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Input-distribution device ASU

Input-distribution device ASU

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Technical characteristics
  • BrandКасКад энерго, ОДО
  • Country of manufactureBelarus
  • GTIN-

VRU - Input - switchgear of the house   VRU Input - switchgear (VRU) of a private house.

An input distribution device (ASU) is a special electrical device with devices and devices installed in it. In contrast to the input device (WU), in the input - distribution device, not only the reception, but also the distribution of electrical energy takes place among the electrical groups inside the house. An introductory switchgear is installed at the input of the power cable, usually in the house or in the annex to the house.

Input distribution device in a private house

If the house is large and there are several separate power supply inputs, it is recommended to install separate input distribution devices (ASU) for each input to the house.

Also, if there are several additional buildings on the territory of the site, it is allowed and logical to install additional switchgear (RU) after the main input - distribution device in each building.

For a private house, so - called cabinet ASUs are installed. In such an ASU, all the necessary devices are installed in a cabinet - type case.

Complete set of input - distribution devices for home

I will give an example of a complete set of an input - distribution device for an average private house

  • Two copper busbars: PE busbar and N busbar (1);
  • Input circuit breaker or group of fuses (2);
  • Arrester (voltage limiter) (3);
  • Metering unit with an electricity meter (4);
  • Group of circuit breakers for single - phase group networks at home (5);
  • Block of automatic distribution networks;
  • Stackable terminal blocks for switching network wires and the wires themselves.

Let's analyze each element of the ASU in more detail

Copper buses for connecting PE and N conductors in the switchgear of the house

All wires are connected to the PE copper bus using bolts, washers, nuts and lock washers. The connection must be done with a tool and not by hand.

The PE copper bus must be provided with connection points

  • Input PEN wire, with TN - CS house power system ;
  • Grounding conductor from the grounding of the house;
  • Conductor from the equipotential bonding system ;
  • Wire from the arrester (voltage limiter).

Copper bus N is designed to connect the neutral working conductors of the network at home

In the input - distribution device (ASU), the PE and N buses are interconnected, but according to certain rules.

Connection of PE and N buses in the ASU at home

Let me remind you that I am considering the ASU at home when the power is connected according to the TN scheme , with a dead - grounded neutral.

The tires are mounted inside the ASU next to each other. According to the recommendation in GOST R 51732 - 2001 (VRU), the zero working bus (N) should be located below the PE bus, but, in my opinion, this is not of fundamental importance. This is fundamentally different.

Important! The PE bus must be fixed to the ASU body using bolted connections and with a conductive contact. The N bus must be fixed on the ASU body through dielectric (non - conductive) insulators.

The PE and N busbar must be connected with two jumpers at the edges of the busbars or one jumper in the middle. The cross - section of the jumpers must not be less than the cross - section of the protective PE wires. The connection must be bolted.

The PE and N buses must be marked with a color or with plates with the inscriptions PE and N. The wires outgoing from the buses must have the color according to GOST R 50462: protective PE wires in green - yellow, neutral working wires N in blue.

Introductory machine VRU

The power cable is connected to the input ASU machine. The rating of the machine is selected according to the electrical project. An introductory circuit breaker is designed to protect the electrical wiring of the house from overload and ultra - high short - circuit currents, as well as deliberate power outages for maintenance of the house network. Instead of an input machine, it is possible to install fuses.

Arresters (voltage limiters)

The arresters are installed after the input automaton. Through them, the phase conductors are connected to the PE busbar. In case of impulse overloads, the arresters are triggered. The phase voltage enters the PE bus and the ASU protection is triggered.

Blocks of automatic machines for electrical groups at home

These circuit breakers are designed to distribute power to electrical wiring groups at home. For each electrical group of the house (kitchen, bathroom, rooms, lighting, etc. ), a separate circuit breaker is installed. If necessary, residual current devices (RCDs) are installed

Switchgears must be installed in such a way as to evenly distribute the load between the phases. The number of machines for each phase must be calculated taking into account the demand factor. The demand factor determines the likelihood that all power grids are woken up to the maximum load. ( Read about the demand ratio in detail ).

Wires for switching in ASU

  • The wires must be multi - colored according to GOST R 50462. PE - yellow - green, N - blue, phase L - red.
  • The wires of the internal networks of the house at the ends must be marked with inscriptions or plates.
  • It is advisable to paint phase buses in different colors or sign L1; L2; L3.
  • All wires must be insulated Insulation must be rated for 660 volts. When laying wires inside the ASU, they should not touch the conductive and sharp parts of the case. At the input to the ASU, they must be protected with bushings.

Everything about the internal structure of the ASU. It remains to tell about the marking of input distribution devices (ASU)

Switchgear marking

Like any electrical device, the input distribution device (ASU) has a special marking in accordance with Chapter 4, GOST 14254 - 96.

According to the table below, you can decipher the marking of any ASU, including ASU for a private house.

Normative references: GOST R 51732 - 2001 (VRU), PUE, Electrical installation rules, edition 7, GOST R. 50462 "Wire color identification"

Input - distribution device From Wikipedia - the free encyclopedia

Input - distribution device (also UVR, from Input - Distribution Device ) - a set of electrical structures and devices designed for receiving, distributing, backing up and metering electrical energy, installed in residential and public buildings, as well as industrial production premises (workshops).

