How to quickly and easily connect a welding cable

To ensure that the power supply in your homes is always of high quality, uninterrupted and reliable, it is very important to correctly connect the wires during installation work. There are a lot of methods, we will consider each in detail separately with its advantages and disadvantages, with step-by-step instructions for performing switching. We will also pay attention to the eternal question of electricians - how to connect wires whose cores are made of different metals (for example, copper and aluminum).

Removing the insulating layer from the wires

I would like to immediately dwell on a question that will be common to any method. Before connecting the wires into a common electrical unit, they must be stripped of the top insulating layer.

This can be done using a mechanic's knife. This method is simple, but there is a high probability of damage to the conductor. To do everything correctly, you must strictly follow the step-by-step instructions:

1. Place the wire on some flat surface (such as a table).
2. Press it with your left index finger.
3. With your right hand, take the knife and lightly press it into the insulating sheath of the wire. To avoid snagging the metal core, position it towards the cut at an angle. If the angle is right, there is a possibility of a circular cut in the core, as a result of which it may subsequently break.
4. Hold the knife in this position. Using the index finger of your left hand, slowly twist the conductor one full turn, thus cutting the insulation around the entire circle.
5. All that remains is to pull off the cut piece of insulation.

Professional electricians now necessarily have in their arsenal such a device as a stripper. This is a multifunctional tool that can be used to strip insulation from a wire or cut a cable. It can be simple, semi-automatic or automatic. The most important thing is that when stripping the insulation with a stripper, the conductor is not damaged. For each standard core diameter, such a tool has a calibrated hole with a cutting edge.

The length to which wire cores need to be stripped is different for each connection method.

Twist

Let's start with the simplest and most well-known method - twisting. It can also be called the oldest; it’s not for nothing that electricians call twisting the “old-fashioned method.”

We will not tell you that such a connection of wires is durable and reliable. According to the main document in electrical engineering, PUE (“Rules for Electrical Installations”), twisting is generally prohibited, despite the fact that half a century ago it was used everywhere. The fact is that in those days the load in the apartments consisted only of lighting, radio or television. If you consider the current load in modern apartments with a huge amount of household appliances used daily, then no old insulation, core cross-sections and methods of connecting wires are any longer suitable.

Nevertheless, we will talk about twisting, and even first of all, because it is the main stage of such connection options as welding and soldering.

Positive sides

The most important advantage of twisting is that it requires absolutely no material costs. All you need is a knife to remove the insulating layer from the wire cores and pliers to make the connection.

The second indisputable advantage of twisting is its ease of execution. You don’t need any special knowledge or skills; it can be done by anyone who has ever held pliers in their hands.

Several wires can be connected simultaneously in a twist, but their total number should not exceed six.

Negative sides

The main disadvantage of twisting is its unreliability; it weakens over time. This is due to the fact that there is residual elastic deformation in the cable or wire cores. At the point of twisting, the contact resistance increases, which can lead to contact failure and heating. In the best case, you will detect this in time and re-seal the connection; in the worst case, a fire may occur.

Electrical wires made of different metals cannot be connected using twisting. As an exception, you can twist copper and aluminum wire, but only if the copper core is first tinned with solder.

In electrical engineering there are concepts of detachable or permanent connection. So twisting does not apply to one or the other. A detachable connection is characterized by the fact that its ends can be disconnected many times. This cannot be fully done in twisting; every time after the next unwinding and twisting of the cores, they will deteriorate. It is also impossible to call twisting a permanent connection, because it does not contain the concepts of strength, reliability and stability necessary for this. This is another disadvantage of the twist connection.

Installation

If for some reason you do not have the opportunity to use other methods of connecting electrical wires, you can use twisting, just do it well. Very often it is used as a temporary option and is subsequently replaced by more reliable switching methods.

How to connect wires using twist? To begin with, the cores are stripped to 70-80 mm. The main thing is to twist all switched conductors into one single twist at the same time, and not wind one around the other.

