Content:

In a large room and long corridor Using one switch is very inconvenient. You will have to be in the dark either before turning it on or after turning it off. To avoid such an inconvenience, pass-through switches (alternative names - switches, switches) are installed in two places in a large room or in a long corridor at its entrance and exit.

With their help, one light source can be controlled from two places - turned on in one place and turned off in another place, or vice versa. Thanks to this solution, the path in a large room or long corridor is always illuminated along its entire length, which is convenient and safe. This simple solution to a common lighting problem nevertheless poses the following questions.

• If there is a single-key pass-through switch, why connect a two-key pass-through switch?
• What is characteristic of the connection diagram of a pass-through two-key switch?

It is based on the principle of changeover contacts

The two-key pass-through switch contains changeover contacts. Just like the simpler single-key version. For a better understanding of the differences that these pass-through switches have, further on the diagrams we will consider their general connection sequences from 2 places:

The difference is obvious. Looking at both diagrams, it is immediately noticeable how the phase wire is connected. It is connected to the first switch. Two-key connection diagram pass-through switch provides four wires or cables connecting both switches. And there are only two single-key ones. Then there are connections to the lamp lamps.

In the diagram with single-key switches, they are connected by two wires - cables. When both changeover contacts are connected to the same wire, the light bulb lights up. This is what the diagram of a single-key device shows. Switching the first switch of this circuit opens the connection with the lower conductor, and then the changeover contact is already connected to the upper conductor. The light goes out due to a break in the electrical circuit.

But if you do the same with the second switch, a connection will appear with the first conductor, and the light will turn on again. Obviously, the control of lamps by such switches is based on the transfer of contacts. That is why the contacts themselves, and the principle of operation of switches with them, are also called changeover contacts.

What's special about a two-key switch?

The principle of operation of a switch with one key discussed above demonstrates the possibility of connecting a moving contact with only one of two conductors. The two-key switch does the same thing. But its connection to the lighting system is made using a second changeover contact in each switch with two wires between them.

Considering a two-key pass-through switch, the connection diagram of which has already been shown above, we are dealing with dual single-key switches. Also, the double pass-through switch is distinguished by the use of four wires - cables. Each electrical circuit with one of them is an independent part of the lighting system, since it supplies power to a separate lamp without any mutual influence on the remaining elements of the circuit.

Considering the design of a double pass-through switch in connection with the diagram of its inclusion in the lighting system, we can conditionally designate the input and output in it. They have different quantities terminals for connecting wires - either 2 or 4. However, the design of the double switch has different manufacturers electrical fittings may vary. Please note this before connecting the two-key switch.

For example, you can find two-key switches with 1 input terminal for connecting a phase cable, 1 output terminal for connecting a separate light bulb, and 4 output terminals for connecting intermediate conductors. Although, based on total number terminals, of which there are still 6 pieces, such a two-key switch must be connected according to the diagram already shown above. An example of such a switch design can be products from Legrand.

If we talk about specific examples installations of double pass-through switches, we can mention large rooms and offices, bedrooms, in which the light can be turned on at the entrance, and turned off while lying under a blanket, in dachas and personal plots private houses with long paths and widely spaced lamps.

General rules for joining

Let's look again at connecting a two-key switch according to the diagram above. It is generally considered general scheme. This is explained by some possible differences due to changes in the design, which have already been mentioned (about Legrand products). The diagram shows connected to the light bulbs neutral wire. The second switch is connected to the phase wire by the terminals of the first and second keys. The first key makes contact with one of the two terminals. Two conductors are connected to them.

They are also connected to the terminals between which the first key in the second switch is in contact. The conductor connected to it then goes to the first lamp. The conductors are connected to the second keys of switches 1 and 2 in the same way. With an increase in the number of changeover contacts, the number of connections increases, and most importantly, the number of wires in the junction box. To avoid errors, before connecting the pass-through switch, it is recommended to mark the wires and terminals.

• Another feature of pass-through switches is the absence of permanent positions for the keys. They do not have the “ON” function, just like vice versa in one position. The switches are interconnected, and the flow of current through the changeover contacts is determined by both switches for each position of these contacts.

Example of a practical connection diagram

The first priority is to connect the phase conductor to the left and right keys of different switches (red lines). Then four intermediate conductors are connected. It is recommended, just like in the image, to use connecting wires - cables of three different colors. This will avoid installation errors. It would not be superfluous to number the terminals, if this is not on the product body, and attach the corresponding number tags to the ends of the connecting conductors. Then you will definitely be able to avoid mistakes in the junction box.

