All homes must be earthed to ensure optimum protection of equipment and installations. This socket is particularly useful in the event of a voltage drop, for example, but also to protect residents from the risk of electric shock or electrocution.
When installing the socket, some masters will pay attention to the neutral wire and the live wire, and often ignore the ground wire. Some workers even say that the grounding wire is not necessary for leakage protection.
If your home is decorated in the same way as the workers, not only do not give him a penny, he must also be compensated! Why listen to me slowly tell you below.
What is a ground wire?
The ground wire is the abbreviation of the grounding device, which is connected to the earth, the shell, or the wire with a zero reference potential in the electric system or electronic equipment.
What is the role of the ground wire?
In general electrical appliances, the ground wire is connected to the shell to prevent electric shock accidents caused by the electrical appliances due to the internal insulation destroying the shell. The ground wire is divided into working grounding and safety grounding. The protective grounding used to prevent electric shock accidents when people use home appliances and office electronic equipment is a kind of safety grounding wire.
Why is a ground wire necessary?
Many people think that the ground wire can be saved if the leakage protector is installed. If the electrical appliances in the home are used for a long time, the leakage switch may frequently trip, and no one can guarantee that the leakage protector will never leak. In the event of danger, it will be you who will be injured.
The ground wire can connect the shells and frames of electrical equipment that are not charged under normal conditions and may be charged under fault conditions to the earth through the ground. Its function is to make a good metal connection between the uncharged metal part of the electrical equipment and the grounding body, reduce the voltage of the contact to the ground, and avoid the risk of electric shock to the human body.
Principle of grounding and role in domestic electrical installation
Commonly known also under the name of “earth connection”, the earthing consists in evacuating the leakage current in the event of an insulation fault on an electrical device towards the earth, via a copper conductive wire, and therefore to protect people from the risk of electric shock or even electrocution.
In other words, when your home is equipped with earth, the electric current which escapes goes directly into the ground via the earth, and the power supply is cut off for safety thanks to the differential protection device. If this is not the case, as can happen if there is an insulation fault on an electrical device, it remains on its metal frame until it can escape: when you touch a metal part of the device, you act as the earth ground and the current passes through you to earth, which can cause in particular a potentially fatal heart failure.
How to make a good grounding? 3 professional methods
Ideally carried out during the construction of the house, earthing is nevertheless possible during renovation, although more complicated to implement.
There are 3 solutions:
The excavation bottom loop suitable for new construction: this technique consists of a loop (bare copper braid of 25 mm² section) starting and returning to the electrical distribution panel around the house in the foundations, thus ensuring the connection earth on the terminal.
The conductor in the supply trench: the earth cable leaves from the earth terminal on the electrical panel and reaches a remote point at the appropriate distance, buried at a depth of one meter (it must not be placed less than 20 cm from a water, gas or electricity pipe)
The installation of one or more galvanized steel earth rods (solution for the renovation): each earth rod is planted vertically in the ground at a minimum depth of 2 meters, surrounded by a conduction filing, and connected to the earth bar on the switchboard via a copper braid with a section of 25 mm²; an inspection window and anti-corrosion protection are placed on the connection.
In this Article, I told how Ground Wire is helpful for the security of a home.
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