Current transformers for electric meters: load calculation and purpose. Technical parameters of the current transformer for the electricity meter: rated voltage and current, accuracy class. Selection for a three-phase meter.

Wiring diagram in a two-room Khrushchev: how to change it with your own hands. How to make grounding in Khrushchev. Local repair of electrical wiring in Khrushchev. Features of wiring in Khrushchev.

Triple switch: design and connection features. The installation scheme of the triple switch on three bulbs. How to make a triple of a double switch. Connection of wires to the three-key switch.

How to connect a passage switch as usual and vice versa: wiring diagrams. How to make a passage switch from a two-gang switch. Is it possible to make an ordinary switch from a passage switch.

Color rendering index of LED lamps: concept and comparison with other types of lamps. The disadvantages of the color rendering coefficient of LEDs and their solutions. Recommended CRI values ​​for LED lamps.

On which side of the outlet is the phase: does it matter where the phase is, and where it is zero. Determine the phase and zero in the outlet using a multimeter or indicator screwdriver. Which socket should have the phase in the outlet?

How to make grounding if it is not in the apartment: why is it needed. Grounding in an old-built apartment block. Existing grounding systems. Where to get grounding in a panel house.

Socket with a remote control: how it can be used and why remote control is needed. Methods for remote control of the outlet: mechanical and radio control, by wire and acoustic method.

Voltage relay: description and scope of the protective device. Connection diagram of the voltage monitoring relay. The device and principle of operation of the voltage relay. Configuring overvoltage relay settings.

How to check the voltage in the socket with a multimeter: why do you need to measure the voltage. Where else besides the outlet you can check the voltage in the 220V network. How to connect a multimeter to a power outlet. What should be the voltage in the outlet.

Sconce switch: how to choose and which are better. Options for connecting a sconce through a switch. Design features of switches for sconces: on a lace, with a button and a passage. How to install a wall lamp switch yourself.