At installation work When connecting (sometimes the word disconnection is also used) pass-through switches, a standard set of tools and accessories is used:

• pliers;
• wrenches(sometimes can be useful for some lamps);
• level;
• wire cutters;
• wire strippers or sharp knife;
• screwdriver suitable shape;
• insulating tape;
• set of terminal blocks.

We tried to inform our readers about the main nuances of pass-through switches, which should be useful in practice. We are always happy to help with answers to your questions.

IN standard apartments The wiring is often already done and the light bulbs are connected. But what if you want to build something non-standard? There is no need to be afraid of pulling new wires and understanding the connection diagram. It's actually not difficult. Let's figure out how to connect a two-key switch to two light bulbs and add another lamp to the wall.

1. Preparation of a connection diagram.
2. Calculation of required materials.
3. Purchase of components.
4. Selection of tools.

We draw a diagram for connecting a two-key switch for two light bulbs

If you listen to the well-known saying: “Measure seven times and cut once,” then any work begins with measurements. Therefore, we should begin our work by going to tool box at the roulette table. But the problem is we don’t know what to measure. This means we need to decide what we already have and what we want to get.

Entering the kitchen we see a chandelier, a switch and a small lid right under the ceiling. The junction box is hidden there. It is called so because from there the voltage is distributed through the wires to consumers. Consumers are sockets with a refrigerator, electric kettle and microwave included in them, as well as our chandelier. We are not interested in sockets, but the chandelier is.

The next step is to try to draw a diagram of the current connection of the chandelier.

Wiring diagram for the chandelier before replacing the switch

Now let’s finish drawing what we want to add - an additional light bulb on the wall.

Connection diagram for a 2-button switch for 2 light bulbs

The previous diagram shows how to connect, but how to pull the wires between the sconce and the button - not very well. Therefore, we will depict another wiring diagram for connecting a double switch for two light bulbs.

Cable laying diagram for double switch

Let's look again:

1. Now we have B1 in place single-gang switch, but you need to install a two-key one.
2. A line comes out of the box on L1 - this is our chandelier in the center of the ceiling.
3. From the same box you need to stretch the wire to lamp L2 - this is a new lamp.

Now you need to decide on the path that the cable will take from the switch to the box and then to the lamp.

We make measurements and calculations

We're not trying to start major renovation, but we try to do the job with the least time and technical costs. There are two options for this:

1. Lay all wiring in cable ducts. These are narrow hollow plastic strips with a removable top cover. They look neat on any wall because they have a compact shape and a pure white color.
2. Use the junction of the vertical plane and the ceiling. Even if the house is built of concrete panels, they do not fit tightly at the corners. And if you are not afraid of getting a little dirty, you can clean the joint of putty and make a gasket along the corner. All that remains is to install a plastic channel to the switch and to the lamp.

The first option is characterized by speed of execution and minimal amount of garbage, but a large number of additional elements on the wall that you have to put up with. The second option makes the gasket less noticeable, but preparation involves “picking” in the wall and a lot of dust. We choose the appropriate option.

Calculation of conductors

After we have decided on the route, we measure the length of the wire from the switch to the intended installation location of the lamp.

The first section from the switch to the junction box can be run stranded wire in double insulation, if one is on sale .

You need to buy a meter more cable in order to produce sections for connecting sconces, switches and connections in the junction box. It's better to have a little left than not enough.

Cable and wire are two different things. The wire is a single monolithic conductor or a group of twisted conductors - bare or covered with insulation. A cable consists of two or more insulated conductors enclosed in a common sheath.

A cable differs from a wire by the presence of several conductors enclosed in a common sheath

The next step is to determine the cross-section of the wires.

To calculate the cross section, you can use any online calculator. It can be easily found on the Internet.

We accept:

• light bulb power 0.1 kW (100 W), with a reserve;
• length 10 meters;
• The material is copper, because it is more reliable.

As a result we got calculated value S = 0.01554 mm 2. Recommended cross-section is 0.5 mm 2 .

• mains voltage - 220 volts;
• The maximum lamp power is 100 watts;
• We calculate the current strength I = P / U = 100 / 220 = 0.4545 A.

