Which voltage stabilizer to choose in the metering unit of thermal energy?
Advise you to choose a voltage stabilizer in an apartment building (about 200 apartments) to stabilize the voltage on a common house heat sensor (meter).
Why is the alarm lamp blinking instead of constantly on?
There is an alarm, after turning it on, when activated, a light should light up along with the sound, but it blinks, and does not constantly light. What is the reason?
Cracks wiring in the wall after puttying
He spent the wiring old and new, connected with ordinary white connectors. After puttying, it bursts and the light does not go out. To leave? Will it dry out?
Which electrical installation is considered valid - the correct answer
What is an existing electrical installation in accordance with the rules of PTEEP and MPBEE. Definition of the concept and examples of the correct answer to the question in different situations.
Is it possible to connect an SPD only to phase and zero?
Is it possible to connect an SPD protection device (SPD), only to phase and zero, after a circuit breaker at the entrance to the house? There is no grounding in the house.
How to connect the electromechanical timer ABB AT3-R with the temperature relay RT-820M?
How to connect the ABB AT3-R timer and the RT-820M temperature relay with the pool circulation pump so that the pump switches on in time and when the water temperature drops.
Why does an overload automaton knock out during overload, and not a group one?
When 2 heat guns are plugged into the outlet, an automaton that stands on a support is knocked out, and not an ABB S201 C16 submachine gun is connected in a separate group. What should be done?
Why does the circuit breaker knock out when the chandelier is working?
We screw 5 bulbs of 40 watts into the chandelier. After some time, the machines turn off. What could be the problem? Or is it a lamp feature? Already the second chandelier is so.
Wiring diagrams of fluorescent lamps without inductor and starter
How to connect a fluorescent lamp without inductor and starter. A review of existing switching schemes, as well as videos that clearly show the process.
How to connect a refrigerator, a cooker and an oven to one 380 V terminal?
There is one exit from the wall (3 wires), which are used to connect the oven. Is it possible to connect an oven, a refrigerator and a cooking tap from this output?
How to connect a subwoofer in a car if there is no chip?
How to connect a subwoofer to a car. I do not have 2 * 3 chips, can I connect without it? There is an acoustic cable, remote cable, battery cable, ground.
Why does the LED lamp flash when turned on?
I connected the lamp directly to the network, the light began to flash, and very much, In other rooms I connect - everything is fine. What is the reason for the lamp blinking?
How to connect a power outlet if the wires are not known?
Three wires come to a four-pin socket. The indicator shows the phase; it does not light up on the other wires. How to connect a three-pin socket now?
Is the installation UZM-51m 63A permissible if the introductory machine is 25A?
Is it possible to put a voltage relay UZM-51m 63A on an apartment, where the input circuit breaker is 25A? If not, then which one? Thanks in advance!
What is the difference between a transformer and an autotransformer
The main difference between a transformer and an autotransformer. What is the difference between these two devices. Comparison of the principle of operation, design and scope.
Why does one outlet in the room not work?
After the complete repair (the builders were engaged), I discovered that one outlet did not work. Maybe the builders killed that? Where to look for a malfunction and what to do?
What materials are needed for wiring
What materials are needed for electrical work in an apartment and a house. List of minimum consumables and protective devices for electrical installation.
GOST 2.755-87: Graphical symbols in electrical circuits. Devices switching and contact connections.
The status of GOST 2.755-87 for 2018. Graphical symbols in electrical circuits. Devices switching and contact connections. Download the document in PDF.
