How to connect a double switch for two light bulbs: change the single-key device to a two-key one. Connecting a light switch with two keys: installation details Show the connection diagram for a two-key switch
Light switches are one of the most common electrical installation products. Every apartment, house, office has at least a few of them. To save space and reduce the amount of work, switches can have not one key, but two or even three. But double ones are still more popular. That’s why we’ll talk further about dual (with two buttons) switches. They are also called two-key, two-button, double, etc. Connecting a double switch is quite possible for a novice electrician. Even without special skills, you can handle this yourself.
If you need to connect two light bulbs or two groups of lamps, and it is necessary for them to turn on independently of each other, you need a two-key switch. They are very easy to distinguish - two buttons are installed in one housing. By the way, the presence or absence of backlight does not affect the connection in any way. Neither the schemes nor the principles change.
The circuit of a two-key switch is simple: these are two normally open contacts, each of which is controlled by its own button. This means that in the initial state no current flows through the switch, since the contacts are open. By pressing the key, we close the contacts, the lights light up. This is the operating principle of any switch. The two-key one differs only in that it has two groups of contacts.
If you look at the design of a two-button switch, we see that it has one input and two outputs. The phase is connected to the input of the switch, and the wires that go to the light bulbs/chandelier are connected to the output.
Safety precautions - be careful
Connecting a double switch yourself is not difficult. You can cope even without special knowledge and skills. But you have to be extremely careful - it's still electricity. We must follow safety precautions. Things to remember:
The easiest way to check is to use an indicator screwdriver. If you touch a live wire with it, the signal light on it will light up. This is how the phase is determined. If the light does not light, it is the neutral or the wires coming from the light bulbs/chandelier. Only after understanding all the wires can you begin to connect the two-key switch.
Connection diagrams for a two-key switch
When connecting the switch, remember that the phase that comes from the panel is supplied to its input. This is the basic rule. This is the only way the connection will be correct. The phase is taken from the distribution box, which is usually located above the switch (sometimes, when bottom wiring- under it) in the junction box.
Please note that work is carried out with the voltage turned off. If there is a circuit breaker through which the lighting is powered, turn it off. If the wiring is old, unscrew the plugs. Before work, make sure that there is no voltage on the wires (touch all with an indicator screwdriver).
To two light bulbs
Most often, two loads are connected to a two-key switch - one light bulb or a group of lamps. In any case, the scheme will be the same.
A phase wire is connected to the input of the switch. The contact at the top of the switch is loosened (turn the bolt a couple of turns counterclockwise), the wire stripped of insulation is inserted along the plate (stripping 4-6 mm), the mounting screw is tightened. When tightening the bolt, apply considerable force. You can check whether the wire is securely fastened by tugging it well a couple of times. If you can’t get it, everything is fine.
In the same way, connect two wires that were sewn from light bulbs/chandeliers. The contacts to which you need to connect are located below. The principle is the same - loosen the screw, insert the wire, tighten it, pull it.
It doesn’t matter where to connect which wire (to the right or left contact). It just depends on which key will turn on which light bulb. If desired, they can be swapped later.
After the connection is completed, install the keys, turn on the power, and check the operation of the switch. If everything is done correctly, there should be no problems.
In addition to just switches with two keys, there are blocks with a socket. In this case, the connection of the double switch does not change, but a zero and grounding must be added to the socket.
So, we supply a phase to the block of switches, and from the output of the switches the phase goes to the light bulbs. We supply a phase to the socket block (you can take it from the entrance to the switch block), set “zero” to the second contact - from the corresponding bus on the panel. We connect the ground to a special ground contact.
What to do if there are more wires
In the double switch connection diagram described above, three wires are needed - a phase from the distribution cabinet and two wires from the light bulbs. But sometimes four or more come. What to do then?
- Find the phase and mark it. It is advisable to bend it so as not to touch it in the future.
- Find two wires that go to the light bulbs. This can be done using dialing mode.
- The remaining wire is most likely ground. According to the new standard, it is required even when connecting light bulbs. If you have a ground wire on your chandelier/light bulbs and it is connected to the switch, then we simply twist both wires. If the light bulbs or chandelier do not have an “earth” wire, simply insulate the wire and leave it. There is no need to cut it off - maybe later buy a chandelier with an “earth” wire.
The specified algorithm has weakness— we assumed that the remaining wire is ground. Logically, this is correct. But, unfortunately, there are exceptions. Therefore, before manipulation, you should decide whether this is really “earth” in front of you. To do this, you can measure the voltage using a multimeter (set the measurement limit to 1000 V - just in case, then you can reduce it). We touch the phase one with one probe, and the nameless one with the second. If it shows 220 V or a figure close to it, this means “zero” and not “ground”. If the readings are lower than 220 V, this is “ground”.