To determine the cross-sectional area, we recall the second ratio: the cross-section of the conductor is equal to the current strength divided by the density of the current passing through it:

• in order not to waste time on complex formulas, we take the current density for copper equal to 10 A/mm 2 (with a margin);
• We consider: S = 0.4545 / 10 = 0.04545 mm 2;
• To ensure mechanical strength, the wire that will be laid under the plaster is taken with a larger cross-section S = 1.5 mm 2.

Online calculation showed a result three times less. For our lamp this is insignificant. Even if we choose a cross section equal to 0.5 mm 2, it will still be with a tenfold margin. But if you connect something more powerful, then it is better to do the calculation on paper. Therefore, it is always worth checking the calculations on paper, and if doubts remain, it is better to play it safe and buy a thicker cable.

Cable channel calculation

Produced as follows:

The cross-section of the box should be approximately 30–40% greater than the thickness of the insulated cable passing through it. The sketch shows two sections of a round and a flat sample. With the same technical parameters specified dimensions almost the same. Therefore, the calculation for a round cable is also suitable for a flat one:

• we accept: D = 8 mm, which means area S = D 2 / 4 * 3.14 = 64 / 4 * 3.14 = 50.24 mm 2;
• the minimum possible cross-section of the box is 12 * 12 = 144 mm 2;
• Conclusion: you can use plastic for wiring with a minimum cross-section. It suits us with a margin of almost 200%.

To choose the correct cable channel size, calculate the cross-sectional area of ​​the cable

Now that we have decided how to lay the cable and specified its length, we can go to the store.

We purchase what you need

You need to ask the seller about the quality of the material and its cross-section. New shipments of electrical goods may not always be what they appear on the price tags. Sellers know this. You can ask the following questions:

1. The wires are actually copper or copper-plated aluminum.
2. Do the transverse dimensions correspond to those specified in the documentation?
3. Are there any analogues with a full cross-section and appropriate material, how much do they cost?

After finding out all the details, we buy:

• cable;
• cable channel;
• lamp;
• electrical tape;
• plastic dowels and screws:
  • the cable channel is attached at the rate of one point per 50 cm;
  • If there are gaps, you can fix them more often. Therefore, it would be good to take another ten in reserve.
• switch. It is worth asking to see several types that differ in the design of the connecting contacts. Contacts can be self-clamping, self-tapping or screw-type. It is more reliable to use a screw with a counter thread in metal.

For our case, even if the cross section differs by 30% from the specified one, this is not very scary. Chinese manufacturers sometimes produce 1.2 and 0.75 mm 2 instead of sections of 1.5 and 1 mm 2, respectively. The power consumption of the sconce is not too large, so there is no need to worry about the conductor heating up. However, you can fight for your money, especially since if you put the cable in a groove, then changing it in the future will be difficult and expensive.

Choosing tools

We will need:

• roulette;
• level;
• side cutters;
• screwdriver;
• hammer;
• phase indicator;
• insulating tape;
• a powerful mechanic's screwdriver or other suitable tool if you want to hide the cable under putty;
• drill or hammer drill for attaching the cable channel.

The cable channel can be glued to the wall liquid nails, but if necessary, it will be impossible to carefully dismantle it.

Connecting a double switch to two light bulbs

Is it possible to prepare for connection: fasten the box or remove the finishing layer along the ceiling corner with voltage applied?

Plastic profiles can be attached, but not in the electrical wiring area. At first glance, it seems that the laying of the network should be carried out according to certain geometric rules. If you keep in mind ceiling corner, then it is always located there. But wiring on walls can be installed in the most unpredictable ways. Therefore, it is safe to attach a horizontal line 10 cm below the ceiling if this meets aesthetic requirements. In other cases, it is better to go deep into the wall and drill with the machine switched off to avoid a short circuit.

The laying of wires between points does not always correspond to geometric constructions

We lay the cables from the two-key switch to the lamp

We prepare grooves along the chosen path or install plastic boxes vertically and horizontally using a level.

From the connection diagram of a double switch and two light bulbs, it can be seen that by changing a single-key switch to a two-key switch, we add only one wire. Just the one we bought - a single-core, double-insulated wire. We pull him towards the box. And from there - a two-core cable to a new lighting point. The new “tails” remain outside the box for now. We remove the old switch.

Now that preparatory work completed, you can begin connecting the wires.

