When repairing electrical wiring, it is always necessary to have access to the ends of the connecting cables and the contacts of sockets, switches. In modern buildings, a hidden method of installing communications is often used, when all wires are hidden inside the walls for security and design purposes.

To the veins of the cable ends can be reached only at the entrance of the lamp, switch, socket and electrical distribution box. For the convenience of servicing such electrical equipment, certain rules must be taken into account: cables are laid along certain routes provided by the project, in the places where sockets and switches are installed inside the wall, recesses are made to accommodate the corresponding equipment, installation boxes are mounted inside the recesses into which the switches and sockets are mounted. The most favorable time for such work ...

The strongest, most powerful permanent magnet available on the market today are neodymium magnets. They have the chemical formula Nd2Fe14B, and have an exceptional magnetic energy density of up to 512 kJ / m3. If earlier samarium-cobalt (SmCo) magnets were considered the most powerful ones available, then, starting in 1986, they were gradually replaced by neodymium magnets, much more economical in cost of production, albeit with a lower Curie temperature.

With the development of the electronics industry, from the 90s to the present, neodymium magnets have gained great popularity everywhere, and many are still surprised by their remarkable properties, because such a magnet can lift a load thousands of times the weight of the magnet itself. It all started with the fact that in 1982 the Japanese company Sumitomo Special Metals, working together with the American General Motors on the search problem ...

When purchasing a motion sensor to turn on the light, do not take the first one you get. To begin with, it is necessary to determine some significant parameters, the conditions for its future use, and, depending on them, choose a sensor with suitable technical characteristics.

There are four main parameters, taking into account which you will not lose and will not be disappointed; Here are these parameters: environmental conditions, the power of the switched equipment, the characteristics of the response zone (the required viewing angle and the radius of the sensor), the requirements for the sensor response time and the adjustment of the light level.

For different environmental conditions, sensors with various degrees (classes) of protection are provided. The protection class shows how resistant the sensor is to dust, other physical influences ...

The choice of welding household appliances is huge. In this article I will talk about the Resant 250 inverter type welding machine, why this particular model is what is good and what is not. I do not regret the choice made, I can say about it right away. In the kit, as a gift, a welder's helmet, I bought electrodes separately.

Advantages of the welding machine. The range of currents and applicable electrode diameters (up to 5 mm) allows you to perform welding work at a professional level (with the exception of volumes, since there are limitations in continuous operation). Good protection, smooth adjustment, low weight and proper layout of the connections allows you to work in hard to reach places. Excellent cable insulation, very rigid holder springs and negative terminals, reliable cooling, the ability to work at sub-zero temperatures (minus 8 - no problem) ...

Children's lamps, in addition to their intended purpose, are able to play the role of an important element of decor and harmoniously complement the most unusual composition in the room of a mischievous little boy or little princess.

What to look for when choosing children's lamps? A product purchased for small users should be, above all, of high quality. Considering safety, it is better to give preference to models in which the ceiling, which is securely fixed to the base of the device, is made of impact-resistant materials that will not break when dropped.

A table lamp should fully illuminate the work surface, without taking up much space. Please note that the light from her does not hit the child in the eye, but gently scatters down. Sharp and traumatic corners and surfaces, overly fragile parts and unreliable fastening mechanisms are not allowed in children's fixtures ...

Today, solar panels based on silicon alone are far from the finale on the path to curbing the energy of sunlight and converting it into usable electrical energy. Many works are still being carried out by scientists, and in this article we will consider five unusual solutions that some of the modern researchers are developing.

In the American National Laboratory of Renewable Energy Sources (NREL), a solar battery based on semiconductor crystals, the sizes of which do not exceed several nanometers, are built up, so-called quantum dots. The sample is already a champion in terms of external and internal quantum efficiency, which amounted to 114% and 130%, respectively. These characteristics show the ratio of the number of generated electron-hole pairs to the number of photons incident on the sample and the ratio of the number of generated electrons...

