One of the most useful skills of any person professionally associated with the maintenance and repair of various electrical and electronic devices and devices is the ability to solder. In this article we will consider the basic concepts and rules that you must know before proceeding with the soldering itself. The main emphasis in the article is made on the consideration of safety rules when soldering.

Brazing is a method of joining metals using another, more fusible metal. The soldering process is the penetration of one substance (metal) into another at high temperature, which provides after hardening of the solder mechanical strength and high electrical conductivity of the connection. Soldering usually occurs at high temperatures of soldered surfaces and molten tin (from 180 to 250 ° C). In this process, one of the metals is the welded conductors, the second is solder ...

An isolation transformer is a transformer that is designed for electrical (experts say - galvanic) separation of the power supply network and the consumer of electricity. Consumers are us and why divide us? For safety!

The main task of the isolation transformer is to increase electrical safety due to the fact that its secondary circuits do not have electrical connection with the ground, and therefore with the grounded neutral of the transformer substation - a voltage source.

In this case, the occurrence of an electrical breakdown on the case does not cause overcurrents, and the device itself remains in working condition. If a person accidentally touches a part of the device that is accidentally energized, the leakage current will not exceed a life-threatening threshold and tragedy will not happen ...

Getting hit is very unpleasant. And the most painful are blows from those from whom you do not expect aggressive behavior, who, on the contrary, are called upon to create coziness and comfort in your home. For example, how do you like it if your washing machine starts to fight?

Meanwhile, when included in a two-wire line, this is possible even for an absolutely functional washing machine. The reason is the features of the built-in mains filter located at the input of electrical power. The filter consists of two capacitors with a common point on the machine body. One capacitor connects the housing and the phase wire, and the other connects the housing and the neutral wire.

Manufacturers of modern washing machines naively believe that their creations will be included only in a three-wire electric network with a separate ...

How many outlets in your apartment? Five? Ten? More? And how many of them are always free? I bet that at least half. What are they for?

These sockets are most often used to connect various portable power consumers. To distinguish them from the rest is quite simple: they can be connected anywhere, without really bothering - there would be a 220 volt outlet.

The most typical portable power consumers are hand-held power tools: a grinder, a drill, a hammer drill, and the like. Something needs to be done somewhere: they picked up the tool for carrying and worked in any conditions. The work is over - the tool is carried away in a long time, al will soon come in handy in a completely different place. But portable power receivers are not only a power tool ...

Many of us from childhood remember that a bare tattered wire that fell to the ground is very dangerous. I remember various passions-muzzles about wet weather and about unfortunate victims who did not even have “happiness” to touch the metal, which was energized and caused their injury. All in all, they managed to pass in dangerously close to the damaged line - and this was more than enough.

But what kind of phenomenon is this, thanks to which a wire that lies “innocently” lying to one side becomes a deadly threat? Everyone knows that an electric shock to a person can only be caused by an electric current passing through his body. And electric current needs a clear path. At least two points of application on the body of the unlucky one are necessary: ​​one of them is the phase from where the current can come, and the second is zero, where it can freely go ...

Electrical engineering is an exact science and here, unlike such ephemeral areas of human activity as, for example, design, there are clearly documented norms and rules (PUE, GOSTs, instructions), and not just “like” or “don't like”. Yes, PUE is “the bible of an electrician” and the formidable phrase “read in PUE” speaks of the importance, pumpability and great seriousness of those who said it.

But it turns out in life is always much more complicated everything is arranged than it is written even in the wisest books and these books can be interpreted in different ways. Particularly heated discussions among electricians in electrical forums raise questions related to the grounding of electrical installations and the installation of residual current devices (RCDs). It so happened that in our time in everyday life there are simultaneously two grounding systems TN-C and TN-C-S ...

In cases where a person has been exposed to electric current, emergency action is necessary. What are these actions, and how to perform them, we will tell in order.

If the victim is under the constant influence of an electric current, first of all, by any available means, he must be freed from this effect, breaking the person’s contact with electricity. After all, the longer the duration of the current exposure, the worse the consequences.

The easiest and safest way is to simply turn off the circuit breaker or machine. But, unfortunately, this method may not be the fastest, since the electric shield can be located quite far away, or even out of the reach of a saving person ...

Each of us, of course, had to turn on the light bulb, repair the burned cord on the iron, and tighten the contacts in the outlet. Moreover, it is not necessary to have a special electrical engineering education. About the same as it is not necessary to know to the smallest detail the device of an internal combustion engine in order to become a car enthusiast.

It is exactly the same with electricity: it is completely optional to invite an electrician from the ZhKO to replace an unusable switch or socket. But at the same time, you need to know the danger of electricity, and what rules must be observed so as not to lose forever the desire for such work. First you should get acquainted with the rules of electrical safety. So why is electricity dangerous to the human body? ...