According to clause 2.1.21. PUE, connection of wires and cables should be carried out in one of the following ways: by welding, crimping, using screw or bolt connections, or by soldering in accordance with applicable instructions approved in the established manner. As you can see, the "twist" is not mentioned here at all. We can safely conclude: twisting is practically prohibited by PUE.

However, let's see why the official attitude to twisting is so unambiguous, what could be the reason for its exclusion from the list of permitted methods of connecting wires, because it is completely clear that this was done for a reason. Allowed: crimping, soldering, welding and screw connection. To begin with, we will consider what are the features of the allowed connection methods, and what is their difference from twisting. Soldering and welding require solidity and the highest possible conductivity of the created permanent connection ...

It happens that when you turn on a particular electrical appliance in an apartment, such as a multicooker or a lighting system with energy-saving lamps, or the power supply of a particular electrical appliance, the circuit breaker starts to buzz in the electrical panel. And usually this phenomenon is not associated either with the increased power of the connected consumer, or with the corresponding current approaching the rating of the machine. And it is connected with a certain power or with a certain household appliance.

In some cases, the hum completely disappears with an increase in load power, and often the landlord has no complaints about the smell of burning ... So, there is no arc buzzing inside the machine. And then what? Where does this hum come from? Is he dangerous? How to deal with this phenomenon and is it worth it to fight with it at all? Let's think about it. Everyone who is familiar with the circuit breaker device knows that two protective tripping mechanisms are simultaneously implemented inside it: thermal and electromagnetic ...

One of the reasons for this unpleasant phenomenon is explained very simply. Our body is very interesting in matters of electrical safety: on the one hand, with our sensory organs we can’t recognize the presence of a nearby potential of electrical voltage and, at the same time, when we get under its action, we get unpleasant sensations, injuries, and tragic injuries. In such situations, it is customary to say that we are shocked.

Let's try to open this question in more detail, from the point of view of electrical engineering. We will need to take into account the nature of the current flow, the properties of our body, the experience of accidents accumulated by our predecessors, formulated by safety rules. An electric current is an ordered (oriented in a certain way) motion of the smallest particles with charges. It is created under the influence of the applied external forces of the electric field ...

Modern man is used to the fact that electricity constantly serves to satisfy his needs and does a great, useful job. Quite often, the assembly of electrical circuits, the connection of electrical appliances, the electrical installation inside a private house is performed not only by trained electricians, but also by home craftsmen or hired migrant workers.

However, everyone knows that electricity is dangerous, can injure and therefore requires the quality of all technological operations to ensure reliable passage of currents in the working circuit and ensure their high isolation from the environment.The question immediately arises: how to check this reliability after the work seems to be done, and the inner voice is tormented by doubts about its quality? The answer to it allows you to give a method of electrical measurements and analysis, based on the creation of increased loadcalled phase-zero loop resistance measurement...

Of all the methods developed by numerous researchers for connecting an induction motor, in practice two are most often used, called the methods of a star and a triangle. Both of them use a capacitor trigger, characterized by an accessible elemental base. The name of each method is given by the method of connecting the stator windings to the network. You can find out how they are assembled in a particular engine using a plate mounted on the body.

Usually, even on older models, you can make out the method of connecting the windings and the mains voltage for which they are created. Such information can be trusted if the engine has already been tested in operation and there are no complaints about it. But, even in this case, it is necessary to conduct electrical measurements. Let's start with a poor version of the installation of stator windings when their ends are not marked at the factory, and the zero assembly for the star circuit is made inside the case ...

Sometimes it happens that although all the lights in the room are intact, the light suddenly goes out in one of the rooms, or some kind of working electrical appliance that seems to be working, or one of the switches starts to fail, etc. Here, one has to resort to the so-called “ringing” procedure, that is, it is necessary to somehow check the integrity of some conductors.

The conductor could be damaged during repair work, the junction could burn out due to overload in poor installation conditions, but for some reason there could be a break in the core ... Often in such cases we encounter a situation where we find mixed up wires inside the soldering box on the wall labeled wires and twists wound with tape wrapped in tape. What to do, because it is necessary to check all the cores, identify a break, fix the malfunction, and the wires are mixed up? After - of course we mark the wires ...

It is quite unpleasant to encounter a problem when suddenly the outlet is out of order. There are two main types of malfunctions, but there are much more variations, as well as ways to eliminate them. Let's see why all the outlets or one of them stopped working. But first, familiarize yourself with the design of the outlet.

First you need to find out the device itself. First of all, you see the front panel fixed in a frame. They are bolted to the main part through one, less often through two screws. After removing the front part, we see the main part, which is fixed in the undergrowth with the help of two bursting legs, and each of them is fixed with a screw. When you tighten the screws, the legs straighten and lock, and when you loosen, the legs lower and you can remove the outlet from the wall.If the single outlet you see in the center are two horizontally located holes for the plug, they lead to the conductive busbars. There may not be holes...

When choosing a cable underfloor heating system as the main or additional heating system, it is first necessary to determine the power of the heating cable for this system. It is very important to perform the correct power calculation so that the installed heating system functions correctly and fully complies with the requirements that apply to it.

There is no single rule by which it is possible to calculate the required power of a heating cable for a warm floor. When calculating the power, it is necessary to take into account several factors that significantly affect the functioning of the warm floor. Therefore, the first step in the calculation will be the refinement of the source data: The required degree of heating of the rooms. In this case, it is necessary to clarify for what purposes a warm floor is used - as the main heat source or as an additional or backup ...