Which control switch is the live wire or the neutral wire, there is only the live wire in the switch

It is a switch that controls the live wire on and off to start equipment (such as lights, rice cookers, exhaust fans, etc.). Neither the live wire nor the neutral wire can control the switch.

There are two kinds of switches: single control and double control, double control can be used as single control, single control can not be used as double control.

There are also three annotation methods on the switch: 1) L, L1, L2; 2)com、load；3)com、l1、l2

1)l、l1、l2

The live wire (power incoming line) is connected to L, and L1 is connected to the positive pole of equipment (such as electric lights, rice cookers, exhaust fans, etc.) when single control, and the neutral wire is connected to the negative pole of equipment.

When the dual control is connected to the live wire (power incoming line), the L1 of the two dual controls is connected, the L2 of the two dual controls is connected, and the L of the other dual control is connected to the positive pole of the equipment (such as electric lights, rice cookers, exhaust fans, etc.), and the zero wire is connected to the negative pole of the equipment.

2)com、load

Foreign brand single control switches use this notation method, com represents the common end (i.e., L), and load represents the load (i.e., L1).

The live wire (power incoming line) is connected to the com, the load is connected to the positive pole of the equipment (such as electric lights, rice cookers, exhaust fans, etc.), and the neutral wire is connected to the negative pole of the equipment.

3)com、l1、l2

Foreign brands use this annotation method, com means the common end (i.e., L), and the wiring method is shown in 1).

Upstairs is right, "the switch not only plays the role of switching on and off the light, but also plays the role of protecting the electrical appliances." The switch is connected to the live wire, when the switch turns off the electrical equipment (lamp) (broken wire), your electrical equipment (lamp) and its wire will not have a voltage to the ground (that is, no electricity), so that it will not cause electric shock, and personal safety will be ensured. On the contrary, when you turn off the electrical equipment (lamp), you disconnect the neutral line, and your electrical equipment (lamp) and its wire have a voltage to the ground (that is, live), and when the human body touches them, it will cause electric shock, which is critical to personal safety. ok

If it is the switch of the light, only the live wire is right, the zero line does not need to enter the switch, and the zero line is directly connected to the lamp.

The switch box you see is a live wire, disconnect it into two, connect it at both ends of the switch, the switch is turned on, and the electricity is sent to the lamp through the live wire. And the zero line will and put the lights on.

Circuit short circuit, should be a short circuit in the lamp or between the lines of the neutral live wire, if the light switch is turned on after the short circuit, it is a problem near the lamp. If the entire lighting circuit cannot be sent, it is more troublesome to check along the wiring.

As for what you said that there is no zero line, if it happens in the distribution box of the house, it is covered by decoration, and it is impossible to have no zero line.

Make sure that if you use a three-phase outlet, the wire sequence on the receptacle is:

ground) (zero) + fire).

The mantra is: left, zero, right, fire, and middle ground.

If it is reversed, it may lead to the case of live housing; In particular, it is important to note that leakage may occur if the wire sequence is incorrectly connected.

If the wall jack does not have a ground wire, it is best to pull a ground wire yourself when using the computer, there are two ways:

1) If you live on the first floor, it is best to use an iron drill with a diameter of more than and a length of more than a meter to implant it in the outside of the house, and connect the ground wire of the socket with a cable connection;

2) If it is not on the first floor, it can generally only be connected to one wire, one end is connected to the copper wire, connected to the water pipe or heating pipe to be wound and fixed, and the other end is connected to the ground wire on the wall.

After that, use a standard computer power plug to connect the socket, which is generally normal.

The computer can't be turned on in winter, it may also be related to dust, if the ground wire does not solve the problem, you can try the following methods:

Open the case, clean the dust, especially the CPU fan, graphics card fan and the dust on the memory module, if necessary, you can unplug the memory module, scrub the gold finger with anhydrous alcohol, and then wait for the alcohol to volatilize clean, reinstall the memory module, and generally solve the problem.

Parallel Electrician, Replacement. There is no zero wire, there is a fire wire, and the electrical bulb will not use anything. The power tools used in the decoration construction (except for charging) are also not used, how do they decorate?

The connection principle of the three-hole socket: the left hole is connected to the zero wire, the right hole is connected to the live wire, and the upper hole is connected to the ground wire. Three-pin socket: ...