When repairing the electrical network, never work under voltage. Therefore, before you begin any work with a junction box, lighting fixture, or anything else, be sure to turn off the introductory machine on the shield.

Connecting the wires in the box

The main thing is not to mix up the ends in the junction box. Before starting work, we will see three twisted bundles of wires at the connection point: (1), (2), (3).

Visual diagram of connecting a two-key switch

1. We remove the insulation from them and move them apart. We make sure that there is no contact between them.

   All wires must be spread apart and not touch each other

2. We unscrew the light bulb from the chandelier (L1) in the ceiling, remove the plugs from the sockets.
3. We separate the ends of the removed switch (B1).

   We also separate the wires that remain from the old switch to the sides

4. We remove the additional ends that will be connected outside the box so that they do not interfere with the connection.
5. We turn on the machine.
6. We look for the incoming phase with an indicator. Since nothing is turned on anywhere, only one wire (1) will light up - the one we were looking for.

   When you bring the indicator to the phase wire, the light bulb will start to glow

7. The one coming in paired with him is the incoming zero (2).
8. We check the phase at the ends of the chandelier switch (B1). The wire that lights up will be common on the new two-gang switch (5).
9. We turn off the machine on the panel, connect the found ends (5) and (6).

   Connect the found wires to the switch

10. We turn on the machine, then the chandelier. Since there is no light bulb (L1), it will not light up, but the phase will fall on the wire that goes to ceiling lamp(3) and further to wire (7). This will display an indicator.
11. The second wire, lying in the distribution box along with the phase wire from the chandelier (8), will be connected to the input zero (2), which we previously determined in the first pair. This is a test of the correctness of our actions.
12. The wires for the ceiling lights will go up, so they may end up in the same bundle as the incoming ones. But this does not change the order in which the ends are determined.
13. Most likely, two more wires go from the input zero (1) and phase (2) to the sockets (P). This is standard kitchen wiring.
14. The simplest thing remains: turn off the machine on the panel, connect one wire of the wall lighting to the incoming zero, and the second to the end from the switch at point (4).

It's always scary to climb into electrical connections without appropriate training. But if you carefully study the described procedure for connecting a double switch for two light bulbs, then nothing will be complicated.

Difficulties in connecting a double switch to lighting wiring usually arise for an inexperienced person, because... For any electrician, such work does not present any difficulties.

In apartments, two-key switches are often installed to turn on lights in separate bathrooms and toilets. In general, there is large number options for using double switches, but the connection diagram is the same in any case.

Fig. 1 - Visual diagram of connecting a double switch.

If you have ever connected a single-key switch, then the question of how to connect a two-key switch will not arise, since the circuit is almost identical. To put it simply in simple language, That double switch lights are two single lights in one whole body.

When performing work on connecting a switch with 2 keys, you need to focus on the following important points:
1. The light switch must be installed on the phase wire. It is very easy to determine it using an indicator screwdriver.
2. Before starting electrical installation work, be sure to turn off the power to the wiring at the entrance to the house or apartment.
3. Carefully read the instructions supplied with the product and follow its instructions. This will make it easier for you to understand where the input wire from the electrical network and the output to the lighting device are located.
Do not ignore these recommendations, because... it could save your life.

Wiring a switch with two keys is a little more difficult than a regular single one. It has one input contact for the phase wire (indicated by the letter " L") from the main electrical network (coming from the junction box) and two output terminals to which wires from lamps (chandeliers or lamps) are connected.

Fig. 2 - how to connect a double switch.

First you need to remove the key overlays, unscrew the plastic frame under them and the outer casing of the device. This way you will get to the main working elements of the ceramic-based device. In this assembly, one terminal will be visible on one side of the key mechanism, and on the opposite side there will be two of them from it - for wires to two separate lamps (or to two lamps of one lamp).

Now they produce two-key switches of two types of connections with a wire:

• with screw terminals;
• with clamp contacts.

1. In the first type, the ends of the wire, stripped of insulation, are inserted into special holes and then clamped as tightly as possible with a screw.

2. In the second, you need to insert the stripped ends of the corresponding wires into separate holes and clamp them with a special clamp (even if it seems to you that everything is very tricky, in fact you can easily cope with this task).

Be sure to check the quality of fastening of the wires by pulling each of them.

It is necessary to strip the ends of the wires so that there are only enough of them to connect to the terminals. There should be no exposed wires after the screw connection, as this can lead to a short circuit.
Be careful!