This “measuring device” can determine the “zero” or “ground” of your unknown wire
If you don’t have a multimeter, you can use a light bulb to which you connect two wires (you can take table lamp, wrap two wires around the plug). Take single-core wires, rigid, of sufficient diameter. Their ends need to be cleaned, but you will only hold on to the insulation. We touch the phase wire with one end, and the “unknown” wire with the other. If it’s on, it’s “zero”; if it’s off and the machine is knocked out, it’s “zero.” This method is dangerous to health, so we act very carefully.
If the connection is incorrect
If you decide to replace the old switch with a new one, and not a phase, but a zero is connected to the old one, this is wrong and you need to fix everything urgently. The light bulbs will work, but with this connection they are always energized. In this case, even replacing a burnt-out lamp is a deadly undertaking. I'm not kidding. This is true. Therefore, if the switch is connected incorrectly (if zero comes to it), everything must be corrected. There are two options here:
If you are connecting a double switch with your own hands for the first time, it is better to double-check your actions several times and work very carefully.
Switch installation
Finally, let's talk about how to install switches. It doesn’t matter how many keys they are. The sequence of work is the same:
- From the junction box, lower vertically downwards (or upwards with lower wiring).
- At the selected height, a hole is made in the wall for the socket box. Typically, a drill attachment is used - a crown.
- A socket box is installed in the hole. The voids between the socket box and the wall are filled with a solution, preferably with good adhesion to concrete and plastic.
- A small diameter corrugated hose is laid from the distribution box to the entrance to the socket box. Wires are then passed into it. With this installation method, it is always possible to replace damaged wiring.
- The switch is disassembled (the keys and decorative frame are removed) and the wires are connected.
- Installed in the socket box, secured with spacer tabs, tightening the fixing bolts.
- Install the frame, then the keys.
This completes the installation and connection of the double switch. You can check your work.
How to connect two light bulbs to double switch?
What is a double switch and where is it used?
Double switch is used to control two electrical appliances one device or to turn two groups on and off on one household appliance.
Often, such switches are used to turn on different sections of multi-lamp chandeliers - the switch keys are responsible for different groups of light bulbs in the chandelier, and when both buttons are pressed, all the light bulbs in the chandelier light up.
Before installing the switch, it is necessary to carry out the following preparatory work:
- purchase a switch that suits your requirements;
- study the features of the location of contacts;
- prepare the work site and necessary tools;
- carefully adhere to safety rules.
Two-key switch device
All two-button switches are three-pin - they have one input and two outputs. The wire with the phase must be connected to the common input, and the terminals turn on and off different sections in household appliances.
During installation, the switch is positioned so that the input contact is at the bottom, and the terminals intended for connecting the lighting device are at the top. Since such a switch is three-pin, there are also three clamps for the wires.
Why should a phase be broken by a switch?
Whatever the design of the electrical appliance, the phase must be interrupted by a switch. This is necessary to de-energize electrical appliances.
Thus, during repair maintenance of the device (for example, when replacing a burnt out light bulb), safety is ensured when the machine is turned on.
Double switch connection diagram
Before installing the switch, you must turn off the electrical current at the distribution panel and make sure that there is no voltage on the wires. From the electrical panel to junction box There are blue and red wires, responsible for zero and phase, respectively.
To connect a double switch, you need to connect the neutral wires of the lamps and the electrical panel, and connect the wire that is connected to the common contact of the switch to the phase wire of the electrical panel.
Thus, a blue wire (phase of the first lamp) and a yellow wire (phase of the second lamp) come out of the switch. Each of them is connected to the corresponding phase wires of each lamp.
In the distribution box they are connected to the required light bulbs or fixtures. That is, these wires are switched phases of different groups of electrical devices.
The blue wire (neutral) that goes to the electrical appliance is connected to the blue wire (neutral) on the distribution board. The switch connects the phases of the two sections of the lamp.
After making all the connections, you need to check the correctness of the work done. If everything is done correctly, then you can move on to soldering and insulation.
Connection features or how to avoid mistakes
When connecting wires of the same color, you can use screw connectors, which are easy to use and very reliable. It is important to use this connection when using copper and aluminum wires simultaneously.
After all, by connecting such wires directly, oxidation often occurs, the contact becomes loose and can cause heating of the wire, which in turn can lead to burnout and fire.
What is a pass-through switch and where is it used?
A switch that turns electrical appliances off and on from two different places, is called passing. They are used for rational use electricity. For example, in long corridor It is convenient to turn on the light at one end and turn it off at the other.
The pass-through type switch has three contacts for the supplied wires. To be able to control electrical appliances from several places, it is necessary to use four-pin or six-pin cross-type switches.
Connection diagram pass-through switch
A double transfer switch has two groups of contacts independent from each other. To connect such a switch, you need to connect the neutral wire of the electrical panel with the neutral wire of the distribution box, and then connect this box to the lamp.
This action must be performed for the first and second switch. After this, you need to connect the switched contacts of both switches. Then a cable is taken out from each switch, the lamps are mounted and connected in parallel to each other.
