The machine in the shield does not turn on: the apartment, the causes of the malfunction and its elimination. How can I extend the life of circuit breakers in the panel. How to check the operation of the machine in the switchboard.

Do-it-yourself voltage control circuit BT136 600e. Advantages and disadvantages of triac and thyristor voltage regulator inductive load. Purpose of application of voltage regulators.

Voltage indicator: unipolar, bipolar, contactless and sound. Purpose and rules for using voltage indicators. How to use a voltage indicator up to 1000V. Features of a homemade voltage indicator.

Calculation of lighting by area: the number of lamps and fixtures. How to independently calculate the power of lamps for lighting a room up to 20 sq.m. Features of the calculation of LED lighting in residential premises.

How to connect a sconce with a switch with a cord: wiring diagram, installation steps. What is needed to connect a wall lamp with a switch on a rope. The main connection methods. The choice of the location of the wall lamp.

Electric meter "Matrix": device, single-phase and three-phase meters. The main and additional functions of the Matrix electricity meters. Is it possible to save electricity using the Matrix metering system?

Three-tariff electricity meter: time for different tariffs, pros and cons. In what cases is it advantageous to install a three-tariff electricity meter. Service of three tariff meters. How to take readings from a three-tariff meter with different tariffs.

Transformer for LED lamps 12 volts: differences from the power supply, purpose. Technical parameters of electronic transformers for LED lamps. Why a transformer, if you can install lamps at 220 volts.

Breaking capacity of the machine: what it is and what it affects. Features of circuit breakers that determine the breaking capacity. Rated breaking capacity of the circuit breaker.

How to connect an electric bell in an apartment: device and principle of operation. Wiring diagram for an electric bell in an apartment. Features of connecting wireless calls: range. Doorbell setup.

Overvoltage protection: connection scheme in single-phase and three-phase networks. What are the causes and the danger of power surges. Types and principle of operation of protective devices against surge surges.