How to connect the switch socket as follows: There is only a zero line of fire at home, mainly because I don't know whether the live wire or the zero line needs to be wired in detail. The left side you are talking about is a live wire, which is the wrong connection when the construction unit is wiring. The point is that the hole above is ground, so there is no danger.

See all. December 25, 2019 - Different wiring methods are required, and there are currently only two fire neutral wires, so the grounding terminal can only be discarded. Please see the figure below for the wiring method, the live wire enters one end of the switch, and the live wire of the socket is controlled from the other end, and the other wiring.

The switch is only connected to the live wire, not to the neutral wire, and the switch only plays a control role. It is required in the national electricity standard.

In order to use electricity safely, all electrical appliances should be powered off when the switch is turned off, which can effectively protect personal safety.

So be sure to connect to the line of fire, imagine if you connect to the zero line when the electrical appliances are overhauled, you disconnect the switch, the equipment is not connected to the parts, but it is still connected to the line of fire, people will be electrocuted when they touch it, it is very dangerous.

October 17, 2017 - Switch live wire zero line connection diagram Connect the live wire, because the switch is connected to the live wire, there is no electricity on the lamp after the switch is disconnected. If the switch is connected to the zero line, after the switch is disconnected, the lamp is a live wire, or there is electricity, and then when the bulb is replaced.

January 5, 2018 - The switch does not need a neutral wire, the function of the switch is to open or turn on the circuit at a certain point in the closed circuit, the general switch only has two binding posts (one in and one out), and both control the live wire. The switch can not control the neutral line if controlled.

The neutral line is already directly connected to the end of the lamp head. The live wire at the other end of the lamp head is put into the switch box, and the live wire with electricity is also put into the switch box, and the disconnected live wire is controlled by the switch to turn on and off the light.

1. When the switch controls the open state of the zero line, the live wire returns to the zero line through the load, and the zero line live wire has electricity, and it will have the same brightness when measured with an electric pen.

2. When the switch is open, if the wire is aged, through the greasy and humid section, etc., the zero line will have induction electricity, measured with a pen, the zero line will be bright, but obviously not as bright as the live wire.

3. The line with a long installation time will inevitably have weak links such as aging, humidity and damage, and the zero line will have induction electricity, and the amount of electric pen will be bright, but there must be no spark.

The diodes connected in parallel on the relay play a protective role to prevent the relay from being damaged by high voltage due to self-induction when the relay is de-energized and released.

The neutral wire and the live wire are the two main wires in the circuit, and there are some differences in switch control:

1.Neutral wire: A neutral wire is a neutral wire in a circuit, usually identified in blue or white.

It is connected to the neutral point of the power supply and is used to provide a homing path for the power circuit. In a normal working circuit, current enters the electrical equipment through the live wire and then flows back to the power supply through the neutral wire.

2.Live wire: A live wire is a moving wire in a circuit, usually identified in brown or red.

It is a wire that carries electrical energy from the power supply to the electrical equipment, carrying an electric current. FireWire is voltage-based, so you need to pay attention to safety when switching and controlling it.

Differences: Voltage: The livewire has a stuffy orange voltage, usually 220V or 110V, while the neutral wire has a voltage close to zero.

Function: The live wire is the wire that supplies electrical energy to the electrical equipment, and the neutral wire is the homing path that provides the power circuit.

Identification: In electrical circuits, the live wire is usually identified in brown or nuclear red, and the neutral wire is usually identified in blue or white.

In switch control, it is usually only the live wire that needs to be controlled, while the neutral line is usually not directly associated with the switch. The function of the switch is to cut off or connect the live wire to control the switch state of the circuit to change the cover wheel. This enables on/off control of electrical equipment while maintaining a neutral connection to provide a homing path to the power circuit.

The switch should control the live wire, because the live wire is the high potential of the power supply, and the opening is to prevent the human body from touching the dangerous wire. The neutral line is the low potential of the power supply, which is the same potential as the human body, and it is absolutely safe to touch. If the neutral line is arbitrarily interrupted and suspended in the air, there is a risk that it will have a high potential.

Therefore, if the zero line does not answer, it can be arbitrarily interrupted by the switch and cause the possibility of harm.

The switch generally controls the live wire, if the switch is connected to the zero line, the electrical appliance will not work, but it is still electrified, and there are potential safety hazards.

Fireline.

