Each apartment has an electric meter installed - a device for metering electricity consumption. When a user enters into a contract with a company that supplies electricity, the purchase and installation of a meter is obligatory. Without this device in this situation can not do.
Installation of electricity meters can be carried out by a qualified technician. But this is not always possible, and the installation procedure itself can be carried out by the user. Given the fact that you can always find detailed instructions describing the entire installation, even a less experienced user will be able to install an electric meter.
The article below will tell about the installation of different types of electricity meters, as well as some of the nuances of this process.
- 1 Installation of single-phase electricity meters
2 How to connect a three-phase meter
- 2.1 Direct connection of the three-phase electric meter
- 2.2 Indirect connection of the three-phase electric meter
3 Tips for installing a meter in the dashboard
- 3.1 Wiring diagram
Installation of single-phase electricity meters
Electricity meters can be single phase and three phasedirect and indirect inclusion. We will not interfere with everything in a heap, so it is best to start with single-phase and so on, considering each connection of each type of meter in more detail.
In order to install a single-phase electric meter, you need to take into account that such a device is connected directly to the break in the power supply line. We must not forget that before connecting the meter to the network, no devices that consume electricity should be connected. It should also be remembered that an input circuit breaker should be installed. This is done so that there is protection of the power supply line in front of the meter. The switch will be very useful in the case when the counter will change. Its presence will avoid de-energizing the entire supply line.
In order to protect and outgoing line, you should take care to stop the circuit breaker and after the counter. It will also allow protect the meter in case of malfunctions with other consumers of electricity.
When installing the meter, you should carefully consider the wiring diagram. Usually this circuit is located on the terminal cover, on its back side.
It must be remembered that single-phase electric meters have four terminals for connection:
- Input phase wire.
- Input zero wire.
- Output phase wire.
- Output zero wire.
You may notice that remember all the terminals is not difficult. The power wires going after the input circuit breaker must be connected to terminals 1 and 3, after stripping the wires from the insulation by about 15 mm. Stripping wires should also be stripped. connect to terminals 2 and 4that completely corresponds to the scheme of connection located on a cover of the electric meter.
The above scheme for connecting electricity meters is suitable for garages, country houses and apartments in high-rise buildings.
How to connect a three-phase meter
In order to install a three-phase meter, you can use one of the available connection options. There are only two such options: direct connection and indirect. Each user is free to choose exactly the method of connection, which will seem to him more convenient and priority.
If it is necessary to take into account the consumption of a relatively small number of low-power three-phase consumers, the electric meter should be installed in the rupture of the power wires.
In another case, when it is required to take into account and exercise control over sufficiently powerful three-phase consumers whose currents exceed the nominal values, it is necessary to install additional current transformers.
If the user is considering installing an electric meter for a country house or his small production, in this case, you can install only one counter, which will be calculated on the maximum current up to 50 amps The connection of such an electric meter is very similar to the connection of a single-phase meter, described above, only with the difference that in this case when connecting a three-phase meter three-phase power network is used. From all this it follows that a three-phase electric meter will be equipped with a large number of terminals.
Direct connection of the three-phase electric meter
First you need to strip the conductive wires from the insulation, after which they need to be connected to a three-phase circuit breaker. After connecting to the machine, the wires must be connected to terminals 2, 4 and 6. Output phase wires, respectively, by connecting them to 1, 3 and 5 terminals. To terminal 7 you need to connect the input neutral wire, and the output one already to terminal 8.
To ensure protection, install circuit breakers after the meter. The presence of three-phase consumers suggests installation of three-pole machines.
In principle, single-phase, more familiar, electrical appliances can be connected to three-phase meters. To do this, you need to connect a single-pole automaton from any outgoing phase of the meter, while the second wire must be taken from the neutral bus grounding.
When several groups of single-phase consumers are installed at once, it is necessary to ensure their uniform distribution by powering the switches after the meter from different phases.
Indirect connection of the three-phase electric meter
There are cases when the consumed load of all devices that consume electricity exceeds the nominal value of the current that is able to pass through the meter. In such cases, you must install additional current transformerswhich installation is carried out in a rupture of power current-carrying wires.