When this work is completed, you can proceed to installing the junction box. The cable coming from the lamp and the wires from the switches and electrical panel are inserted into it. To choose the location of the junction box, you need to find a place so that it does not interfere with anyone and requires short wires.
After completing the work, you need to do a check - flip the switch and see if it sparks or not.
Device check protective shutdown to be triggered
The RCD performs an important function - in the event of an electric current leak, it cuts off the voltage. Therefore, you need to systematically check the device for operation.
You can perform the check in several ways:
If the residual current device does not work, this indicates a malfunction or a breakdown of one of its internal parts. A special case is the breakdown of the mechanism for simulating current leakage. In this case, the residual current device functions and copes with its task.
How to connect a double switch for two light bulbs?
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Wiring diagram for a double switch for two light bulbs
Double switch connection diagram
A two-key switch is designed to turn on and off two electrical appliances from one place or control individual sections of one device.
Most often, such switches are used to turn on chandelier lamps: each of the two keys turns on one of the two groups of lamps, and when both keys are turned on, the entire chandelier is turned on.
Each group may have different quantities light bulbs - it can be either one or ten or more lamps. But a two-key switch can only control two groups of lamps.
Most two-button switches are installed in corridors near entrance doors private houses. In this case, one of the keys turns on the light in the corridor, and the other on the street.
In apartments, two-key switches are often installed to turn on the lights in separate bathroom– bathroom and toilet. In general, there is a large number of options for using two-key switches, but the circuit for switching them on is the same in any case.
It differs little from the connection diagram for a single-key one. At its core, a two-key switch consists of two single-key switches installed in one housing.
So, before starting installation, you need to select and purchase a two-key switch in accordance with color, design and other requirements.
Before installation, you should carefully familiarize yourself with the location of the switch contacts. Sometimes you can find the switch contact diagram on the back of the switches. where the normally open contacts are shown in the off position and the common terminal.
A double switch has three contacts - general input and two separate outputs. A phase from the distribution box is connected to the input, and two outputs control the switching on of groups of chandelier lamps or other light sources.
As a rule, the switch must be mounted so that general contact was located below.
If the circuit is on back side there is no switch, the contacts are determined as follows: the input contact is on one side of the switch, and the two terminals to which the lighting devices are connected are on the other side.
Accordingly, the two-key switch has three terminals for connecting wires - one on the input contact, and one on each of the two output contacts.
So, we figured out how the switch works. Now we need to prepare workplace, tools and materials. We must not forget that the most important thing when performing any work related to electricity is safety.
Regardless of the design of the lighting device, the switch in the alternating current circuit must break the phase wire. Thus, when the switch is turned off, electrical appliances are de-energized, which can then be safely serviced, for example, replacing a burnt-out light bulb in a chandelier.
The neutral wire from the junction box is connected directly to the controlled electrical appliance.
Each of the keys of a two-key switch can be set to one of two positions, turning the electrical appliance on or off.
Connection diagram for two-button switch
Before starting installation, be sure to turn off the voltage at the distribution board and make sure that there is no voltage on all wires.
Two wires come into the distribution box from the electrical panel - phase (red) and neutral ( of blue color).
Connection diagram for two-button switch assembled in the following sequence: neutral wires from the electrical panel, lamp No. 1 and lamp No. 2 are immediately connected to each other. The phase wire that came from the electrical panel is connected to the wire that goes to the common contact of the two-key switch.
Connecting a two-key pass-through switch
Single-gang switches are being used less and less in modern apartments with three- or five-lamp chandeliers. We suggest you consider how to connect a two-key illuminated switch with a socket, also a photo and diagram in our article.
Switch types
There are two ways to connect wires to a light switch: screw terminals and self-clamping terminals. In the first case, the cables are placed in a special block and secured with a screw. The only drawback of this connection is that over time the screws become loose and need tightening. Those. A mini-circuit can occur at any moment.
Large manufacturers use the second option to create their products. It is considered more expensive, but also more effective. In addition, in Lately modular technology has become increasingly used.
Diagram: example of connecting a two-key switch
How to connect a switch
Below we have presented a diagram of the operation of the switch and its installation. A two-key Euro switch is two single devices, but in one housing. Their phases are combined, and at the moment when one bridges its contacts (and it begins to supply power to its group of devices), the second breaks the circuit and stops receiving signals from the phase cable from the outlet or wiring in the apartment. This happens because the ground wire and phase neutral are connected directly to the lamp, and the phase passes through the switch.
Connection diagram for a two-key switch to a chandelier
To work you will need:
First we turn off the electricity. Next, you need to prepare the wires in the installation box; to do this, we clean them with pliers. It is necessary to leave approximately 10 centimeters of wire; cut off the excess with a stationery knife. Now you can connect the wiring and switch wires. If the wiring is three-phase, then this process will not be particularly difficult.6 We simply connect the cables corresponding in color to 3 phases and zero.