Many people mistakenly begin to twist the wires together from the place where the insulating layer ends. But it is better in this place to clamp both wires with one pair of pliers, and with the other, grab the ends of the wires and perform rotational movements in a clockwise direction.

If the wire cross-section is small, you can twist it by hand. Align the conductors along the cut of the insulation and hold them firmly in this place with your left hand. Bend all switchable ends into one single bend at an angle of 90 degrees (a bend length of 10-15 mm will be enough). Hold this bend with your right hand and rotate clockwise. This must be done firmly and firmly. If it is already difficult to twist your hands at the end, use pliers as described above. As soon as the twist becomes smooth and beautiful, you can trim the bend.

You can connect several wires this way, but then to make it easier to twist them, make the bend longer, somewhere around 20-30 mm.

How to properly twist wires is shown in this video:

There is also a way to twist wires using a screwdriver, see about it here:

For information on twisting wires using a special tool, see here:

Now the resulting twist must be carefully insulated. Electrical tape is used for this. Do not spare it, wind it in several layers, and insulate not only the connection itself, but also step 2-3 cm over the core insulation. This way, you will ensure the insulating reliability of the twist and protect the contact connection from moisture.

You can also insulate the connection of wires using heat pipes. The main thing is not to forget to put the tube on one of the cores to be connected in advance, and then push it into the place where it is twisted. When exposed to heat, the thermal tube shrinks, so slightly heat its edges and it will firmly grip the wire, thereby providing reliable insulation.

If the twisting is done well, there is a chance that it will serve you for many years, provided that the load current in the network is normal. But it’s still better not to stop at this stage and strengthen the joint by welding or soldering.

How to connect a welding cable to each other

The installation of power supply systems must ensure their safety and reliability. And the main vector of attention must be directed to the places where the wires are connected. An amateur approach to the matter saves minor money, but does not provide the required level of quality and safety of the system.

Only knowledge of the technical conditions and features of specific components makes it possible to provide the connections with the proper quality, and the user - confidence in the safety and durability of the electrical system of the room. Putting the technical point at the forefront, we will see that the most reliable and safe method of connecting electrical wiring is welding!

To carry out welding work you will need a welding machine and some skill. An overview of the devices is given below, and to acquire the skill you just need to read the article and practice a little.

Tools and materials required for work

To carry out wire welding work, the following devices, tools and materials are required:

• Welding machine
• Electrodes for welding wires
• Protective glasses
• Pliers and side cutters
• Flux for aluminum welding

Welding machine

A welding machine for working with electrical wires must be compact, have adjustable parameters and operate in the range: Current 30 - 90 Amperes (A) Voltage 12 - 36 Volts (V) Power consumption 1 - 1.5 Kilowatts (KW)

Use of alternating and direct current.

Welding machines are equipped with two power cables (twisting ground, electrode holder). The average price of the device is 7,000 rubles. Popular brands Don, TS 700 - 1, TS 700 - 2. There are many home-made designs using a step-down transformer, but we recommend certified ones.

You can rent a welding machine for a couple of days at building materials and tool stores.

Electrodes for welding wires

Electrodes for welding wires determine the quality and ease of operation. You will need graphite electrodes (aluminum welding) and copper-graphite electrodes (copper welding).

Using flux, graphite electrodes will weld aluminum strands up to 20 mm in diameter. Copper-coated graphite electrodes are designed for welding copper strands without the use of flux. Twist diameter up to 18 mm.

Popularly, these types of electrodes are called pencils. Before purchasing, consult with experienced electricians or store salespeople. Taking into account the model of your welder and the specifics of the connection, knowledgeable people will simplify the choice.

Protective means

Protective equipment is necessary when working on electrical installations! Pay attention to the insulation of the handles of pliers and wire cutters, the stability of the stepladder and the reliable fixation of safety glasses.

Hand tool

Pliers and side cutters will be needed to prepare the wires and twist them. Sometimes pliers are used as a ground terminal. Side cutters will help you make an even, flat end cut of the twist, which is very important for the quality of welding.

