Why can a broken common ground wire in the access electrical panel cause an increase in the mains voltage? How is this dangerous? How to avoid this?

Overvoltages in a household electrical network are not uncommon. Instead of rated 220 volts, much more can happen in apartment outlets. There can be many reasons for this, but the most common one is a break in the common zero working wire in the access switchboard.

Residential apartment buildings are usually powered by a three-phase 380 V network with a dullly grounded neutral. This means that at the entrance to all floors stretch “risers” - vertically laid wires of large cross-section. There are at least four such wires - three phases and a working "zero" ...

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 ...

The article describes the various types of metal detectors (hand, arch, soil) and the principles of their work. Their advantages and disadvantages are considered.

Very often during repair and construction work it is necessary to determine the exact location of the fittings, wiring in the walls and floor. After all, it is almost impossible to drill fittings in the wall, and damage to the electrical wiring threatens at best a serious accident, or even electric shock.

When excavating, there is the same problem - to find out the exact location of the various underground utilities. The same cables or pipelines. Here you can’t do without special equipment. Hand-held metal detectors will help you cope with the first task ...

If your electric extension cord stops working, do not rush to throw it away. It can be easily repaired without the knowledge and diploma of an electrician.

First you need to determine what the malfunction is, in the plug, in the cable or in the block with sockets.

Most often in extension cords, a strand breaks in a cord. In order to find the location of the fracture and repair the extension cord, we need any consumer that shows when it is turned on, when not. It can be a table lamp, a radio receiver or the same charging to a mobile one if it has a power indicator (most often a red LED). We turn on the consumer, and begin to bend the wire in different directions every five centimeters, starting from the plug ...

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? ...

The article provides simple tips for extending the life of energy-saving lamps and restoring burned out ones.

Energy-saving lamps are increasingly entering our lives. They really save energy, but they do not always justify the money spent on their purchase. This is due to premature lamp failure. Do not rush to part with her - often by simple manipulations it is possible to extend her life.

An energy-saving lamp consists of two parts: a luminous bulb and an electronic ignition circuit hidden inside the case. The secret is that it is extremely rare for both components to fail at the same time. As a result, it is often possible to assemble one working lamp from two faulty lamps ...

Why is aluminum gradually removed from everyday life when installing electrical installations? Why is he bad and dangerous?

According to the requirements of the 7th edition of the Electrical Installation Rules (PUE), aluminum wires and cables with a cross section of less than 16 square meters. mm are not allowed for use during installation. But what is the reason for this? Why is aluminum so bad that has served the electricians faithfully for many years?

To answer these questions, you need to recall something from physics and a bit from the school chemistry course. What properties does aluminum have as a material? First of all, it is, of course, light. This is an undeniable advantage ...

The article lists the main advantages of electronic ballasts over obsolete counterparts.

Ceiling and wall lamps with fluorescent tube lamps have long been in service in various office, office and residential buildings. In appearance, in terms of the number of installed lamps and their power, these lamps are characterized by a wide variety. This explains their widespread popularity. But until relatively recently, people had to put up with some of their shortcomings.

The fact is that a fluorescent lamp cannot be directly connected to the network, for operation it needs certain conditions for supplying voltage and current control. This problem is solved by ballasts for fluorescent lamps ...