Why are the neutral and ground wires connected?

Introduction Why are the neutral wire and ground wire connected? The neutral wire is directly grounded at the end of the transformer, so it is connected to the ground wire. The leakage circuit breaker is only connected to the live and neutral wires, and its working pr

Why are the neutral and ground wires connected?

The neutral wire is directly grounded at the end of the transformer, so it is connected to the ground wire.

The leakage circuit breaker is only connected to the live wire and the neutral wire. Its working principle is to measure the residual current, that is, under normal circumstances, all current flows from the live wire to the live wire. neutral wire. In simple terms, we can think of the amount entering from the live wire, from the output of the neutral line, the leakage current is zero.

In the event of a leak, part of the current flows from the electrical box to ground, the current in the live wire and neutral wire paths is unbalanced and the difference exceeds the set value (usually 30 mA for domestic use. ), the leakage switch will trip.

Neutral line (N): mainly used in the working circuit and leads to the main line from the neutral point du transformer to earth.

Earth wire (PE): Not used for working circuit, only used as protective wire. Using the absolute "0" voltage of the earth, when a leakage occurs in the equipment shell, the current will flow quickly into the earth, even if the PE line is open circuit, it will flow into the earth from the nearby earthing body. (After grounding the neutral point of the transformer, bring out the main line and repeat grounding every 20 to 30 meters).

Detailed information:

In the TN-S power supply system, the residential power loads are generally different, that is, the three-phase load is unbalanced and the three-phase transformer generally uses Y-YN0 wiring, the neutral points of the three-phase windings of the transformermator are connected together and grounded.

This line leads to the neutral line (N). The main part of the neutral line is also called the neutral line. The neutral line ensures that the voltage of each phase of the three-phase load is unbalanced. is equal to 220 V, so the neutral line, do not install fuses or switches.

These four three-phase wires (U, V, W, N) come from the electrical distribution room to the civil building. Under normal circumstances, each building should have an earthing device that meets national technical standards. standards. The wire removed from the grounding device is the ground wire (PE).

Generally on the first floor of the building, the ground wire and neutral wire of the electrical distribution room are connected together as one, and then divided into two parts to provide the neutral wire and ground wire . For each unit of the building, the objective is to bring up to daterepeatedly removes the neutral line (the main part of the neutral line), to improve the zero protection level of the system and reduce the risk of electric shock in the event of a fault.

According to national standards, the neutral wire has a blue sheath and the ground wire has a yellow-green sheath.

In summary, the neutral line is the line drawn from the neutral point of the transformer, and the ground wire is the line drawn from the grounding device of the building.

Under normal circumstances, the main part of the neutral line will pass a small unbalanced current, but the current through the neutral line of each phase is equal to the current through the live wire of that phase, and ground There is no current flowing in the wire, and the metal shell of the electrical equipment connected to the ground wire has no potential during normal operation. The neutral wire and the ground wire cannot be exchanged, such asIf the leakage protection switch is reversed, it will operate and cut off the power supply.

References:

Baidu Encyclopedia - Ground Wire

References:

< /strong>

Baidu Encyclopedia - Neutral Wire

Can the ground wire and neutral wire of a three-phase motor be connected at the same time

< p>1. You Since it is a diesel generator, it must (usually) be used for its own independent power supply that is not connected to the power grid.

2. According to electrical theory, if your generator's output voltage exceeds 36V, you need to install grounding protection. The main purpose is to protect personal safety in the event of a leak in the circuit. The switch protection function can be triggered immediately to avoidter injuries.

3. At the same time, it should be noted that the switch located at the appropriate position at or behind the generator output must have the necessary protective function to prevent it from tripping in the event of a problem!

No. When the neutral wire and ground wire are connected at the same time, if the motor high level switch has leakage protection, it will act incorrectly due to inaccurate detection of leakage protection and will not be able to provide accurate protection. . This is called “repeated grounding”.

The neutral line should not be grounded repeatedly. In fact, it is not allowed to be grounded repeatedly after the leak detection point.

You can refer to “Repeated Grounding” from Baidu Encyclopedia

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Understanding 18650 Voltage: A Comprehensive Guide to Lithium-Ion Battery Power

    Lithium-ion batteries have become the backbone of modern portable electronics, providing the energy needed for everything from smartphones to electric vehicles. Among the various types of lithium-ion batteries, the 18650 battery stands out as a popular ch
    08-27
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01