When installing the lighting system in the entrance, it would be nice to make it as economical and automated as possible so that the light turns on only when it is really necessary, and does not burn around the clock, as was the custom in the nineties - until the light is turned off or smash.

In fact, such a system can be useful not only for entrances, but also for various utility rooms, parking lots, corridors, etc. Infrared motion sensors are very suitable here, able to respond to objects moving in their area of ​​operation. The primary task is to correctly install and configure such a sensor, and this will be discussed later. Modern models of infrared motion sensors allow the adjustment of three parameters: the threshold of illumination, indicating the onset of darkness, when the motion sensor begins to work ...

The terms "capacitive load" and "inductive load", as applied to alternating current circuits, imply a certain nature of the interaction of the consumer with an alternating voltage source.

Roughly this can be illustrated by the following example: connecting a fully discharged capacitor to the outlet, at the first moment of time we will observe an almost short circuit, while connecting the inductor to the same outlet, at the first moment of time, the current through such a load will be almost zero. This is because the coil and capacitor interact with alternating current in fundamentally different ways, which is the key difference between inductive and capacitive loads. Speaking of capacitive load, they mean that it behaves in an AC circuit like a capacitor.This means that a sinusoidal alternating current will periodically recharge ... 

If you are going on vacation, make sure that you will not be left without your smartphone if it is discharged. Sockets are not the same everywhere, like mains voltages. If the supply voltage in this country is suitable, it remains to acquire such an adapter or to find out in advance where to buy it on the spot or order charging with such a plug. In this article we will talk about the types of outlets and how many volts are in the outlet in different parts of the world.

All countries of the world use alternating current in their electrical networks. The difference lies in the voltage and frequency of the network. Two common frequencies are distinguished: 50 Hz and 60 Hz. Voltages also differ - 100, 110, 115, 120, 127, 220, 230 or 240 Volts. In this case, the voltage and frequency can be different in different regions of the same country, as, for example, in the eastern part of Japan, a network with a frequency of 50 Hz, and in the western - 60 Hz. This may be due to the fact that electrification occurred at different times or part of the country was part of another country ...

Batch switches are used for switching electrical circuits. At the same time, they can be used both in direct and alternating current circuits with voltage of 220, 380 V. However, people often confuse and call circuit breakers “packets” in the old fashion, which is fundamentally wrong. Therefore, let's understand what is and what are the need for package switches, as well as how they differ from circuit breakers?

A packet switch is a switching device for turning on and off electric circuits, actually for the same purposes as circuit breakers. He got this name due to the fact that it consists of the same type of elements (packages) assembled on the same axis and secured with pins.Thus, in production from the same parts you can assemble a switching device with any number of poles (contact groups). They are characterized by a rotary movement of the handle device ...

Currently, 3D printing technology is increasingly being used to create decorative elements, machine parts and apparatus, and various functional units. And the most relevant developments allow you to print entire buildings and even organs and prostheses for humans. At the same time, on the market you can find printers starting at several hundred dollars, for domestic use and tens of thousands of dollars - for industrial use.

In this article, we will cover basic information about the types and design of a 3D printer. The concept of 3D printing is not so clear. It is divided into many types, differing on the principle of forming a printable object and the materials used for this. What are they like? FDM-printing is the most common way to obtain volumetric objects in everyday life, respectively, and the cheapest option for volumetric printing. In this case, the 3D printer prints with molten plastic ...

For an electrician, switching equipment is one of the main devices that you have to work with. Circuit breakers carry both switching and protective role. Not a single modern electrical panel can do without automatic machines. In this article we will look at how a circuit breaker is designed and operated.

A circuit breaker is a switching device designed to protect cables from critical currents. This is necessary in order to avoid damage to the conductive conductors of wires and cables in case of interphase faults and earth faults. The main task of the circuit breaker is to protect the cable line from the effects of short circuit currents. The main characteristics of circuit breakers are: rated current (insert a series of currents), switching voltage, time current characteristic ...

In the work of an electrician, one of the most frequent operations during electrical installation is stripping and connecting wires. In such seemingly simple actions, there are a number of nuances. Yes, and it is not recommended to remove the insulation from the wires with a knife, because if you do not have developed skills, you will damage the conductive wires. And this will lead to problems in posting in the future. Read about stripping tools in this article.

Fans will answer that you can remove the insulation with a conventional knife. You can do it this way, but there is a small problem. When stripping insulation from a soft wire with multi-wire cores, especially with cross-sectional conductors up to 1.5 sq. mm many make a mistake - cut the veins. As a result, the contact area decreases and the cross section due to the fact that the number of veins decreases. When stripping insulation from wires with monolithic or single-wire cores, another problem arises - the cores are notched ...

Compared to grounding systems such as TN-C and TN-C-S, the TN-S grounding system is particularly reliable and safe. This system appeared and began to gain popularity back in the 40s, having received the first wide distribution in Europe, where to this day it continues to remain deservedly in demand.

In Russia, the TN-S grounding system is also being used more and more often, and year after year it is increasingly competing with other, less reliable, grounding systems, since it is considered today the safest and highest quality of all known approaches to grounding in consumer power networks, especially in residential buildings. Despite the fact that the cost of installing the TN-S system is more expensive than the rest (just because of the need to lay more expensive multicore cables), nevertheless it is chosen on the basis of the requirement to ensure the greatest safety ...