How to control a light with multiple switches

One lamp, 2 switches, power supply, a number of wires.

A system is formed with 2 switches and wires, which are connected in series with the lamp power supply.

The circuit diagram of this system is as follows.

Draw 2 parallel wires ab

The left interface is A1, B1, and the right excuse is A2, B2

The left interface of the trunk road is C1 and the right interface is C2

The two electric bonds are at C1 and C2 respectively.

When one electric key is connected to A1C1 and the other is connected to A2C2, the circuit is on.

When one electric key is connected to A1C1 and the other is connected to B2C2, the circuit is not connected.

When one electric key is connected to B1C1 and the other is connected to B2C2, the circuit is on.

When one electric key is connected to B2C1 and the other is connected to A2C2, the circuit is not connected, so as long as you press the electric button once, you can change the state of the light once.

Hope it helps.

The switches are all in parallel or the switches are all in series. If they are all connected in parallel, as long as any switch is closed, the light can be turned on. If they are all connected in series, all switches must be turned off for the lights to be on.

Do you have to turn on all the switches to turn on the lights? I guess every switch can be controlled, right? Parallel lines are possible.

You can go to the hardware store to buy a few duplex switches, you can buy as many switches as you want, which is much more convenient.

For example, for example, the switch upstairs and downstairs, control a light at the same time, no matter which switch is dialed to the other side, the light will be on or off, then two single-pole double-throw switches are needed, the two interfaces of the switch are connected to the lamp, the two throwing ports are connected to the ground wire and the live wire respectively, and the other two throwing ports are disconnected, so it's OK.

Your question is not clear, you need to tell me the status of your switch! Is it on or off??

With two single-blade and leather double-throw switches, two separate switches can be used to control the same lamp.

The wiring diagram is as follows:

This kind of switch is often used in the staircase is the shed to go up and down the stairs, it is easy to turn on and off the lights at night, and it is also to save electricity.

Dual-open and dual-control! You need to understand whether you can control one place or two places! That is, there is simply one place to control the light, or two places, such as upstairs and downstairs or entering the door, and two places at the head of the bed to control the light.

Wiring method: 1. Two buttons with a certain distance control a group of light sources at the same time. First, connect the live wire to the center line post of one dual control switch, and the lamp head (or the center tongue of the screw head) is connected to the center line post of another double control switch.

2. Next, connect the back and forth wires to form a loop, that is, use two green wires to arbitrarily connect the upper and lower two binding posts, and finally the zero wire is directly connected to another contact of the lamp head (or the thread of the screw lamphead), so that the connection is completed.

The dual-control switch is a kind of switch that can realize the switch of the lamp in different places, and it has three terminal points, one is the common end, and the other two terminals are on or off. A double-link dual-control switch is a panel with two dual-control switches. Single-control duplex is a switch board composed of two rocker switches, which control two lights or two groups of lights respectively.

Circuit: Two switches control two lights.

The diagram drawn specifically for you, you can wire according to the diagram, you can ask questions, the zero line goes directly to the two blue wires of the lamp port, the live wire goes to the switch, and the middle and indirect line posts of the two switches are connected, and then the remaining one binding post from each switch leads to the lamp port, so that it is OK.

The zero line feeds directly into the lamp.

The live wire enters the switch and connects the L terminals of the two switches together, and the L1 terminal of each switch comes out with a wire to control a lamp.

The live wires should be connected in parallel, and the rest should be connected to one switch for each of the two.

2 switches control a lamp, this control method is professionally called "single open and double control";

Single switch dual control: There is one switch button on each of the two control panels, and the two switch buttons control an electrical circuit at the same time. For example, a light installed on a staircase can be turned on or off on the stairs or under the stairs, which is very simple. The wiring diagram is as follows:

A dual-control switch is a type of switch that can realize remote control switching. It has three connection points, one is a common terminal, which is connected or disconnected from the other two terminals. A dual-control switch is a panel with two dual-control switches.

Single-control duplex means that a switch board is composed of two rocker switches, which control two lights or two groups of lights respectively.

The switch used by two switches to control a lamp must be a double-connected switch, and a single-connected switch cannot be controlled. If two switches with a single connection are used in parallel, it is more troublesome to turn on and off the lights. The connection method using the duplex switch is shown in the attached drawing

This kind of switch is special, called a single-pole double-branch switch.