The wires are connected to the 2-key switch and now it can be mounted in its place on the wall. Then we put everything on top one by one removed parts casing in reverse order.

In order to correctly connect a two-key switch to a chandelier, you must first understand the ceiling wiring. According to Euro standards there is strict rules by the color of each wire, which must correspond to phase, neutral and ground. But domestic electrical installers (especially for old apartments) use the cable that is at hand. Therefore, you always need to clarify the function of each wire.

In order not to make a mistake and correctly identify the phase wire on the ceiling (or from the wall), you must:

• separate the wires to the sides (so that when voltage is applied there is no short circuit);
• apply voltage by pressing the switch keys;
• Check with a voltage indicator or multimeter which wires are receiving voltage.

So, you have decided which wires are phase “ L"and which one is zero" N". Next, you need to correctly connect the double switch to the chandelier at the installation site:

1. Neutral working wire " N"can be connected into one and hooked up to two lamps in one connection.
2. Each phase wire " L» must be connected to a separate connection for each lamp.

The correct diagram for connecting a switch with two keys to a chandelier is shown in Figure No. 3.

Fig. 3 - diagram of connecting two key switches to the chandelier.

If you need to connect a double switch to several lamps, for example, five, six, etc., then in principle there are no special differences in making this connection. All you need:

1. Group the lamps in such a way that they turn on according to a certain number. For example, 1 and 5, or 3 and 3.
2. Connect the neutral working wire to each group of lamps " N"(one for all lamps).
3. Connect a phase wire to each group of lamps " L"(for example, three lamps have one phase wire, three other lamps have a second phase wire).

The correct diagram for connecting a switch with two keys to a chandelier with several lamps is shown in Figure No. 4.

Fig. 4 - diagram of connecting a double switch to a chandelier with several lamps.

How to connect two chandeliers to a switch with two keys.

If you need to connect a two-key switch to two chandeliers (or lamps) in your apartment, then this can be organized quite simply. The connection diagram is practically no different from the above. See figure #5.

How to connect two chandeliers to a switch with two keys.

Tools for connecting a double switch.

Any electrical installation work requires an understanding and knowledge of basic electrical engineering standards. More experienced performers may also benefit from the acquired skills in this matter. However, these two factors are not enough to install a two-key switch. It is also necessary to have the appropriate tool available, because bare hands you won't work.

To perform this type of electrical work you will need the following:

• screwdrivers with straight and Phillips blades;
• wire cutters (side cutters);
• insulating tape;
• pliers;
• a special screwdriver - phase indicator (or multimeter tester).

In addition to these basic tools, you will need special devices for connecting wires. For these purposes you need to prepare:

• pads, in which the wires are clamped with a screw;
• connecting insulating clamps (or spring);
• knife for cleaning the end of the wire from insulation.

In most cases, electricians connect wires using a so-called “twist” and wrap it with insulation.

If you have such tools and devices on hand, connecting a switch with two keys will be quite simple.

Conclusion.

All the connection options we have considered are the most common, you must remember the following:

• First of all, determine the phase " L«;
• the device is placed only on the phase wire;
• take into account the manufacturer's recommendations;
• be sure to check the tightness of the wire ends being held by the screws on the terminals;
• When working, follow safety precautions.

As you can see, there are no particular difficulties in this electrical work no, you just need to pay attention to the working unit and install the switch on the desired wire.

I would also like to draw your attention to the fact that if you are not confident in your abilities, it is better to contact an experienced specialist who will do such work quickly and efficiently. We hope that the recommendations from ElectroManual.ru will help fill your home with light.

1. Distribution box - the place where the wires are connected and routed in different directions.

2. Twisting - connecting wires to protect against excess resistance, which will lead to constant heating of the contacts.

There should always be light in residential and utility rooms. A group of light bulbs is used for lighting; the convenience of their use directly depends on the availability of a suitable switch. They come in single, double and triple, but the most popular is double.

Two-gang switch

The device consists of the following elements:

• Plastic body.
• One input and two output terminals.
• Two keys.
• In some types there is a light indicator.

Operating principle

The device, using its individual keys, can supply and interrupt the current going directly to the lighting fixtures.

Advantages and Disadvantages

• Using different keys you can turn on and off certain groups of lamps.
• Saves cables during installation (one is needed), because installing two single switches requires laying separate ones.
• If it is installed for a large number of light bulbs, they can only turn on part of them (light adjustment), and this saves electricity.
• Used in rooms with high humidity.
• Does not require special care.
• Easy to install.