If the wiring is two-phase, then you need to fasten the wires of the switch with a terminal, and eventually getting two jokes instead of three, connect them to the power supply of the electrical network.
Install the protection plates and turn on the power. Ideally, both switches should be in the up or down position when the light is off. If necessary, remove the second electric switch, rotate it 180 degrees in the box, then set it as two toggle positions.
Video: How to connect a two-key switch
Connecting a chandelier is also no more difficult. Certain lamps are combined into groups, and if there can be only two groups, then there can be any number of lamps: with two arms, five or even six.
Switch installation
The main difficulty is not connecting the wires to two independent lamps. And in installing a switch in a junction box. Imported switches (simon, wessen, lezard, schneider electric, anam, legrand-legrand, valena).
You need to use a screwdriver to secure the switch directly in the installation hole and tighten it with screws or bolts (which are most often included in the kit). Then we install the box with the keys on it, press it and secure it (if necessary), with bolts on top.
A very interesting practice - installing a switch with an indication hidden installation. This type of electrical appliance is popular in a “smart” home and apartment, where design and style play a big role. Its installation is carried out in a recess in the wall, from the junction box to the wiring cables, everything is completely similar normal installation, but at the final stage you need to attach a special closing lid (sometimes sensors with a flip flap are used).
Let's consider the installation process if there are two electricity networks. We combine one network into one group, the second into another. Now we connect the cables accordingly. One wire should close when the other opens, so check the connections carefully.
One switch for two lamps
As already mentioned, the devices control two groups of lamps, which means you can install the bathroom and corridor on a two-key switch. To do this, we bring the wires from both lamps to the wires and the location of the switch, we combine each of them into separate groups, connect with terminals and attach to the switch. For large premises We recommend reading the article on how to connect a pass-through two-key switch.
Installing a light switch for two rooms is done in the same way.
- combine groups thoughtfully (for example, kitchen-toilet, corridor-bath, living room-room, etc.) then there will be no cable overuse
- install switches within easy reach: not behind a chair or cabinet
- a more powerful switch must be connected to the lamp and fan, taking into account that in addition to the main cables, there is a wire responsible for powering the fan itself
- We recommend using switches with simon indication
- In order to connect the device correctly, you must review the wiring layout, especially when connecting to two power sources
- If you have not had such experience before, we recommend that you first watch a video of how to install the switch.
How to connect a two-key switch. Connection diagram
Many of us have a question: How to connect a two-key switch yourself? - the question is simple, you just need to understand a little about the method of such connection. Let us first consider more simple circuits with connection of a light switch with two keys. The method of connecting a two-key light switch is generally no different from connecting a switch with one key.
The advantage in installing and connecting a two-key switch is that with such electrical diagrams ah, using a two-key switch, you can sort of control the lighting.
Connection diagram for two-button switch
A clear example of such a choice of lighting is presented in the electrical diagram of Fig. 1, when in the electrical circuit of the lamp. either one lamp or the other turns on, or all two lamps turn on. The switch here is also connected in the electrical circuit in series on the phase wire. The lamps in the chandelier are connected in parallel to #8212 an external source of electrical energy.
Connection chandeliers-to double switch
When connecting a chandelier with three lamps to a two-key light switch, Fig. 2, the neutral wire in this connection diagram is common to two groups of lamps, that is, the choice of chandelier lighting has a connection:
Connecting two chandeliers
The connection of a two-button light switch in this circuit, with the connection of two lamps, #8212 is typical as for other electrical circuits presented. The circuit can be imagined as connecting two chandeliers controlled via a two-key switch (Fig. 3).
How to connect a chandelier with 6 lamps
Connecting a chandelier with six lamps through a two-key light switch (Fig. 4) indicates how to connect lamps in this way. Everything is just as simple here. Wires L1 and L2 from the switch have a branching, like the neutral wire, into two groups of lamp lamps.
Installation and subsequent connection of a two-button light switch for similar type lamp - does not require detailed explanation. The choice of lighting from a two-key switch is carried out as follows by turning on the lamps, where the following is included in the electrical circuit:
How to disassemble a two-key light switch
Disassembling a two-key switch is initially carried out by removing two keys, followed by disassembly.
How to connect a two-key switch
The photograph below clearly shows the method of connecting wires to the screw contacts of a two-key switch.
A wire with phase potential is connected to one screw contact of a two-gang switch. The other two wires supplied to the load are separately connected to the contacts from the two switch keys, as shown in the presented electrical diagrams.
How to install and connect a light switch
From time to time, every person who actively uses lighting in the house needs to replace a switch that has failed or is out of fashion. This can't always be done qualified specialist– master electrician, so know the basics self-installation necessary for your own peace of mind. It is important to know how to install a light switch so that the work you do yourself is of high quality.