Such a transformer is equipped with two windings. The primary winding is represented as a tire, quite powerful. It is passed through the middle of the transformer and is connected to the break in the power wires of the consumers. The secondary winding is connected directly to the meter itself. It is equipped with a large number of turns of thin wire.
Such a connection, using current transformers, is much more complicated than the usual direct connection, which was described above. To perform such a connection requires certain skills, as the user without experience will face difficulties, which may lead to unnecessary risks. Therefore, it is recommended in this case to call a qualified specialist who can correctly and without problems connect the three-phase electric meter with current transformers. But in the event that the user has already a certain skill and is confident that he can handle it himself, then you can do everything yourself.
For such a connection you need to start connect three transformers, each of which will relate to its phase. Usually current transformers are attached to the rear wall of the input cabinet. The windings of transformers are connected after the input knife switch, as well as a group of protection fuses, into the break of the power wires of the phases. It is in the same cabinet that a three-phase electric meter is installed.
The above diagram is a necessary schematic representation of the connection with current transformers.
First you need to take the power wire of phase A. It is necessary to connect to it, to the installed transformer, a wire with a certain cross section of 1.5 mm squared, while the second end of this wire should be routed to terminal 2 of the electric meter. To the remaining phases B and C you need to connect wires with the same cross section. On the meter, they are connected to terminals 5 and 8, respectively.
From the terminals of phase A of the secondary winding of the transformer go the wires with the same cross section, which connect to terminals 1 and 3. Be sure to remember that there is an urgent need to track the correct phasing of the connection, since incorrect phasing will lead to inaccurate meter readings. The secondary windings of transformers B and C are connected in the same way to terminals 4, 6 and 7.9, respectively.
The terminal 10 of the meter is connected to the common neutral grounding bus.
Tips for installing a meter in the dashboard
Every user knows that on his landing there is a special registration shield, in which Electricity meters are located, which take into account the electricity consumed by all by the floor. In order to install the meter in such a panel should know a few rulesthat will help in the implementation of this procedure.
To install an electric meter, you first need to:
- Prepare the tools that are exactly needed during the installation of the meter in the switchboard. Be sure to need the following tools: pliers, nippers, screwdrivers, insulation, insulation strippers and others.
- Then you need access to the input switch in order to be able to subsequently disconnect from the network the lines of the entire floor.
First you should do power line spurs, for which it is necessary to strip out insulation, using for this purpose special tongs, main wires, which must be previously de-energized. This place is placed on the terminal strip specifically for branching wires. After the user installs this terminal block on the main wire, he must connect the lead wire, which will have to go to the input circuit breaker.
The branch from the neutral conductor is made in the same way.
Then you need to install all protective devices, as well as the meter itself, on the panel of the shield. After installing all of these components in their places you need to connect all the necessary wires.
The above described branch of the main phase wire must be connected to the input automat, from whose output the wire is connected to the first terminal of the meter. A circuit breaker will not be needed for a branch neutral wire connected to the second terminal of the instrument.
The wire diverges group protection machines energy consumers. Connect the wires from the fourth terminal to the common bus grounding. By the way, all zero wires of consumers must be connected to the same bus.
From the apartment itself there are wires of the phase, which should be connected to the circuit-breakers installed after the electric meter. It should be remembered that a separate circuit breaker is required for each phase wire. In no event it is impossible to carry out connections of all phase wires to one automatic machine.
You should know the fact that all the neutral wires that come from groups of energy consumers, you need to connect to a common bus vanishing.
It is very important to adhere to the scheme attached above. This will help ease the installation.
Advice to userswho will install the meter in the switchboard on their staircase:
- Be sure to remember that you do not live alone in the stairwell. There are other users who are also happy owners of an electric meter installed in the panel. To avoid possible confusion, it is recommended that all circuit breakers that you have installed be numbered. Otherwise, you may encounter unpleasant comments from your disgruntled neighbors.
Installing the meter in the garage is done in exactly the same way, with only one difference: that in the garages there are ready-made separate power supply wires, which means uselessness in the implementation of the branch wires.
If you follow all the instructions and tips, as well as the available wiring diagrams, the installation electric meter will not be difficult, even for a user who does not have certain skills and due experience. Too much difficulty, this installation does not imply.