Industrial electrician, theoretical knowledge of lamp connection!

Are you sure the third line is two fires and one zero? Or are they three lines of fire? What does the grounding section of lighting mean? Ground or neutral? Note that the ground wire is not the same as the neutral wire, the neutral wire is used to form a circuit loop, while the ground wire plays a protective role and must not form a circuit with any circuit.

It's really not very formal, but when it comes to violations, let's ask: what rules have been violated?

Originally, there should have been power meters (three-phase), lighting meters (single-phase). The line leading to the workshop should be 5, the neutral line is common, and the lighting is independent. But if you don't have 5 wires, you can only use one of the power lines for lighting.

The consequence: If the lighting load is not heavy, there are no bad consequences. If the lighting load is too heavy, it will cause serious unevenness of the three-phase load, which will affect the accuracy of the meter.

The most basic: 1. Ohm's law - that is, voltage, current, resistance, high power. 2. Electromagnetic, capacitor, inductance, arc.

Star connection - it is a connection method in which the three ends of the three-phase load are connected together as the common end, and the three heads lead to the connection of three live wires.

For example, phase A load is represented by AX, phase B load is represented by by, and phase C load is represented by CZ, that is, X and Y are connected together with Z, leading to the voltage of A, B, and C wires) The voltage borne by each phase coil of the load is 220 volts, that is, the voltage between the live wire and the neutral line (neutral wire) is 220V.

The ends of the three windings of the three-phase power supply, X, Y, and Z are connected together to form a common point O, and three end wires are drawn from the beginning A, B, and C. It is powered by three sinusoidal power supplies with the same frequency, equal amplitude and 120° phase difference in a certain way.

In general, the potential of the neutral point is close to 0, so the voltage between phase A and the neutral point is close to 220V, and the voltage between phase B and the neutral point, phase C and the neutral point is also close to 220V, so this wiring method can light up the 220V lamp without the neutral line and only 380V voltage.

The star connection method is mainly used in high-voltage large or medium-capacity motors, and the stator winding leads out only three wires. For the star connection, the phases are load balanced, so that the sum of the current vectors flowing through the three phases at any time is equal to zero.

It's been said upstairs, add to it.

Three-phase electricity is a difference of 120 degrees per phase.

The red represents the line voltage, and the black represents the phase voltage.

The effective value of the phase voltage is 220V, the two phase voltages are added, you can use complex calculations, or you can draw a vector diagram as above, UW + UU is UWU, that is, the root number is 3 times the phase voltage, that is, 380V (can be calculated with trigonometric or cosine).

The angle of the line phase is 30 degrees.

These are the basics of electrical engineering, and you can find a book to read.

Otherwise it's hard to explain here.

Therefore, when the star is connected, the voltage of the single bulb is 220V, but because it is a star connection, it is not simply two light packs connected in series, so the outside of the two bulbs is 380V

As an electrician, you need to know how to connect the wiring when you connect the electricity, how to cry when you lay the wire, and know this knowledge.

There are training courses on the market, there are primary, intermediate, and senior electrician training, so let's go to a training class. Yes, it is best to have someone (an experienced electrician) to take you on the construction site so that you can quickly get into the role.

There are many indoor electricians, some are industrial and some are civil, I don't know which one you want to ask. However, generally speaking, there are only three types of indoor electricians, high-voltage, strong and weak. Let's not talk about high pressure, everyone knows it!

Switches, sockets, lights, 220V, etc. belong to strong electricity. TV, **, computer, signal line and the like belong to weak electricity! In a word, it is high voltage that is confused when touched, strong electricity is the electricity that kills people, and weak electricity is weak electricity that does not kill people...

Ha ha... As for the basic knowledge of electricians, there are many kinds of basic knowledge, there are theoretical ones, there are practical ones, which one do you want?

The most basic thing is, don't touch the live wires! Remember.

There's so much to know about the basics of electricians. Look at this.

Or you go to the store and buy a book.

Hello, the main attention to the following points is paid attention to the light cable.

The control line of the lamp should be connected to the wick post on the lamp head, and the control line is not allowed to be connected to the screw mouth to prevent electric shock accidents when replacing the bulb.

The switch requires the control of the live line, and the control of the neutral line is not allowed to prevent electric shock accidents in the maintenance state.

When the neutral line is controlled, after the switch is turned off, there is still a 220V working voltage to ground on the line.

Plumbers work every day, and they learn it after only three months of exposure.

It's easier to learn by finding an electrician to take it down.