Can one terminal in the zero row of the low voltage distribution cabinet crimp more than two neutral

It is definitely not standardized, and it is generally a terminal.

Press one, you can ensure good contact!

To be precise, the specification really does not stipulate how many wires can be pressed on a terminal, only that the connection must be reliable and firm. According to your diagram, different wire diameters, different materials (copper, aluminum) wires are connected to the same terminal, there are indeed potential safety hazards, it is recommended to add a neutral wire terminal row, and then connect separately, the above opinions are for reference only.

There are two main reasons for this; 1. The neutral line terminal is virtually connected. 2. Serious imbalance of three phases. The main reason is the severe imbalance of the three phases.

It would be better to distribute the three phases as evenly as possible. Analysis: 1. The neutral line terminal of the low-voltage distribution box is the working neutral line, which can provide single-phase equipment work.

Therefore, there will be a working current on the working zero line. 2. Poor contact of the neutral terminal is the only reason why the neutral terminal is burned, when the contact is poor, the current passes through the larger contact resistance, consumes a certain amount of electrical energy, and emits a large amount of heat at the same time, and it will burn out for a long time. 3. Regarding the "inquiry channel", it is mainly the implementation of the "inspection and inspection" system of maintenance electricians, which should be subject to maintenance records.

This connection can be used, but does not meet the requirements of the installation specification.

The line is so messy, do you care about compliance or non-compliance? The specification is that the neutral wire terminal is one terminal and one wire.

In order to maintain a good contact surface and not generate heat, one terminal should be crimped with a neutral wire.

Can the neutral wire and the ground wire be crimped in the same wiring copper bar for low-voltage switchgear? What are the normative standards?

Low-voltage switchgear, can the zero-hand nuclear wire and the ground wire be crimped in the same wiring copper bar? What are the normative standards? Don't dig it up!

The zero wire and the ground wire are not the same wire, the neutral wire is the neutral wire in the three-phase four-wire system, and the grounding point is the transformer. It is used for power supply, and the single-phase electrical equipment cannot work normally without a neutral line. The ground wire is the one that discharges static electricity and leakage current, and the grounding point is the ground near the user.

Electrical equipment can work without a ground wire, and some devices don't need a ground wire at all.

The inlet cabinet of the low-voltage distribution cabinet needs to be connected to the zero wire row for safety.

Will there be a neutral line and a ground wire row in the high-voltage cabinet? No, it won't.

The low-voltage cabinet is also called the zero line and the ground wire row according to the specification, although everyone still calls it that, but it is the Soviet standard, which is outdated, and is now called PEN bus and PE bus. When the N-line and PE line are designed according to the specification, the heat should be calibrated and stabilized to determine the cross-section. The PEN line is especially based on the load characteristics, if the harmonics are particularly large, such as the rectifier arc welding with all belts, then the cross-section must be selected according to the harmonics, which may be thicker than the phase wire.

If it is a general building power distribution, there is a specific selection method in GB50054, generally speaking, the PEN bus is selected as the phase wire, and the PE bus shall not be less than half of the phase wire. However, if you buy cabinets, people's cabinets are complete, and you don't have to choose your own.

The three-phase outlet line of the distribution cabinet is 220V, the zero line is 36V, but the low-voltage overhead line is 110V, why?

There will be no voltage on the neutral line under normal circumstances, because the neutral point of the low-voltage transformer is directly grounded, which is equivalent to the connection between the neutral line and the earth.

However, due to the three-phase unbalance of the equipment, the unbalanced current will pass through the neutral line, and if there is current, there will be voltage!

Another problem with overhead lines is that there is a capacitive current between the overhead line and the ground. The two phases are superimposed, so the voltage of the overhead line is generally higher than that in the distribution room. But the exact size is not a fixed value.

There is also the presence of an induced voltage.

Measured with an electric pen? If this is not accurate, it should be measured with a multimeter.