Switch: history and evolution
The switches we are familiar with today appeared in the late 1870s, thanks to the invention of Edison. A few years later, in 1893, the prototype of modern switch– a switch with a spring mechanism and an automatic switch. At the beginning of the twentieth century, switches began to slowly take on their usual form. In the late 40s and early 50s of the XX century, single-key products began to appear, and later it became possible to purchase options with 2-3 keys. Today, this element of the home electrical network is equipped with lighting, has various shapes and it no longer seems like something unusual.
Selecting a dimmer: one or two keys?
The convenience of controlling light in a room depends on many factors:
- own taste
- room layout
- lighting intensity.
One- and two-key on/off elements are optimal solution for domestic purposes, since they cope well with the load, but will not withstand if you have to work with powerful professional lighting devices - this is important to take into account.
They are suitable for working with both old incandescent light bulbs and new, modern inventions - fluorescent lighting fixtures or diode lamps, ribbons.
The number of keys directly depends on the tasks assigned to the product - for example, to turn on the light in a separate bathroom, it is better to purchase an element with two keys in order to save energy. IN small spaces A single-key option is ideal.
Tricks for choosing a lighting controller: connection without problems
Before proceeding with the connection, it is important to know the tricks of choice. Today there are many models that allow you to control the level of lighting in rooms. If the choice fell on rheostatic models, then it is important to remember that they allow you to select the level of light and smoothly adjust the brightness of the light bulb. At the same time, this option is the most profitable, but it is suitable only for the simplest incandescent lamps and, having installed such a light controller, you will have to use it exclusively all the time.
The body must be made of durable and necessarily fire-resistant plastic. The internal base can be made of ceramic. If the backlight is installed, which is very often used in modern models, then you must remember that such a switch is energized all the time.
How to correctly install control elements: determining the amount of light, preparatory work, connection and tools
Before you begin installation, you need to decide where the switches will be located, since the convenience of controlling the light in the room depends on this. The connection itself is not complicated, so the desired amount of light is easy to achieve. After this, it is important to check that you have all the tools necessary for the job:
- switch/s
- junction box
- wires for connection
- insulating tape.
Installation work: methods for installing light connection elements
There are several ways to properly connect light controllers. All of them are not complicated, do not require a lot of time and effort, but some knowledge in this matter is required so that later the light sources will please the eye and can meet the needs of people.
Sometimes it is necessary to turn on/off the lights in rooms from different places, especially if the room is large. For this purpose, different lamps are usually installed. For example, a person will want to control the lighting in a room from the hallway and, in fact, from the room itself; there are 4 - 5 light bulbs in the chandelier; this is why you need to know how to connect the light through a switch in order to play with the lighting at your own request.
Essentially, it is necessary to make it possible to control different groups of light bulbs in a chandelier, for example, in a combination of 1, 2, 5-4-5 pieces at the same time.
In order to change the number of light bulbs in a group, you need to know how to connect a light switch.
Connection diagram
To make the connection, you will need the controls themselves - single or double - depending on the needs and desires of the people doing the repairs. It is more convenient to use two-key pass-through switches if we are talking about a hallway.
This is what it looks like disassembled, ready for installation:
A double or, as it is also called, a two-key lighting control element always has six contacts - respectively, two inputs and four outputs. The connection is made based on these features.
The connection diagram looks like this:
In essence, these are two single elements connected in one reliable housing. Here you can see how to connect a double light switch so that further operation is as safe as possible for humans, convenient and practical.
The scheme, designed to control lighting simultaneously from three places in the room, is not much different from the previous one. The difference is that it includes another double-type element - cross, which differs from single and double ones, since it has four contacts, and not six, as before - two inputs and two outputs, respectively. When you press the double paired switch, two contacts independent of each other are immediately switched.
It is important to note that the total number of lighting control points from one switch installed in a room is not limited to two or three, it can easily reach five or six. This is carried out in the following way— the switch is used as a single switch with three contacts, in conjunction with it, another one with four contacts is installed.
Getting started on creating the perfect indoor light
It is necessary to check the availability of all tools in advance so that the connection goes smoothly, since then leaving an unfinished control element will be simply dangerous. After this, you should check whether the wiring and lighting installed in the room are working properly.
Single-key version of the built-in type, usually installed in the corridor or hallway. This is what the one- and two-key options look like:
With the help of these developments it is convenient to create ideal lighting in the corridor.
The connection diagram for a single-key switch is the simplest, since there are only 2 wires per switch. You can connect a light switch to one light bulb from the apartment electrical panel, here the phase is a red wire, the zero is a blue wire. The voltage comes to the distribution box, which is located in the corridor.
The phase is connected in the distribution box to a red wire, which goes directly to the switch. From it, the wire, indicated in orange in the diagram, goes back to the junction box, where it is also connected to the wire orange color, going to the lighting device, which is also a load in this circuit.
