At the end of 2018, the Digital Economy program was approved, according to which it is planned to deploy an internal infrastructure for collecting, processing, storing and providing data in Russia. This means that in the coming years the number of specialized data centers or data processing centers (DPCs) will increase in the country, and the demand for the electrification of such facilities will increase.

The main difficulty is that domestic standards for power supply of data centers are under development (now experts use the American standard TIA 942 and PUE). The construction of data centers in Russia is developing, but despite the growing experience in this area, engineers are faced with rather difficult issues. The TIA 942 standard identifies four levels of data warehouse reliability: Tier I, II, III, and IV. The first two are considered not very reliable, so they are not used for more or less large data centers ...

There are several ways to connect the conductors of wires and cables. Each of them is characterized by its advantages and disadvantages. Recently, a way of connecting conductors using Wago terminal blocks has become increasingly popular. Many people prefer this method of connecting conductors due to such an advantage as ease of connection.

Using these terminal blocks, the process of wiring is greatly simplified: to connect the conductors, you do not need a special tool, nor do you need special skills and experience in conducting electrical work. Wago terminals come in several series, each of which has its own design features and method of clamping conductors. The easiest to install are the Wago 773 series self-clamping terminals and the more compact 2273 series terminals ...

Proper installation provides more than 50% of the ability of a fire-resistant cable line (OKL) to resist fires). We'll figure out what “competent installation” means. The concept of “fire-resistant cable line” appeared in 2013. In essence, OKL is a ready-made, laboratory-tested set of equipment for installation: a special cable and mesh for its suspension, metal trays, junction boxes, couplers, dowels, anchors.

OKL necessarily has a certificate of conformity 123-ФЗ "Technical regulation on fire safety requirements" and GOST R 53316-2009 (or GOST 31565-2012), which specifies the installation procedure: all possible components and their combinations are considered, for each OKL configuration option are indicated uptime and fire resistance limits. If you follow the instructions from the certificate, then it is impossible to make a mistake when installing OKL. However, in practice, many installers work according to the usual pattern ...

Nothing lasts forever in this world, and circuit breakers that operate in home electrical panels sooner or later fail. Problems with power supply begin, they constantly knock out or do not work at all. In this article I will tell you how to choose the right machine for replacing the old one in the electrical panel. To prevent the statements of "experts" about the style of presentation, I will note in advance that it is aimed at a home master who wanted to re-energize an electrical panel.

To begin, consider how to determine the health of the machine and the reasons for which malfunctions occur. There are 5 main problems with circuit breakers in switchboards, if we consider them at the household level and in simple language, of course. False alarms and trips at the same load.The check box of the machine does not cock when trying to turn on, jammed, or returns to the disabled state. The switch case has become charred, blackened or led ...

A home foreman in the household often has to do something that manually is not always easy and convenient. In this case, a variety of machines come to the rescue. But you need a device that will drive them, for example, an electric motor. But asynchronous three-phase motors, although simple in design and very common, it is not always possible to find and buy capacitors for it. Therefore, you can use engines from household appliances.

In this article, we will consider the scheme of connecting the motor from the washing machine to the network for direct rotation and reverse. Most washing machines use commutator motors. They are convenient in that they do not require starting and working capacitors, can be directly connected to the network. In addition, the simplest speed control for them can be bought at any electrical goods store. The collector motor from the washing machine consists of a stator, a rotor ...

Modern electricians lay wiring in the corrugation on the street, indoors, on the surface and inside the walls. Despite all the advantages of this installation method, there are a number of features of its use. The fact is that there are three varieties of corrugations and each of them is intended for use for certain purposes. In this article we will look at typical errors when laying cables and wires in the corrugation.

Types of corrugation Strange as it may sound, but the corrugation is chosen by color. There are three main materials for the production of corrugated pipes, in order to avoid mistakes in the future, remember: white or gray - polyvinyl chloride (PVC), black or orange - low pressure polyethylene (HDPE), blue - polypropylene (PPR). What is the difference between corrugations? PVC corrugations are used indoors, and they crack due to ultraviolet radiation. But this material does not support combustion. The mechanical strength is lower than that of analogues ...

The speed of rotation of an induction motor is usually understood as the angular frequency of rotation of its rotor, which is given on the nameplate (on the nameplate of the motor) as the number of revolutions per minute. A three-phase motor can be powered from a single-phase network, for this it is enough to add a capacitor parallel to one or two of its windings, depending on the mains voltage, but the motor design will not change from this.

So, if the rotor under load makes 2760 revolutions per minute, then the angular frequency of this engine will be 2760 * 2pi / 60 radians per second, that is, 289 rad / s, which is not convenient for perception, therefore they simply write “2760 rev / min. " As applied to an induction motor, these are revolutions taking into account slip s. The synchronous speed of this engine (excluding slip) will be equal to 3000 rpm, since when supplying stator windings with mains current...

Leakage current as a physical phenomenon You have probably heard the expression "leakage current" or "leakage current to earth", but can anyone explain what it is? What causes a leakage current, why is it dangerous, how to eliminate it? We will try to get an answer to these questions.

Firstly, for a leak to occur, a current needs a closed electrical circuit, like any conduction current. And practically any conductive object can become a load here: a person’s body, bathtub, pipe, part of the electrical installation case, etc. And if the leakage current turns out to be excessively high, then there may be a danger to human health.That is why it is necessary to have an idea of ​​this phenomenon. Schematically, the figure shows the path that the leakage current has laid for itself through the human body. Why did the current go through the body in this example? Because the resistance between the housing and the live parts of the installation ...