Forums and social networks have long been the place to address many, including professional, issues. Often, experienced professionals turn to colleagues for advice. So, installers are looking for the support of designers in terms of knowledge of standards, and designers ask "practitioners" about the actual installation conditions of this or that equipment. True, some tasks are so complex that they cannot immediately find the truth and a dispute erupts. Let's try to figure out three frequent discussions.

How many places do you need to choose boxing? Given: in the electrical circuit of the switchboard, there is a VA 47-29 3P 63 A circuit breaker for input, five AD 12 2P 16 A / 30 mA differential circuit breakers and seven VA 47-29 1P 10 A. : 20 places are taken, we add a reserve of 20%, that is, four more places. ” The second side: “You should not even take less than 36 positions. It is very difficult to dodge in boxing space at 24, and all that needs to be installed there ...

7 questions for real electricians.And what do you think? 1. You are the director of energy sales. A subscriber came to your appointment and said that he was paying. I take 10 amperes from the network and return exactly the same amount to her. What should I pay for? Explain to him why.

2. There is such an episode in E. Radzinsky’s novel about Stalin. A giant statue of Stalin was installed on the Volgo-Don Canal. Unreasonable birds sat on their heads and expressed disrespect for the great leader and teacher. To combat them, voltage was brought to the monument. On landing, birds that had perished fell dead on the ground. Do you think this is true or fiction writer?

3. In the program “duty on the country”, the famous comedian M. Zhvanetsky complained about the sockets “pull the plug, and the socket also extends with it”. But is the “duty officer on the country” handling the outlet correctly? ...

At the end of the twentieth century, the leader of the spiritual community of Methernita, Paul Baumann, developed a very unusual electric power generator, which was called “Testatika”.

The generator operated thanks to the high voltage generated by the modified Wimshurst machine, and served to convert static electricity received directly from the air surrounding the machine into direct voltage and current. And although the concept of creating a machine was originally based on the idea of ​​using as simple and affordable elements as possible in its design, generators of this type, with disks with a diameter of 50 to 200 cm, rated power up to 30 kW, have successfully provided all the needs of the community for electricity for the past more than three decades. Instead of Leiden cans, similar to those that can be found in the designs of ordinary electrophore machines ...

Judging by the abundance of videos and comments on them on YouTube, the topic of the so-called "Free Energy" has already snapped many and continues to excite the minds. Which is not surprising, because the desire to learn new things is quite natural for an intelligent person. However, not every person, having first seen something unusual and new, is able to correctly interpret what he saw. For this reason, many immediately begin to stigmatize inventors, innovators, calling them deceivers, charlatans, scammers. But is it worth judging so clearly? Let's think about it.

The first law of thermodynamics tells us that energy cannot be created or destroyed, it can only transfer from one species to another. This means that if the Free Energy devices, in the form in which they are presented on YouTube, are real, then they simply transform the energy of some unusual sources ...

The question of whether to install an RCD on the lighting circuit has recently been relevant. Meanwhile, there are no strict regulations regarding the installation of RCDs on lighting lines. Let's see what the RCD can give in this case, and how things will be without it. After which each reader will be able to conclude for himself whether to put the RCD on the lighting or not.

First, recall the principle of operation of the RCD. The differential current transformer inside the RCD allows you to detect the excess of the differential current. If such an excess occurs, the protected electrical circuit will open. RCD is included in the gap of the protected circuit - in the gap of the neutral and linear conductors. After the RCD is put into operation, the contact inside it is closed by a solenoid, held in this state, and the device freely passes a current through the supply circuit ...

They are called free energy machines or simply perpetual motion machines ... Since the time when mankind put electricity to its service, the tireless minds of inventors have been looking for a brilliant solution - a source of free energy without the need for any kind of fuel. What can I say, historians have always found technical sketches of “perpetual motion machines”.

Here and there, now more often than in ancient times, one can find projects of “perpetual motion machines”. Let’s take a closer look at this problem and see what does exist and what it actually is. Educated people are well aware that the perpetual motion machine cannot work in principle, this does not need to be proved. But since the debate does not subside in any way, this requires attention. The eternal engine, if it were a real device, would violate the laws of thermodynamics, which are actually indestructible ...

Before installing a two-tariff electricity meter, everyone wonders how profitable it will be, and whether it will be profitable at all? In fact, not everyone will experience the economic effect of installing a two-rate meter. For some, the benefit will immediately become apparent, for someone it will appear after a while. Let’s figure out how things really are with two-tariff electricity meters, and in which cases the transition is not at all advisable, and it’s more profitable to leave a single-rate meter.

Continuously, throughout the day, everywhere there is a dynamics of electricity consumption, and this applies both to apartment buildings of megacities, and to private houses. Most people sleep at night, and during the period from midnight to 5 a.m., electricity consumption is minimal. Waking up in the morning, getting ready for work, people begin to use electrical appliances ...

Electric underfloor heating can be a truly universal means of heating a room, apartment, or country house. It allows you to evenly distribute heat over the entire surface of the floor itself, and fully warm the air in the room. All types of flooring, whether it is carpet, linoleum, laminate, parquet, tile, or even natural stone, are compatible with such a heating system.

The basis of the electric underfloor heating system are heating cables laid under the floor covering. This can be single-core or two-core cables, or heating mats, which are a reinforced plastic mesh in which a two-core heating cable is laid. The power supply to the cables is regulated by a thermostat that controls the amount of heat transmitted to the floor. During installation, the cables are laid in a concrete screed with a thickness of 3 to 5 cm with the same pitch ...