Nuance: The case is made of durable plastic, but can burst from strong physical impact.

How to connect with your own hands?

Before starting work, you need to familiarize yourself with the diagram and prepare the necessary tools, otherwise the process will take a lot of time and effort. Taking into account all the nuances, the connection is within the power of an ordinary user, and not a professional electrician.

Required tools:

• Switch and plastic mold (glass).
• Curly and indicator screwdriver.
• Crimping lugs and special tools (crimping).
• Construction knife.

Step-by-step connection process:

1. Initially, the power supply throughout the house or apartment is turned off using a switch in the panel block.
2. The switch is disassembled: the keys and the housing are carefully removed so that there is access to the terminal blocks.
3. A special plastic form is mounted into a suitable hole in the wall, which protects the entire mechanism from various undesirable factors. A three-core cable is passed through a hole in the housing.
4. The edges of these conductors must be cleared of insulation. Using a knife, approximately 1-1.5 cm is cut, the main thing is not to damage the copper or aluminum base.
5. Crimp lugs are placed on the edges of the cores and inserted into a special crimp (pressed). This helps protect them during the bolting process in the circuit breaker.
6. Of the three wires, it is necessary to calculate the phase one. To do this, the room is connected to the current, and the end indicator screwdriver alternately leans against the bare tips. If the diode in the middle of the plastic transparent screwdriver lights up, this is a phase. After discovery the right wire– the room is de-energized again.
7. The end of the input phase is placed in the switch hole and clamped with a screwdriver. As a rule, it is located at the top and is marked by the manufacturers with the “L” icon.
8. The ends of the other two wires are placed in the terminals that are located below.
9. When the wires are secured and checked, the body and the base must be combined together and placed in a plastic base in the wall and secured (alternately tighten the side bolts that expand the metal petals). Two keys (caps) are attached.
10. Next, the switch in the panel block restores the supply of electricity throughout the house, after which its performance and correct functioning are checked.

Safety precautions

Work on connecting an electrical appliance is carried out only when the room is completely de-energized. Neglecting this condition may result in electric shock, hand burns or death.

All tools used must have insulating elements (plastic handles, body). To fully protect a person, it is advisable to wear special gloves on your hands and walk in rubber shoes (materials are dielectrics).

Connection diagram for two groups of light bulbs

• In order for the flow of electricity to diverge in the room, there must be a device mounted into the wall - this key element. Initially, a two-core cable is inserted into it from the panel block (one wire is connected to the phase, and the second to zero).
• From each group of lighting fixtures, a two-core cable is also laid to the box. The cable contains two wires with insulation of different colors (for example, red “zero” and blue “phase”).
• The three red wires are connected together by twisting or terminals. They serve as a continuous base connected to all light bulbs or other devices.
• The phase central wire coming from the “panelboard” is incoming (main) and is fed directly to the switch to the desired terminal. Blue wires from different groups The bulbs are not connected together, but run as separate wires to the output terminals of the switch.

In total, the box should contain the following items:

• 1 main phase wire.
• 1 output for the first light bulb or group.
• 1 exit to the second group.
• 1 wire “zero” combined with all light bulbs (twisted).

Considering all the nuances of the connection according to the diagram, it is noticeable that the phase wire plays a key role in the process of turning on and off groups of light bulbs from the power supply. Zero – serves as an addition.

Recommendation: When twisting the cores together, their ends must be thoroughly cleaned of insulation and no less than 4-5 cm long. It is advisable to clamp the wires with pliers in such a way that a braid is formed. The exposed area must be wrapped with insulation or a protective cap must be put on.

Advice: To reduce waste on the conductivity of wires from the box to the switch, you can use one three-core wire, the wires of which serve as phase distributors.

Connection diagram for one light bulb

This method is much easier to connect the necessary lighting fixture and is almost similar to the previous version. In an example it looks like this:

• A two-core cable is connected from the “shield” to the distribution box.
• An identical cable runs from the light bulb.
• Wires with a zero value are connected together and insulated.
• The main phase wire is connected to the appropriate input of the switch (terminal block “L”), and the output wire to one of the two lower terminals.

In this case, one of the buttons of the two-button switch is inactive.