Connecting wires by welding forms a uniform fragment at the twisting point, the current conductivity of which is equal to the conductivity of the material itself. In practice, welding at the point of contact turns several wires into one. This eliminates oxidation of contact zones and heating of joints. An indicator of a high-quality welding joint is the formed metal drop at the end of the twist.

Welding aluminum wires

Aluminum wires have been used in construction for a long time and in the overwhelming majority. The soft pliability of aluminum tempts you to connect wires using the twisting method. As a result, the largest number of accidents and fires occur due to the unacceptably low quality of such connections.

The oxide film formed on the surface of an aluminum wire has high resistance, which leads to overheating of the wires at the contact points. According to the Electrical Installation Rules (PUE), connecting aluminum wires in this way is prohibited.

There are several acceptable methods, but all of them are inferior in reliability and safety to the welding method.

The main difficulties when welding aluminum are the rapid formation of an oxide film and the relatively low melting point. The use of fluxes prevents oxidation during operation, and the use of a welding machine in reduced power mode does not lead to wire fluidity due to overheating.

Before welding, you need to strip the wires of 50 - 70 mm of insulation and 20 -30 mm of oxide film and twist them. The end plane must be smooth and clean. Twisting is carried out before the actual welding. Point contact during work falls on it. This applies to all types of wires.

Flux must be added to the recess of the electrode. Then, with a quick movement, avoiding overheating, weld the wires along the end with a sliding touch. The touch time should not exceed 2 - 3 seconds.

If you don't have this experience, practice for a while. The main point is the confidence of tangential movement to the end with an instant shift along the plane.

The uniformity of the formed drop of alloy will serve as an assessment of your practice.

After cooling, the connection must be insulated.

Welding copper wires

Welding copper wires allows you to obtain a high-quality connection in two areas - electrical and mechanical. The ideal conductivity of the connection will eliminate heating of the wiring, and the strength will allow you to carry out work in junction boxes without fear of sudden disconnection.

All kinds of clips and screw clamps turn out to be weak in practice; with minor impacts, the wire jumps out of the socket, creating inconvenience and the possibility of a short circuit. For welding copper wires, it is most convenient to use an inverter welding machine. Welding is performed with carbon-copper electrodes.

The welding time is no more than three seconds, after which the insulation will begin to melt.

The requirements for preparing the twist are the same as for aluminum wires. The use of welding flux is not necessary here; it is enough to remove the oxide film by stripping the wires to a shine. You can treat stripped wires with solvent. You need to start welding immediately after preparation, preventing oxidation from forming.

Be sure to take into account the high thermal conductivity of copper, use pliers to hold the wire, protect your fingers from burns. After completing the preparation, you will only have to weld with a short point movement. The optimal contact duration is 2 seconds.

The resulting metal drop will be the node for a homogeneous wiring connection.

Do not forget about the high temperature of the welding site, let it cool naturally, and then insulate it with tape or special varnish.

Types of twisted electrical wires for welding connections

Electrical wiring connections are determined by the overall design and perform different functions within the overall circuit. For specific situations, different types of wire twists are used.

Properly performed twisting will ensure mechanical reliability of the connection and subsequent design (insulation with tape, installation in a junction box).

In the figure below we show the main types most often used in electrical installations for non-industrial purposes.

Welding copper wires with aluminum

The difference in the melting temperatures of copper and aluminum does not allow high-quality welding in the usual way. When the copper content in the welding seam exceeds 15%, the seam loses its strength to an unacceptable level.

If such a connection is necessary, predominantly aluminum should be melted.

Highly qualified specialists fuse a copper film onto the aluminum surface, and then weld copper wire to it.

We will not consider this issue in this article; the information is for general information only.

Conclusion

After carefully studying the article and some practice, you will be able to independently connect electrical wires using welding. This will save significant money. The average price for welding one joint is 100 rubles. The number of connections in a two-room apartment is more than 50.