Zero, in turn, is connected in the junction box to a wire marked in blue, which immediately goes to the light bulb. It is convenient to use terminals to connect wires in the junction box - with them the connection will be faster and more reliable.
Important to remember. The switch should always break the phase, but not zero.
When replacing a lamp, it will be enough to turn off just the switch, and there will be voltage in the cartridge. If you mix up and break the zero, then when you replace the lamp, it will remain energized in any case. This happens if the switch is equipped with an LED, which always glows in the dark. In this case, the connection of new elements will occur under voltage.
Nuances of work: connecting light
There are two types of installation - with open and closed wiring. In the event that we are talking about installation with open wiring, then the socket box, which is installed in the wall, will come to the rescue. The selected switch is already attached to it according to the above diagram.
Fastenings are made with screws, dowels or self-tapping screws - the choice of fasteners depends on the wall material and the type of switch. The holes into which the switch will later be screwed are drilled in advance using a drill. After connecting the wires, an insulating cover is applied and screwed using special hooks. The key that will be used to regulate the amount of light in the room is placed last. As you can see, connecting the light is an accessible matter for most people; you just need to carefully study the instructions and follow the diagram.
This is what the socket boxes look like:
So - disassembled switches, ready for installation
In the video you can watch the entire work process and clearly see all the features that can await a person during installation:
You can install the switch yourself, even without having special education. Difficulties can only await those who are afraid to work under pressure, as they will have to overcome their fear. Otherwise, today there are detailed manuals and video tutorials that allow you to do any work yourself, without resorting to the help of craftsmen, who sometimes have to wait for several days. However, if a person feels insecure or afraid, it is better not to take risks or experiment, but to use the services of a specialist - it is safer and more reliable. Thus, the connection will not take much effort, time and nerves.
Simple useful tips
Easy and Strong Wood Glue: You can make your own wood glue. It is enough to take a little cottage cheese and dissolve it in ammonia. For 100g. ammonia, 25g. cottage cheese. Wooden surfaces must be carefully adjusted to each other so that there are no gaps, smeared and tightly secured with clamps.
Switch on the vacuum cleaner tube: Some modern vacuum cleaners are equipped with a switch on the hose. It is very comfortable. But if your vacuum cleaner doesn’t have such a switch, it doesn’t matter. You can do it yourself. You need to connect the socket to the body of the vacuum cleaner, and attach the cord with a plug and switch to the hose with adhesive tape.
Connecting a two-key switch to two light bulbs is quite simple, the main thing is to accurately observe the order of all connections. The two-key switch has terminals for a three-wire wire, while the light bulbs require a regular two-wire cable. When using a standard junction box, it will easily accommodate the necessary connection assembly that will be required for this connection.
Connection diagram
If you have two lamps in different rooms or one chandelier with two bulbs, it will be convenient to use a double switch. Such a switch has three contacts and two jumpers, which are controlled by keys. Another necessary element is a power supply with a two-wire cable, one wire (usually blue) is connected to neutral, and the second (brown or gray) to phase.
A simple and clear schematic representation of the sequence of arrangement of all cores relative to each other can be seen below.
Pay attention to the position of the vertical jumpers on the switch (black square below). These are the jumpers that this moment are in the off state. As soon as one of the keys is pressed, it will move the jumper to a position in which it is connected simultaneously to both phase and zero, which closes the circuit and supplies current to one of the bulbs.
Similarly, when you turn on the second key of the switch, the jumper will connect to the phase another circuit in which the second light bulb is located, and it will also begin to light.
Naturally, both alternate and simultaneous activation will be available in such a connection. This circuit guarantees complete reliability of operation of the switch and light sources, subject to correct technique wiring installation, which is discussed in more detail in the next section.
In the meantime, for more advanced users in the field of electrical wiring installation, we attach a diagram compiled by another specialist with professional symbols all points and connections.
Here you can see an additional socket with a neutral wire included in the circuit. Her example clearly illustrates the method of connecting any other electrical appliance with grounding.
Wiring technology
First of all, let's decide on the wiring that goes separately to each of the connection participants. Let's start with the two-key switch. It has three terminals: one for a common cable and two separate ones. Therefore, to include it in the circuit you will need a three-core cable.
We connect a core with red insulation to the common wire. Below you can see a specially designed stand with a conventional arrangement of the future operating elements of this part of the electrical wiring.
There is a switch on the bottom, a source of electricity on top connected via a two-wire wire with a neutral and a phase, and on the left and right there are two light bulbs. All wires come together in the junction box - required element installation of proper wiring.
The first step is to clean each core of all wires from insulation. First we remove the white protective material, common to the internal cores of each cable, and then remove the insulation from all cores one by one.
Let's take a closer look at the functions of each core of the power cable wires, switches and light bulbs.