The simpler one is the wiring method in the figure above. The upstairs switch QF1 and the downstairs switch QF2 are both bidirectional switches. It can be wired at both ends, and switches of different lines can be connected at both ends. In this way, both QF1 and QF2 can turn on and off the lights at will.

Now the switch to turn off the light can be turned on. It is estimated that if one of the A and B lines is not connected or disconnected, it will cause either of the lights to turn off when the lights are turned on, but only the switch of the lights can turn on the lights.

If you control the single-pole single-throw switch, you can't achieve the way of turning off the lights downstairs upstairs, which requires a single-pole double-throw switch, and since your problem is this, then your two switches can only be connected in parallel.

That is, the two switches first connect their 2 wires in parallel, and then connect one end to the power supply, the other end to the electrical appliance, and then the other end of the electrical appliance to the power supply.

- Switch ---

- Switch ---

- Electrical appliances --- power ---

If you control the single-pole single-throw switch, you can't achieve the way of turning off the lights downstairs upstairs, which requires a single-pole double-throw switch, and since your problem is this, then your two switches can only be connected in parallel.

That is, the two switches first connect their 2 wires in parallel, and then connect one end to the power supply, the other end to the electrical appliance, and then the other end of the electrical appliance to the power supply.

- Switch ---

- Switch ---

- Electrical appliances --- power ---

Here the small bulb is on the dry road and the switch is on the side road.

The lamp and the power supply are connected in series, and the two switches are connected in parallel.

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If it is said that both are closed to make the light open, then the two switches are connected in series with the lamp, and if one is closed, the light is turned on, then the two switches are connected in parallel.

Parallel connection. The switch of the ordinary two binding posts cannot be wired into a duplex switch to control the effect of a lamp, because the contacts are not enough.

If you must use two ordinary switches of two binding posts to control a lamp, two new contactors must be added to achieve it, that is, a switch controls a contactor, and then uses the contacts of the contactor to realize a double switch.

Two switches control a lamp to use two controls and one lamp wiring, which is the standard connection method of lighting electrical circuits, that is, the live wire into the switch, the neutral line into the lamp holder (connected with the threaded lamp base), connecting the lamp holder and the switch.

Connect the middle of a switch with two three-ended switch live wires. The outputs on both sides are connected to the spirit of a switch, both sides. The lamp head is connected to the middle of the switch, and you can.

If you don't understand well, you can buy a switch when the merchant helps you choose, now the switch basically has this function, you only need to wire according to the marked point, but the electrician is a special industry, it is recommended that professional things be done by professionals.

This is the skill of the line, generally looking for a professional wiring electrician will give you a wire to control two switches, this is their skill.

Wiring diagram of the three-control switchAs follows:

Switches A and C of the one-lamp triple-control switch use single-pole double-throw switches, while B uses double-pole double-throw switches. Any one of the three switches, A, B, and C, can control the circuit on and off independently. The single-pole double-throw switch realizes the physical wiring diagram of one light and three controls, three positions control a lamp, two dual-control switches plus a midway switch, four commanding positions to control a lamp, and two dual-control switches plus two balances to make only the midway switch.

In home decoration projects, it is sometimes necessary to control a lamp with three switches:

For example, in a house with two rooms, one living room, one kitchen and one bathroom, the lighting in the living room needs to be controlled by three switches installed in the two rooms and the living room.

At this time, this control cannot be achieved with three dual-control switches; If a single control switch and two dual control switches are used, although theoretically feasible, but it is inconvenient to use in practice, when the two double control switches are not connected, the single control switch loses its effect, so this scheme is also not advisable. It is now implemented with two dual-control switches and a new type of switch.

The power supply (right end) connector is connected to two wires and one lamp each, and both lights and wires are connected to the left end of the power supply.

Method Steps:

1.When buying, pay attention to the switch in the figure below, there are three binding posts, L, L1, L2;

2.Connect L1 and L2 1, then L2 and L2, the L termination of one switch is connected to the live wire, and the L termination of the other switch is connected to the electrical appliances, such as a light bulb, and then the other end of the light bulb is connected to the neutral wire;

3.After the power is on, it is completed, it must be noted that in the process of connecting the power supply, the zero line of the live wire must not be connected wrong, in actual operation, put three wires between the two switches;

Among them, the L1 of the two switches is turned on with two, and the L2 is turned on, the L termination of one switch is connected to the live wire, and the L termination of the other switch is connected to the bulb, and then connected with the neutral wire.

Precautions. The live wire and the neutral line must not be reversed.