How to connect wires with your own hands by welding video, see below:

We are happy to help you with our experience in arranging your homes. Follow safety rules and be careful!

Connecting cables

• Installation of modern electrical networks for various purposes often requires connecting cables.
  There are different ways to make these connections, but they all must meet the following requirements:
• the transition resistance should not be higher than the resistance on the solid part of the core;
• the electrical strength of the insulation at the junction should not differ from the strength in other places;
• the connection point must be reliably sealed and protected from mechanical damage.

A high-quality cable connection ensures uninterrupted operation of the network, while up to 90% of all power supply problems that arise occur precisely at the contacts at the connection point. Therefore, the choice of connection method should be taken with full responsibility.

Connection methods

Twisting is a fairly widespread type of connection in domestic conditions; until recently it was also used in production.

The method is used for single-core homogeneous conductors (copper or aluminum) and is carried out by twisting the conductors with subsequent insulation of the contact point. Twist crimping is performed using PPE (connecting insulating clamps).

Such connections are quite convenient for small installation work. However, it should be borne in mind that currently twisted connections are not provided for by the electrical installation rules (PEU).

Soldering is an affordable and reliable permanent connection, most often used to connect copper conductors, but aluminum connections of this kind are also allowed. The cores must first be cleaned, tinned and twisted.

After soldering, the contact group is insulated; the optimal method is insulation using a heat-shrinkable tube.

The solder connection is quite reliable and has excellent conductivity, but it is not recommended for use in places with a high level of mechanical stress.

Crimping – reliable connection of current-carrying conductors is carried out using special sleeves. Crimping is an effective connection method for relatively high currents.

The wire placed inside the sleeve is crimped using a special tool, forming a monolithic connection with the required resistance.

Using this method, you can connect copper and aluminum conductors.

Welding is a long-term connection with low resistance and heating level at the contact point. Using welding, it is possible to connect aluminum cable cores of any cross-section or aluminum and copper cores (with a cross-section of no more than 10 mm2).

Welding is performed in one of three ways: 1) contact heating; 2) thermite welding; 3) gas welding.

To avoid corrosion, welding joints are varnished and then insulated with tape (for greater efficiency, each layer of tape is varnished).

The welding method is popular, despite its labor intensity, as it provides high mechanical stability and excellent electrical contact. However, this method is unacceptable for making connections inside mechanical structures due to the bulkiness of the welding machines. In such cases, it is better to make connections using mechanical clamps of various kinds.

Mechanical connection methods using compression

• Bolted connections are quite bulky connections for high current circuits.
  The transition resistance in such contacts is stabilized by tightening the bolt. Used to connect no more than 2 conductors;
• Screw terminal connections are an excellent option for connecting conductors in distribution boxes.
  It is possible to connect conductors made of different materials using this method. For the connection, a special block is used with contacts located inside, to which the conductors are attached;
• Self-clamping terminal blocks are a fast and technologically advanced connection method in which it is enough to insert the conductors into the terminal block.
  The method is not suitable for flexible stranded wires. This connection eliminates short circuits and heating at contact points;
• Splice is a design for splicing a fiber optic cable. The fibers launched into the splice are brought into contact and fixed using special latches;
• Connection using cable sleeves is used for power cables.
  Metal or epoxy couplings can be used, but currently the most effective is the use of heat-shrinkable couplings made from thermoplastics according to the latest technologies.

So, there are a lot of ways to connect cables into a single circuit.

To choose the most optimal one, you should take into account the type of cables being connected and their operating conditions. There is also an article about connecting wires.

Soldering

Soldering is when electrical wires are joined using molten solder. This type of connection is most suitable for copper wires. Although there are now various fluxes for aluminum, experienced electricians prefer to refrain from such soldering. But if necessary, you can use special fluxes and even solder copper and aluminum.

Positive sides

This type of connection cannot be compared with twisting; soldering is much more reliable (in terms of reliability it is second only to welding).

