When we renovate our home's electrical circuit, if we observe carefully, we should have noticed that there are three wires connected to the socket, namely one live wire, one neutral wire, and one ground wire. However, some friends do not know how large this ground wire should be. As the friend asked now: The live and zero wires of the socket are both 4 square meters, can the ground wire be 1.5 square meters? The first answer given here is that it cannot and is not allowed.

Some regulations for socket wiring

There are clear regulations in the construction and acceptance standards for building electrical engineering. Our home's socket wiring is facing the socket in the direction of left zero and right fire and ground. The key point here is that this ground wire must be connected, and there is a clear requirement in the specifications for the ground wire, which is that the ground wire should not be less than half of the phase wire and should not be less than 2.5 square millimeters.

So when the zero and live wires used in our home socket are 4 square meters, the minimum ground wire is also 2.5 square millimeters. The specification states that the cross-sectional area of the ground wire should not be less than 1/2 of the phase line and should not be less than 2.5 square millimeters. You may not quite understand what it means, give an example to illustrate.

When our live wire and zero wire are 16 square millimeters, then 1/2 of them is 8 square millimeters. Obviously, there is no wire of this size, so we should choose a wire of 10 square millimeters at this time. When the live and zero wires of the socket are both 2.5 square millimeters, it is not possible to select them based on half of their size, but rather choose 2.5 square millimeters of wires directly.

How to Connect the Ground Wire of a Home Socket

After knowing the requirements for the wire diameter of the socket ground wire in our home, we also need to know how to connect the ground wire in our home to be qualified and effective.

The grounding wire in our home starts from the indoor distribution box and ends at the grounding terminal of each socket. For example, for the ordinary socket circuit installed indoors, the ground wire is connected from the public grounding terminal strip of the indoor distribution box. After connecting the wire from the ground busbar, the entire wire is directly connected to the first socket of this circuit; Then use and connect in the first socket, connect a tap, connect it to this socket, and then connect the ground wire to the next socket. According to this rule, always connect the ground wires of all sockets in this circuit.

Another thing we need to pay attention to is the wiring inside the distribution box in our home. There must be three incoming wires in the distribution box to ensure the effectiveness of the grounding system. These three wires are a live wire, a zero wire, and a ground wire; The live wire and zero wire are connected to the upper opening of our main switch, and this ground wire is directly connected to the common ground bar in the distribution box. This way, all the ground wires in our home can be connected to the ground of the building. Otherwise, grounding is ineffective. Just like many families only have two entry wires, this type of ground wire is useless even if connected.

Personal suggestions

Personally, I suggest that everyone distribute electricity at home