What is the difference between zero line and ground line

In life, many electrical appliances will be used. We should know that the zero line is generally blue and the ground line is generally yellow green or black. Why is it called zero line? What is the function of ground line? What is the difference between ground line and zero line? What is the zero line? The zero line is grounded at the power supply end (power plant, substation and transformer), or repeatedly grounded before entering the house. It is a working grounding wire and a part of the transmission line. The current returns to the power plant through the power plant - live line - load - zero line. The reason why it is called zero line is that it is' grounded 'at the power transformer, so its voltage is zero. The function of the ground wire and the connecting ground wire are grounded at the user end and connected with the metal shell of the electric appliance or the touchable part of the human body, so as to make the shell equipotential with the earth and protect the human body from electric shock. The zero line does not form a loop with the transmission line, and there is no current under normal conditions. Differences between the two 1. The functions are different. The zero line is mainly used in the working circuit, combined with the live line, with current passing through, and the current passed by each phase zero line is equal to the current passed by the corresponding phase live line. The ground wire is mainly a protective wire without any current. 2. The wiring positions are different. The zero line is the line pulled out after the neutral point of the transformer is grounded, and the ground line is the line pulled out from the grounding device of the building. 3. The actual application after electric shock is different. If there is a good ground wire grounding, it can effectively trigger the power failure of the leakage protector and protect the power safety of electrical appliances. The grounding protection wire is connected in parallel in the whole system and is not allowed to pass through the switch. Each household can disconnect the zero line by itself. The two cannot be interchanged. Once the ground wire is used as the working zero line, if the current is too large, the grounding protection line will burn out. At this time, all electrical enclosures below the disconnection point will be charged, which will bring greater risk of electric shock. （LingXianHeDeXianDeOuBieZaiNaLi）