Using soldering, you can connect stranded and single-core wires, as well as wires of different sections.

This type of connection does not require any maintenance throughout the entire period of operation.

Soldering is considered low in cost, the only equipment you need is a soldering iron, and flux and solder are very inexpensive, and their consumption is quite negligible.

Negative sides

The disadvantages of this method include high labor intensity. Soldering requires certain preparatory work; wire strands must first be tinned before twisting. The surfaces to be soldered must be free of oxides and absolutely clean before starting work.

And of course, you need experience in using a soldering iron, that is, the person who will connect the wires using the soldering method must have a certain qualification. After all, during the soldering process it is very important to maintain the required temperature conditions. An underheated soldering iron will not heat the connection well; overheating is also unacceptable, because the flux will burn out very quickly, not having time to do its job.

Soldering is a slow process, but this disadvantage is compensated by the reliability of the contact connection.

Installation

The step-by-step soldering process is as follows:

1. Remove the insulation from the cores by 40-50 mm.
2. Sand the bare areas of the wires until they shine using sandpaper.
3. Dip a heated soldering iron into rosin and move it over the cleaned surfaces several times.
4. Perform a twist.
5. Bring the soldering iron tip to the solder.
6. Now immediately heat the twist with solder, the tin should melt and fill the gaps between the turns.
7. Thus, the entire twist is enveloped in tin, after which it is allowed to cool.
8. Wipe the hardened solder with alcohol and insulate it.

Soldering wires with a soldering iron is shown in this video:

Soldering wires using a gas soldering iron:

Soldering twists by immersion in molten solder:

Welding

In order for the connection of electrical wires to be as reliable as possible, the considered twisting method must be subsequently secured by welding. It is similar to soldering, only now a welding machine is used instead of a soldering iron.

Positive sides

This method is most preferable to all others, since it meets all regulatory requirements in terms of reliability and quality.

The welding method is based on contact heating of the ends of the wires with a carbon electrode until a ball (contact point) is formed. This ball is obtained as a single unit from the fused ends of all connected cores, which ensures safe and reliable contact; it will not weaken or oxidize over time.

Negative sides

The disadvantage of welding is that such work requires certain knowledge, experience, skills and special equipment; you often have to turn to specialists.

Installation

In order to connect wires using welding, you will need the following devices, tools and materials:

• welding inverter with a power of at least 1 kW, its output voltage must be up to 24 V;
• carbon or graphite electrode;
• goggles or eye mask;
• welding leather gloves to protect hands;
• a mechanic's knife or stripper for removing the insulating layer from conductors;
• sandpaper (for cleaning the conductive surfaces to be connected);
• insulating tape for further insulation of the welding joint.

The sequence of work is as follows:

1. Free each connected wire from 60-70 mm of insulation.
2. Sand the exposed wires until they are shiny using sandpaper.
3. Twist, after biting, the length of its ends should be at least 50 mm.
4. Attach grounding clamps to the top of the twist.
5. To ignite the arc, bring the electrode to the bottom of the twist and lightly touch the connected wires with it. Welding happens very quickly.
6. It turns out to be a contact ball, give it time to cool, and then insulate it with tape.

As a result, an almost solid wire is obtained at the end, that is, the contact will have the lowest transition resistance.

If you connect copper wires in this way, then choose a carbon-copper electrode.

I would like to recommend that if you purchase a welding machine (it will be useful not only for connecting wires, but also for many other purposes), then choose the inverter option. With small dimensions, weight and electrical energy consumption, it has a wide range of welding current adjustment and produces a stable welding arc. And this is very important to be able to regulate the welding current. If you choose it correctly, the electrode will not stick and the arc will hold steady.

Watch how welding is done in this video:

We looked at the main types of wire connections. Now let’s briefly talk about methods that are used less frequently, but also guarantee quality and reliability.

