Technical means of restricting the penetration of undesirable persons into the protected area are increasingly being used to improve the safety of homes and industrial premises. Among them, intercom systems that allow remote control of visitors and control their access are popular, and their designs are constantly being improved.

The device and the intercom operation scheme are created for specific consumer requests. They differ in the principles of construction, elemental base, installation, maintenance, operation technologies. The following principles are used in the work of doorphone circuits that control and manage people's access: creating a closed area with the possibility of restricting visitors from using technical means based on automatic locking devices, organizing communication points ...

This article will highlight the topic of mechanical and electrical characteristics of electric motors. Using an asynchronous motor as an example, consider such parameters as power, work, efficiency, cosine phi, torque, angular velocity, linear speed and frequency. All these characteristics are important when designing equipment in which electric motors serve as drive motors. Especially asynchronous electric motors are especially widespread in the industry today, so we will dwell on their characteristics. For example, consider the AIR80V2U3.

The nameplate (on the nameplate) of the motor always indicates the rated mechanical power on the shaft of the motor. This is not the electric power that this electric motor consumes from the network. So, for example, for an AIR80V2U3 engine, a rating of 2200 watts corresponds precisely to the mechanical power on the shaft ...

Replacing home electrical wiring is one of the most expensive stages of major repairs in an apartment or house. Against the backdrop of constantly rising prices for cable products and other components, the question of how to replace the wiring with minimal cash investment is becoming increasingly relevant.

In this case, you can’t just unreasonably remove certain elements or underestimate the cross-section of the wires, as this can lead to the fact that the installed wiring will be unreliable and will not provide full power to home electrical appliances. Therefore, we need to consider how to save money when replacing home wiring without compromising reliability, which we will discuss in this article. The process of replacing electrical wiring can be divided into three main stages: drafting a future electrical wiring, selection and acquisition of components ...

In this article, we will discuss the topic of selecting analogues of bipolar and field effect transistors. What parameters of the transistor should you pay attention to in order to choose the appropriate replacement? What is it for? It happens that when repairing a device, say, a switching power supply, the user is forced to contact the nearest store of electronic components, but the assortment does not contain just such a transistor that failed in the device circuit. Then you have to choose from what is available, that is, select an analogue.

And it also happens that the burned-out transistor on the board was one of those that have already been discontinued, and then it’s just the right thing to do is the datasheet available on the network, where you can see the parameters and select the appropriate analogue from those currently available.One way or another, you need to know what parameters to choose, and this will be discussed later.First, let's talk about bipolar transistors ...

All electrical appliances consuming electricity are created by manufacturers according to state standards, when it is necessary to apply voltage to a motor windings, filaments of light sources, heaters and other actuators in a strictly defined way. For this, a power cable is used, which is connected on one side to the terminals of the device, and on the opposite side, on a plug inserted into a socket so as to ensure the correct operation of the actuator.

For the same purpose, the contacts of the electrical outlet must be connected to the wiring, observing the established installation rules, and not arbitrarily. Even in a modern single-phase AC network, according to existing rules, three wires are used, and not two. This is earlier, in the electrical circuit with grounding, made according to the TN-C system, arbitrary connection ...

Concealed wiring is a type of wiring that provides for the installation of a cable (wire) of the wiring lines in the wall - under a layer of plaster or other finishing material. Such wiring from the point of view of aesthetics is most preferable, since the cable routing is not visible. But at the same time, this feature of hidden electrical wiring creates additional problems if it is necessary to search for cable locations in case of damage to a particular wiring line or if it is necessary to replace the wiring during repairs in the home.

Why else do you need to know the wiring location? Very often, when mounting various interior elements on the wall (wall cabinets, paintings, shelves, TV mounts, etc.), fasteners get into the cable (wire), which leads to its damage. Even more dangerous is that during drilling ...

People build buildings mainly for two purposes: for living or for solving technical issues. When creating the power supply system in these rooms, special attention is paid to the reliability and safe operation of the equipment. In residential buildings, much attention is paid to the design of rooms. The electrical wiring in them is usually hidden inside the walls or created in an open way from exclusive expensive components that emphasize the individual style of the owner.

Buildings for technical needs, of which the garage belongs, are designed, as a rule, with a simple and open wiring diagram. Hiding it inside the walls does not make much sense: it’s easier to maintain and modify. For the vast majority of garages designed to contain one or two cars, single-phase power supply of 220 volts of industrial frequency is used. To create work lights and power outlets group ...

Home wiring is the heart of an apartment or private house. Wiring must be reliable and safe, and also fully meet the needs for the inclusion of household electrical appliances in the network. Very often, a number of errors are made during the installation of electrical wiring, which in the end can lead to various negative consequences.

In this article, we will consider the most common mistakes that are made during the installation of home wiring and the consequences that these errors may entail. The very first stage is the preparation of a power supply project. This project involves drawing up a wiring diagram taking into account the loads of electrical appliances, the desired locations of sockets, switches, lighting elements.In this case, the calculation and selection of protective devices in the electrical switchboard is also carried out.k, cables for electrical wiring lines...