Connecting a switch with a light indicator

Some switches have transparent windows at the bottom, near which there is an LED. It is designed to make the switch visible in the room at night and visible to its operation from the main electrical supply system.

Connection process

• Two thin wires extend from the diode to connect them to the main power cores.
• One tap must be aligned with the main phase conductor and secured in the terminal block.
• The second tap can be attached to any tap phase.
• After this - bottom part The device keys will light up, which means the switch is fully functional.

Connection diagram for two-button switch

• Do not connect a household appliance when the power supply is turned on.
• All work must be carried out with working tools.
• The fully assembled switch must be of high quality.
• It is recommended to purchase a device with terminal blocks that allow you to secure the wires once. Switches with bolted cores can damage it, and full pressure reduces wear resistance and can cause sparking.
• During the connection process, cases often arise when it is necessary to resort to the process of twisting wires (series connection). In such cases, it is necessary to carefully clamp the connecting wires and wrap them with insulating material, and put a protective plastic cap on top of it. When faced with this problem and confusion with the connection diagram, it is better to contact a qualified specialist so as not to cut off the power to the entire apartment.

Conclusion

The most profitable option for a room is to install a two-key switch, because with its help you can turn on the light in required quantity(brightness adjustment) and in the corresponding rooms. The main thing is to install the switch correctly, following safety precautions, and it will last for many years, without additional intervention or repair.

Today, every person is familiar with electricity and the laws of electrical engineering. Everyone knows about such a simple device as a switch. During the day, a person uses a switch more than a fork or spoon - in public places, at work or at home. For those who do their own repairs, it will be interesting to get to know this device better.

It is worth finding out what it consists of and what varieties it comes in. It is also worth understanding the principle of operation and the diagram of a double switch, which is connected to the electrical network. A switch with two keys is a device that lies between the elementary and the most complex.

Purpose of the device

Today in stores you can find a considerable variety of electrical switches: button, chain, slider, remote switches, dimmers, cord or timers. However classic version still remains rocker switch. All devices have the same principle of operation: a working mechanism with two main positions - on and off. This mechanism performs two main functions - closing the electrical circuit and supplying voltage to the lighting object, opening the circuit and removing voltage from the lamp.

Connecting a light switch with two keys is often done in household electrical networks with voltage up to 1 thousand V. The purpose of its use is to turn lamps and chandeliers on and off. Two contact terminals at the output, to which two independent groups of lighting devices can be connected - an advantage of a two-button switch. Installing a two-key household switch is used in some cases.

Connecting a double light switch It will be very convenient if the rooms are located next to each other through the wall, for example, with a separate bathroom. In this case, it must be installed between the doors of both rooms on the partition wall. Each key will be responsible for turning on the lamp in a separate room.

And it would also be advisable to connect a two-phase device in a large office space where there may be spotlights or a chandelier with five or more arms. And also, it is not always necessary for all the bulbs in the chandelier to shine at once; sometimes a small amount of light will be enough. If a single-key switch is connected, pressing it lights up all the lamps at once. Why pay extra? You can change it to a two-phase switch. After all, each shining light bulb consumes 1 kilowatt, and you can easily calculate how much you will get in a month.

With a two-key switch, you can supply voltage, for example, to only two light bulbs. To do this, you only need to enable one key, while the second one will remain disabled. You can save a lot of money on this, since all the other light bulbs will not light up. Another example when a double switch is used for two different light bulbs is in country houses. Most often it is installed in rooms that are located close to the exit to the street. One key will turn the light on street lamp, and the second is in the corridor.

Operating principle

The switch with two keys has a fairly simple structure. Its main part includes a working mechanism, which is installed in the socket box. Fixation in the installation box can happen in two ways, it will depend on the switch model:

• Using spacer feet.
• With the help metal frame. In which there are specially designed holes for fastening.

The main part of the working mechanism includes three contacts:

• One incoming contact has a wire connection to the power source.
• Two outgoing contacts from which wires extend to two groups of lighting fixtures. Or it could be two different rooms.

These contacts are fixed. And the connection between them is maintained using movable contacts, which are also located in the working part. The switch may also have protection, which consists of two keys and a frame and is made of plastic. In this case, the key is connected to one drive mechanism. When pressed, the incoming and outgoing contacts will close. This will supply voltage to one group of lamps. In order to avoid the possibility of touching the working part of the switch with your hand, it is necessary to place a frame made of dielectric material on top. It can be secured with two screws or latches.