Tools and materials

Special requirements are imposed on the strength and reliability of the connection of welding cables. Poor contact will not only complicate welding work, but also threaten unpleasant consequences, including electric shock. To prevent this from happening, you must be able to connect welding cables correctly.

To reliably and quickly connect two cables according to the scheme in question, you need to have the following materials and tools:

• Sharp knife;
• Pliers;
• Heat-shrink tube (you can also use electrical tape, but heat-shrink tube is still better);
• A piece of thin copper wire (1-2 meters).

Before extending the welding cable, you will need to remove the old tip and get rid of everything unnecessary.

Crimping

For this method, special tubular sleeves or lugs are used, with which the wires to be connected are crimped and crimped. The essence of the method is the joint deformation of the sleeve and the cores inserted into it. When deformed, the sleeve contracts and puts pressure on the conductive surfaces. The conductors engage in mutual adhesion, which ensures reliable electrical contact.

The advantage of such a connection is its reliability, and also the fact that it can be classified as “set and forget”; it does not require maintenance.

But along with the positive aspects, crimping also has a number of disadvantages. First, a special tool is required (a crimping press or mechanical or hydraulic pliers). Secondly, the quality of the connection directly depends on the correctly selected sleeve (it is selected depending on the number of cores being connected and their cross-section).

Before connecting two wires using crimping, they are not only stripped of insulation, but also lubricated with a special paste. Aluminum is treated with quartz-vaseline paste; it removes the oxide film and prevents it from appearing again. For copper conductors, quartz impurities are not needed; technical petroleum jelly is sufficient. It is needed to reduce friction. Lubrication also minimizes the risk of damage to the cores during deformation.

Next, the cores must be inserted into the sleeve until they mutually stop, and alternate crimping is performed on both sides. The pressed joint is insulated using insulating tape, varnished cloth or a thermal tube.

How to connect wires with sleeves is shown in these videos:

How to connect

It should be remembered that the safety of the performer and the quality of the work performed depend on the reliability of the contact connections of the conductors. The connections are subject to high technical requirements . But first of all, they must be resistant to shocks, tears and other mechanical influences. Therefore, it is very important to know how to connect two welding cables to each other.

The following are the most popular methods of connecting welding cables, each of which has its own advantages and disadvantages.

Let's look at the connection of welding cables in more detail.

1. The simplest way is to use additional accessories - welding connectors for connecting cables . They make work simple, fast and convenient. In addition, the use of connectors has a positive effect on equipment mobility.

There is a wide variety of these accessories on the market, differing in technical characteristics. Connection of welding cables: “male-female” - is a classification based on differences in the design of the connectors. You can find out how to choose the right detachable connections for welding cables and what you should pay attention to here.

2. The “twist” connection is the first and oldest method, characterized by fairly simple execution, quality and reliability.
Main disadvantages : this method is prohibited by a group of regulatory documents PUE (“Rules for the construction of electrical installations”); is an intermediate step before welding or soldering.

Video

The prohibition of the PUE method does not prevent homemade workers from successfully using it, as shown in the video below.

“Twisting” can be done in several ways, which are presented in the pictures below. Regardless of the chosen method, the insulation of the cores should be removed by at least 3-4 cm. Then the sections of the cores must be treated with acetone or white spirit, cleaned with sandpaper and you can begin twisting.

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There are also ways to connect welding cables if you have a certain set of equipment and additional accessories.

3. Soldering is a method of connecting cables by covering the heated ends of the wires with molten solder, which hardens and provides strength and high electrical conductivity of the connection. This method is used for small cross-section conductors.

Advantages: does not require special skills and specialized equipment compared to welding.

However, it is worth highlighting the disadvantages: a large number of preparatory operations, therefore, high labor intensity.

Before soldering, the conductors are cleaned of insulation and oxide film, then they are tinned, twisted and pressed with pliers. To avoid oxidation of the cleaned surface, fluxes should be applied to the treated areas.

Soldering of small copper wires is carried out using solder tubes filled with rosin or a solution of rosin and alcohol. These solutions are applied to the joint before soldering.