The power cable is located on top. On the left there is a brown wire going to the phase, and on the right there is a blue wire connected to zero. Further on the sides you can see the same wires of the light bulbs, in which the blue wire is also the neutral wire, and the brown wire is the phase wire. Here it is worth clarifying that the zero (blue wire) should go to the outer contact of the socket, which is in contact with the thread of the light bulb, and the phase (brown wire) should go to the inner one, which connects to the point in the center of the bottom of the light bulb.
On the switch, as previously mentioned, the red wire in the center goes to the common contact, and the green and gray wires on the sides are connected to the key jumpers.
Now you need to connect the red wire of the switch to the brown phase wire of the power source. We connect the blue neutral wire from the power cable simultaneously to the two blue wires of both light bulbs. And we twist the gray and green wires from the switch with the brown cables going to the phase of the light bulbs. As a result, we get approximately the following picture.
The final step is to tighten all connections securely with pliers and solder them. Then carefully insulate each twist and place it compactly in the junction box.
Content:
In a large room and a 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 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. The connection diagram for a two-key pass-through switch provides for 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 a different number of 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 speak 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 the neutral wire connected to the light bulbs. 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 ah, when connecting (sometimes the word disconnection is also used) of pass-through switches, it is used standard set tools and accessories:
- pliers;
- spanners(sometimes can be useful for some lamps);
- level;
- wire cutters;
- wire strippers or sharp knife;
- a screwdriver of a 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.
Self-execution electrical installation work allows you to save a lot of money and time. To perform such operations, you need to study their features, execution order, etc.
It is these issues that we will deal with in our article, considering the features of electrical installation work. The information is presented in the form step by step instructions, equipped detailed photos, which illustrate the step-by-step installation process.
And although the wiring diagram for a two-button switch for two light bulbs may seem complicated at first, once you understand the principle of operation of such a device, even a novice electrician can handle the installation.
A switch of this type is most often used for lighting in two adjacent rooms or for controlling a multi-arm chandelier. The first option is traditionally used for a separate bathroom or for lamps installed in different rooms.
If it is convenient to turn on both lighting devices from one point, it is more reasonable to install one device with two keys, rather than two identical single-key switches.
If you organize the control of a chandelier in this way, you can regulate the illumination of the room by turning on only some of the light bulbs or all at the same time. Such a scheme can also be useful in the kitchen, for example, to turn on the upper and lower lights.
Not too much to an experienced master It may not be easy to figure out the order of connecting a switch with two keys. But if you understand the principle and sequence of work, then there will be no problems.
Switch installation features
Let's assume that our task is to equip a new building with electrical wiring that has not yet been touched by an electrician. Let's consider the features of performing electrical installation work in stages.
Stage #1 - performing preparatory work
First you need to prepare the necessary tools and materials:
- single-pole circuit breaker and;
- switch with two keys;
- distribution box;
- two lamps;
- din - rail to install devices to protect wiring and owners;
- socket box suitable in size and type;
- electrical tape;
- perforated tape for cable installation;
- fasteners;
- screwdrivers, Phillips and flat, or a screwdriver with attachments;
- voltage indicator;
- knife, wire cutters, pliers, etc.
Start connecting with preparatory stage. First you need to install a distribution box in which all the wires will be collected and connected in accordance with the diagram.
To protect the circuit from breakdowns and overloads, you will need an automatic circuit breaker, and to protect the owners of the premises from shock in the event of a current leak, you will need an RCD. These devices must be installed in the distribution panel of a house or apartment, where suitable places are provided for them.
The double switch connection diagram will help you connect all the elements and wires correctly. Understanding the principles will greatly facilitate installation
If for some reason such installation is not possible, the RCD and the machine are installed on a mounting rail mounted directly on the wall. After this, you need to install a socket for the switch.
The socket box must be selected depending on the wall material: concrete or plasterboard. Devices for concrete are also used on other similar substrates: for brick, gas and foam concrete, expanded clay blocks, etc. A hole is made in the wall the right size, and then fix the box with gypsum or cement mortar.
Stage #2 - selection and installation of a suitable socket box
For work on plasterboard other models and installation methods are used. They are equipped with spacer elements that allow you to fix the device in the hole. The same socket boxes are used for installation on a wall covered with chipboard, plywood, etc.
Now you can start laying the wires. In accordance with the drawn up diagram, you need to make markings and lay grooves if hidden cable routing is planned.
When choosing a socket for a switch, you need to pay attention to this nuance. New models of such devices are made of plastic and have a diagonal of 67 mm. Old, usually metal, analogs are slightly larger, they have a diagonal of 70 mm. This small difference can make a difference.
Modern two-key switches fit perfectly into 67 mm socket boxes. You can fix the mechanism inside using spacer legs or screws.
In metal models, the three extra millimeters can make it very difficult to install the switch, since the spacer legs, which are usually located on the sides of the mechanism, may not be long enough to securely fasten it.
The internal insulation of a three-core wire differs in color for each core: for phase, neutral and ground. This label must be strictly observed.
One wire is intended for neutral, the second for grounding, and the third for phase. You need to remember what color wire is allocated for each function.