The massive construction of the housing stock and the ongoing reconstruction of old buildings push apartment owners to the need to independently understand the technologies for performing electrical work in their premises. This allows you to create an individual electrical system that meets the specific needs of the owner, rather than using a typical circuit designed for the average consumer.

In order to properly assemble the electrical panel in a newly built apartment, it is necessary to draw up a project, in which it is necessary to provide for the detailed implementation of your needs inside each room, to consider the location of the lights and switches for them, the number of sockets for portable and stationary electrical appliances. Along with electric wires, it is often necessary to lay pipelines for water supply, heating, telephone linesantenna cables ...

The whole civilized world is gradually, but with more and more decisive, switching to LED lighting, and this is not at all surprising, since LEDs open a new era in the technology of light production itself, so this highly efficient technology claims to be the main one of its kind in 21 century. But how will the use of LEDs affect human health? We will try to figure it out now.

Let's start with the environmental aspect associated with the content or absence of heavy metals in LED lamps. Most recently, fluorescent energy-saving lamps containing mercury vapor in a flask were very popular, and this is a fact that causes unreasonable fears. In the event of a malfunction, the disposal of such lamps should be done in a special way, they cannot simply be taken and thrown into the bin, and, as a result, in many countries these lamps are distributed ...

Such a question sometimes arises for novice electricians or apartment owners who are well versed in a set of repair tools, but previously did not particularly delve into the wiring device.And then the moment came when the socket stopped working or the light in the chandelier glows, but I don’t want to call an electrician and there is a great desire to do everything ourselves.

In this case, the primary task of the home master is not to eliminate the malfunction, as it seems at first glance, but to comply with electrical safety rules, eliminating the possibility of falling under the influence of electric current. For some reason, many forget about it, neglecting their health.

All current-carrying parts of the wiring must be reliably insulated, and the contacts of the sockets are hidden deep into the case so that they cannot be accidentally touched by exposed parts of the body ...

Living quarters for people are constantly being improved. They are increasingly appearing electrical appliances that improve life. Electricity consumption increases, and the wires laid during construction generate a resource: metal and insulation age, losing their properties from overloads, heating, ultraviolet radiation and mechanical stress.

The aluminum wiring operated since the times of the USSR has long been in need of replacement. Increased safety requirements canceled the TN-C system, which did not provide for the grounding of electrical appliance housings, the use of a potential equalization system, and protection against leakage currents.

Owners of old apartments do not always imagine how wires are placed in their rooms, because there are many options for laying them. The main classification of wiring is carried out by type of installation ...

Over the past few years, many companies involved in the development of green energy sources have been conducting painstaking research aimed at finding alternative methods for generating it. So, the Dutch company Plant-e was successful in using for this purpose the by-products of photosynthesis of some water-loving plants.

The principle of generating electricity is somewhat similar to the well-known school experiment, when the electrodes inserted in potatoes or in lemon allow some electricity to be extracted, however, the technology described here has a more complex device.

The presentation of Plant-e's new technology took place in the autumn of 2014 in a park in Hamburg. The project was called “Starry Sky”, and its essence was that 300 ordinary LED lamps will receive electricity from living plants ...

Instead of the introduction: in the grammar dictionaries of the Russian language there are no definitions of the words “stroba” or “strobe”. The online service “” does not know them either.

But the Wikipedia joint folk art encyclopedia combines these two terms into one name and sends it to the technical literature: PUE, GOST 21.201-2011.

In these documents, the term "furrow" is used, which is created in the walls to hide electrical wiring or pipelines. This technique not only improves the design of the premises, but also creates additional mechanical protection for the laid communications from damage. However, in colloquial speech among electricians, the word "strobe" is more familiar. A professional tool for cutting them is called a chisel cutter even by manufacturers. Therefore, in the article we will adhere to the prevailing folk traditions ...