking a metal wire with a grounding device.

The main function of grounding equipment is to provide grounding protection for power supply lines and electrical equipment of homes or buildings. It can introduce leakage current, static charge and lightning current generated on electrical equipment into the ground to avoid personal electric shock, fire, explosion and other accidents.

There are two main types of grounding equipment commonly used for grounding, namely, protective grounding (grounding of household electrical equipment or power supply lines).

Protective grounding is a necessary grounding measure in the family. The most common household grounding equipment is the grounding wire and grounding rod. The grounding wire is-the metal wire is widely used to transmit leakage current and static charge. Ground rods, also known as grounding electrodes or grounding grids, are mainly used to introduce the leakage current, static charge or lightning current from the grounding wire into the ground.

When houses and buildings need grounding protection, after connecting the power ground wires in the house together, insert them into the ground to a certain depth with a ground rod with good conductivity. The depth should be determined according to the amount of current in the house as a whole, and the grounding wire and the grounding rod should be connected together.

Most household appliances that people use daily need to be grounded. In household appliances, if grounding protection is not used, when a part of the insulation is damaged or a phase line touches the metal shell, the metal shell of the household appliance will be charged. If the human body touches the metal shell of the appliance at this time, there will be a risk of electric shock. The field must be grounded, and the electrical outlet must be connected to the ground.