Summarizing all this, you can understand operating principle of the switch. A wire runs from the junction box to the incoming fixed contact of the switch. It will supply voltage from the power source. By pressing the key, the fixed contacts are closed with the help of the moving one. From the resulting closed chain, voltage will flow to one group of the lighting fixture, and the light bulbs in it will light up. Using a similar scheme, the second group of lamps is brought into operation; you just need to press another key.

Exactly the opposite happens when a reversible process occurs. When you press a key in reverse side The moving contact first breaks the circuit between the fixed contacts. In this case, the lamps on the luminaires will not light, since voltage can no longer flow through the broken circuit.

Types of switches

Before you begin directly connecting the switch, you need to clearly determine which device is needed. They come in two designs- external and internal installation. You may not immediately understand the difference, since both devices have two keys. In order to understand how they differ, it is necessary to understand this in more detail. Differences can occur in several ways:

• By appearance electrical wiring.
• By installation method.
• By area of ​​application.

Required tools and materials

Required set of tools and materials, which must be assembled to begin installation:

How to connect a double switch? Below is indicated simple circuit double switch connections:

Indoor installation

Internal switch is the most common in modern society. Most often it is used in office buildings and residential premises. It can also be called “recessed”, since it is mounted directly into the wall. The connection diagram for a two-button switch with internal installation provides for the use of hidden electrical wiring. In this case, the wires are laid inside frame plasterboard walls or in special grooves that are made in the wall (grooves).

A device of this type requires additional installation of a socket box in the form of a mounting box. A socket box is inserted into the holes in the walls along which the grooves with wires are laid. The working part of the device will be located in it. Socket boxes can be found in two types: for concrete and plasterboard walls. You can easily imagine how much dust and dirt will end up in the apartment after installing this switch. Using a grinder, holes are cut in the wall for wires and for installing socket boxes. It is best to install an internal switch and hidden wiring combine with general renovation work on the premises.

Outdoor installation

To disconnect an external device, you will need open wiring. In this case electrical wires will stretch directly along the walls. Most often they are placed in plastic or flexible corrugated pipes. But they can also be suitable metal pipes, boxes or plastic cable channels. One of the outdated methods is to lay wires directly along the walls using porcelain insulators. Despite the fact that this option has long become obsolete and is not particularly popular, now you can encounter situations where it is not possible to hide the wiring inside the wall.

Most often, a switch for two lamps is used in the country, since such houses are made mainly of wood. The same method is convenient to use in basements, garages, cellars, sheds or outbuildings. This type of outdoor design can also be found in production or utility rooms. The beauty of the external switch is much inferior to the internal device. When the wires do not hang on the walls, but are hidden in them, the room becomes cozy and beautiful view. However, the external type of switch wins in terms of installation scheme - its installation is quite simple and quick.

As a temporary option, it is best to use open wiring and a switch with outdoor installation. This is suitable for non-residential premises or for a new house or apartment. This method can be used if you need some lighting to get started. renovation work.

The choice of electrical products on the current market is quite large and can leave you confused. For the right choice best get acquainted with the main characteristics. All models are created for the operating current, mainly 4A, 6A and 10A. For a chandelier that will have a large number of lamps, it is best to select devices with an operating current of 10A.

Wires with a cross-section of 1.5 to 2.5 mm² are usually used to connect the switching device to the power supply network. In most cases, it is better to use screw terminals to connect wires to the switch terminals. To date modern models Almost all are equipped with spring-loaded terminal blocks. This makes it easier and quick installation. To do this, you just need to insert the protected tip into the clamping device. It is best to choose this option when purchasing.

Nowadays the market is filled with a huge number of different models. You can choose one for every taste and color. In order to test the switch right in the store, you need to click the keys. They should work properly and lock clearly, producing a characteristic click. You can also ask the store consultant what mechanism the keys operate on. It can be rocker or cam. But also don’t forget about the base of the switch. It can be of two types: ceramic and metal. It is preferable to choose a ceramic base; it is safer due to its low thermal conductivity.

Now many manufacturers they are trying to make modern models with backlighting. This option is very suitable for the dark, since the luminous elements can easily determine the location of the devices. It is best to buy materials for installing the switch and the switch itself in electrical goods stores. There is a wider range and there are sales consultants who can easily tell you the characteristics and technical capabilities of different models.