The logo of the live wire on the switch is L, but there will be L1, L2, L3, etc., which all represent the live wire, a variety of switches on the market, there are single open, double open, dodge, etc., if the switch type is different, the connection method is naturally different. Among them, the multi-switch generally does not use the binding post marked with the letter "L" symbol, but uses the common end marked with the letter "com" symbol, so the switch connection method will naturally be different.

Wire installation precautionsIf the electrical appliance is connected in the working state, then whether it is the neutral wire or the live wire, the arc must be generated according to the power of the electricity. However, usually when the neutral wire is connected, the arc will be relatively small, and when the live wire is connected, the arc generated will be relatively larger due to the larger voltage.

At present, the basic household wires are mainly concealed, and for the sake of safety, this concealed installation must be operated by professionals. However, if the wires are installed in the form of surface-mounted, then the wires must not be squeezed or folded, and the wires must be fixed firmly.

The line of control is the line of fire.

If the electric pen. The test end is on, and it is the live wire. If it doesn't light up, it's the zero line. If you can't be sure, you can flip the switch when the power is on, and if the switch is on and off on the top of the watch hand shows 220 volts, it is the control line.

If you find the control line, you need to find the zero line, because the zero line and the ground wire should be distinguished, and the ground wire should be cut off at the total charge, at this time there is only the live wire and the neutral line, and then pass through the multimeter.

to be sure. If the voltage value reaches 220 volts, this wire and the live wire are 220 volts, which is the neutral line. If the voltage value is 0, it is the ground wire.

Difference Between Control Line and Live Line

1. Different functions: The function of the control line is to control the action of the relay and control the contactor.

The action is generally controlled by PLC. The live wire is a power supply section, and the control line is basically controlled or monitored by normally open or normally off.

2. Different colors: In general, the control line is green, while the live line is yellow, green, and red.

How to choose a wire

1. When we buy wires, we have to see if it has a quality system.

The certificate also depends on whether its certificate is standardized, whether there is a factory address, production date, inspection seal, factory name, and whether there is a printed voltage, specification, trademark, etc. on the wire.

Also pay attention to observe the cross-section of the copper core of the wire, generally good quality copper color is soft, bright color, otherwise it is a defective product. Of course, we also have to check the length of the wire, many businesses in order to reduce costs, will fake the length of the wire, some bad businesses will be less than ten meters, such as this wire has 30 meters, but he has to mark 40 meters, deceive consumers.

2. When buying wire, we take a wire end and bend it repeatedly, generally soft to the touch, then its fatigue strength is better, if it is rubber or plastic, it feels more elastic to the touch, and the wire insulator.

There is no cracking, and the quality of this wire is also very good.

3. The main line refers to the two leading lines between the total power supply and the electrical appliances, because the electrical load is relatively large, so the main line must be made of thick copper core wire.

The switch controls the fire line of faith. There will be no electricity at the zero line. This is due to the fact that the fire line has been disconnected by the opening of the bucket tan. The live wire will not pass through the switch. Connect to the zero line. So. We must keep in mind this sentence. The air balance is called the live wire inlet switch.

The light switch should control the live wire.

1. The installation of the switch needs to be correct, after all, it is related to the safety of electricity, if it is not installed correctly, it will cause the switch to leak and cause electric shock accidents. The switch is on and off the live wire, which can control the on/off of the live wire, and ensure that the electrical appliances are not charged when overhauling the electrical appliances.

2. It is understood that the switch that controls the lamp should be connected between the live wire and the bulb, when the switch is disconnected, the circuit not only has no current to pass through, but also the lamp is disconnected from the live wire, so as to prevent people from touching the bulb and the live wire to form a path, and an electric shock accident occurs. When the switch of the lamp at home is reversed, although the normal control of the opening and closing of the lamp can also be realized, this is a serious violation of the operating procedures, because the live wire of the ordinary lamp switch enters the switch, and the zero line of the lamp is not allowed to enter the switch. Because once the neutral wire enters the switch, the switch cannot be disconnected and connected to the live wire, which is always connected and live.

According to the low-voltage electrical safety regulations, the live wire must enter the switch.

Because, the live wire into the switch, you can control the on/off of the live wire, and only when overhauling the electrical appliances can we ensure that the electrical appliances are not electrified! If the switch is installed on the zero line, although it can play the effect of turning off the electrical appliance, but at this time the live wire is still connected with the electrical appliance, and the electrical appliance is still charged at this time, and the human body will flow into the earth through the human body in case of touching the live part of the electrical appliance, and an electric shock accident will occur.