Then you can begin the soldering process: the joint is heated with a soldering iron or torch. Rosin or flux begins to boil, take a little solder onto the soldering iron tip and add it to the soldering zone by pressing the tip against the conductors. The solder spreads and fills the gaps between the wires, thereby creating a connection. If a torch is used, the solder is added to the torch.

After the soldering process is completed and the workplace has cooled, the flux residues must be washed off, the joint dried, coated with a special varnish, and insulated with tape or heat-shrinkable tubing.

4. Crimping is the process of connecting wires using copper or aluminum sleeves. It is necessary to select a sleeve depending on the size of the “twist” and the cable material (copper or aluminum).

The wires must be cleaned to a metallic shine, bundled/twisted, and then a sleeve is put on them and clamped with special pliers. In this case, the walls of the sleeve are pressed into the conductor conductors and a reliable electrical contact is formed.

Advantages : high reliability; no high demands are placed on the performer regarding his qualifications; independence from the availability of electricity.

Disadvantages: rigid sleeve leads to wire rupture near the sleeve; it is necessary to have a supply of sleeves of various sizes; if the connection is larger than the diameter of the cord, the cable will touch surrounding objects.

Bolted connection

Bolts for connecting wires used to be often used, now this method is more characteristic of circuits with high voltage. The contact is reliable, but the electrical unit connected in this way is too cumbersome. Until recently, large distribution boxes were installed in apartments; at least somehow, such a connection could be placed in them. Modern boxes are smaller and are not designed for switching wires using this method.

But you definitely need to know about it, because this is one of the ways to solve the eternal problem of connecting conductors made of different metals. The bolt contact is ideal for switching completely incompatible cores - thin and thick, aluminum and copper, single-core and stranded.

The wire strands must be stripped and the ends twisted into rings. A steel washer is put on the bolt, then the rings of the wires to be connected are put on (this is the case when they are made of homogeneous metal), then another steel washer follows and everything is tightened with a nut. If aluminum and copper wires are connected, another additional washer must be placed between them.

The advantages of this connection are its simplicity. If necessary, the bolted structure can always be unscrewed. If necessary, you can add more wire strands (as long as the bolt length allows).

The most important thing in this type of connection is to prevent direct contact between copper and aluminum, and do not forget to place an additional washer between them. And then such a switching unit will serve for a long time and reliably.

Modern technologies

In many cases, the methods discussed are gradually becoming a thing of the past. They were replaced by factory wire connectors, which made installation and switching work much easier and faster:

1. Terminal blocks, inside of which there are tubular brass sleeves. Stripped wire strands are inserted into these tubes and secured by tightening the screws.
2. PPE caps, inside of which there are compression springs. The cores are inserted into the cap and then turned clockwise with little effort, thereby reliably compressing the connected wires inside.
3. Self-clamping terminals. It is enough to place the wiring in them, and there it is automatically fixed due to the pressure plate.
4. Lever-type terminal blocks. This connecting element is reusable. It is enough just to lift the lever, insert the conductor into the contact hole and lower the lever back, reliable fixation is ensured.

We do not talk in detail about all existing terminal blocks, since there is a separate article about this, where each type of wire clamp is discussed in detail.

We hope that we have clearly explained to you how to connect the wires correctly. Choose the method that suits you best. When choosing, take into account the cross-section and material of the conductors, the location of the connection (outdoors or indoors), and the amount of load current that will flow in this electrical circuit.

How to choose a welding cable

Equipment of any type will serve its owner for a long time if the wire is selected correctly. When choosing a conductor, you need to pay attention to the following points :

• the cable must meet the technical requirements for it: resistance to impacts, breaks, bends, aggressive chemical environments, temperature changes, ultraviolet radiation, mold formations;
• The cord must withstand the maximum current that the welder’s unit produces.

More detailed information is presented in the articles on KG, KOG cables, as well as in the publication on conductors for the inverter.