Carefully connect the ends before connecting. In this case, you need to make sure that the color markings on the wires connected to the machine match those that come out of it. If the neutral wire runs at the top right side, then it should also be on the right below.
Grounding for lighting devices is not always provided in standard apartment plans. In this case, the third wire remains unused.
If there is a ground loop, it should be connected to further protect the lighting from possible accidents. This circuit is connected to the corresponding contacts on lighting fixtures. Newer luminaire models usually have grounding pins.
This precaution when connecting a two-key switch to two light bulbs is required if the lighting is installed in a bathroom or other room with high humidity. Grounding conductors that have not been used should be insulated and laid so that they do not interfere with further installation work.
Stage #4 - installation and connection of the switch
Outside standard model switches consist of two keys and a decorative frame, although the design may vary. Behind them is the working mechanism. To open it, you need to remove the keys. To do this, pry each of them with a screwdriver and disconnect it. Some manufacturers make small protrusions on the edges of the keys to make disassembling the device easier.
After the keys are removed, you need to remove the decorative frame. To do this, unscrew the fasteners or open the latches. The device contacts may vary depending on the model. They are usually made screw or self-clamping. Now you can connect and install the switch.
After removing the outer layer of insulation, approximately 10 mm must be removed from each core insulating coating– . You should first study the design features of the device, paying attention to the type of contacts. The switch needs to be turned around and examined.
There is usually a diagram here that can help you make the connection correctly. If the device does not have such information, you need to look for it in the instructions or use devices to determine which contact is intended for the phase input, and which two are outputs.
The absence of the necessary markings is a rare case, typical for some old switch models from Soviet times or for cheap, low-quality devices made in China. Sometimes simple logic helps: the entrance and exit are almost always located on opposite sides. There is only one input, but there are always two outputs in such switches.
The input and output for the contacts are usually located on opposite sides. The phase input is indicated as L, and the connection of the output contacts is indicated by arrows
Typically, the letter L indicates the connection point for the input of the phase wire, and the arrows on the opposite side indicate the connection point for the wires responsible for the operation of a separate key.
The core, which is most often covered with white insulation, must be connected to the phase input, and the remaining two wires, which are blue and yellow-green in the photo, to the corresponding sockets. After all contacts are connected, you need to unfold the device and install it in the socket box.
In models with self-clamping contacts, connection is extremely simple. The stripped edge of the wire just needs to be inserted into the connection point. There is a clamp installed there that automatically secures the connection with a spring. All three wires are connected in this way.
Need to watch closely color coded separate veins. Once they are inserted into the connectors, you need to pull back a little to make sure that the connection is secure. If it is necessary to remove the fixed conductors from the clamping contacts, then the connection must be disconnected.
For this purpose, buttons are provided next to each clamp; they can be located at the ends of the device. When you press the button, the clamp opens and the wire can be easily removed. On switches with screw contact retainers, there is often no marking of input and output for wires.
Usually there is a phase input at the top, and two outputs at the bottom. The design of such devices includes a plate to which movable output contacts are attached; their purpose is obvious. To fix the contacts in such a device, you need to unscrew the clamping screw, insert the stripped edge of the wire into the hole, and then screw the fastener back.
If the grounding conductor is not used at this stage, it is recommended to take care of its insulation again. Now you need to clean the end of the phase wire leading to the lamp from the outer and inner covering. It needs to be connected to one of the wires that comes out of the switch.
You need to do the same with the phase wire that leads from the second lamp; it is connected to the second core coming out of the switch.
Again, any unused ground wires should be insulated and placed in the distribution box. If grounding is provided, the corresponding wires must be connected in series. It remains to connect the neutral wires: one from the power wire and two more from the lamps. They are simply twisted together.
Stage #6 - checking the functionality of the circuit
Now all that remains is to screw the light bulbs into the lamp sockets and check the operation of the circuit.
Once assembly is complete, the double switch connection diagram will look something like this. At this stage, you need to perform a check: turn on the RCD and the machine, and then the keys - alternately and together. After checking, the protection devices must be disabled
First you need to turn on the RCD and the machine. After this, check the operation of each switch key in turn, and then turn both lamps on and off simultaneously.
If everything is done correctly, the lamps will light up and go out in accordance with the position of the switch keys
After this you need to turn off protective devices and insulate all connection points and complete the installation of the two-gang switch by installing a decorative frame.
Conclusions and useful video on the topic
A visual process for installing a two-key switch can be seen here:
In fact, connecting such a device is not difficult, you just need to understand the order of all operations and comply with safety requirements. Better and easier to use modern devices and materials, since they are easier to install and fit together better.
Do you want to clarify some unclear points regarding the installation of a switch that we did not cover in sufficient detail in this article? Or would you like to supplement the above material with valuable comments/advice based on personal experience? Please write your questions in the comments block, express your opinion, and add useful recommendations.