7.1.3. Input device (VU) - a set of structures, apparatus and devices installed at the input of the supply line to the building or to its isolated part.

The input device, which also includes the devices and devices of the outgoing lines, is called the input - distribution device (ASU).

Electrical Installation Rules (PUE). Chapter 7.1. Electrical installations of residential, public, administrative and household buildings

Cables from transformer substations of reserve power sources to input - distribution devices must be laid in separate fire - resistant ducts or have fire protection.

For the power supply of electrical consumers of fire protection systems, it is necessary to have independent input - distribution devices located in each fire compartment.

VRU of a residential (public) building

The ASU of a residential and / or public building is intended for use in a network with a voltage of 380/220 V three - phase alternating current with a frequency of 50 Hz in networks with a solidly grounded neutral, to protect lines during overloads and short circuits, as well as for infrequent (up to 6 starts per hour) operational switching on and off of electrical networks and is usually a grounded metal cabinet of protected design, inside which there may be appropriate equipment: circuit breakers , fuses , electricity meters , emergency input panels , phase control relays, emergency lighting switch, phase load distribution sensors, voltmeters and ammeters . An indication of the main parameters of the electrical network can be displayed on the door of the ASU: voltage, current, operation of protections, phase asymmetry, etc. Ammeters and energy meters are switched on through current transformers .

The entry of cables and wires is provided from the bottom of the cabinet, the output is from the bottom or through the top removable cover. The maximum number and cross - section of conductors of wires and cables connected to one input terminal of the ASU installed in public buildings and / or high - rise buildings - 4 × 150 mm 2

In the USSR, VRUs were often completed with standard input panels VRU - V1 - VRU - V3 and distribution panels of the VRU - 12 - VRU - 24 type. The cabinet - type panels were supplied with the hardware installed, with all internal electrical connections and inter - panel wires. Overall dimensions of all panels: 1 700 × 800 × 500 mm.

ASU premises of an industrial enterprise

Room availability

1.7.72. In electrical rooms of electrical installations with voltages up to 1 kV, protection against direct contact is not required if the following conditions are met simultaneously:

  • these rooms are clearly marked and can only be accessed with a key;
  • the possibility of free exit from the premises without a key is provided, even if it is locked with a key from the outside;
  • the minimum dimensions of the service aisles correspond to Ch. 4.1
  • General requirements for switchgears and low - voltage complete devices with voltages up to 1 kV AC and up to 1.5 kV DC, stationary switchgears and alternating current transformer substations with voltages above 1 kV are specified in chapters 4.1 and 4.2 of the Electrical Installation Rules (PUE).

Input distribution device

Input distribution devices (VRU) are designed for the reception, metering and distribution of electricity in electrical networks with a solidly grounded neutral, with a rated voltage of 380/220 V and a frequency of 50 Hz. Also, these devices provide protection of outgoing lines from short - circuit currents and overloads. Depending on the features of the performance, they can be installed both on the floor of residential and various administrative premises (floor construction), and outside them. Input distribution devices without metering devices are produced in a housing with one door.

Input - distribution devices UVR - N02 are manufactured in accordance with TU of the Republic of Belarus 100086913.001 - 2002. The design of devices for resistance to mechanical stress is in accordance with GOST 17516.1, corresponds to group M1. Degree of protection of devices according to GOST 14254 - IP30, bottom side - IP00. Input - distribution devices installed in switchboard rooms can be produced with a degree of protection IP20. At the request of the customer, it is possible to manufacture devices with a degree of protection IP54.

Regardless of the degree of protection, ASPs must be operated in a fire and explosion - proof environment that does not contain corrosive gases, vapors and conductive dust in concentrations that reduce the parameters of the product (GOST 15150 - 69). The recommended installation height above sea level is no more than 1000 m.

The ASU delivery set includes:

  • input and distribution devices UVR - N02;
  • handle for replacing fuse - links (1 pc. for input - distribution devices with fuses);
  • keys to door locks (1 pc. for each lock);
  • passport;
  • technical and operational documents for component parts.

We manufacture input - distribution devices to order, according to drawings and diagrams provided by the client. It is possible to manufacture UVR with a degree of protection IP54, in a floor - standing or other required design.

The company's technical specialists will provide you with detailed advice and will tell you about the features of the operation of input - distribution devices, their performance characteristics. You can order the manufacture of devices in Minsk by calling the contact numbers indicated on the website, or by sending us an application by fax or e - mail.

ASU cases are available in the warehouse, check with the manager for a complete set.


We will manufacture the ASU body and the ASU frame according to the individual order, quickly and efficiently.

The frame of the ASU can be made according to the individual order within a day!

You can order the Input Distribution Device (ASU) by calling 8 017 388 07 67 or by dropping the application by fax or e - mail: kaskadenergo@mail. ru


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Обращались в Каскад энерго по вопросу обустройства канализации и водоотведения. Нам предложили станцию Кристалл-5 и помогли организовать монтаж системы очистки. Станция работает уже 4 года без нареканий. Качество очистки отличное, вода на выходе прозрачная без запаха как и обещали, Поначалу думал что много денег отдал за такую канализацию, но пожив четыре года, посмотрел как соседи мучаются со своими бетонными кольцами и понял что сделал правильный выбор. Чистил станцию всего 3 раза за это время, самостоятельно. Процесс простой и занимает 30 минут времени. Канализацией Кристалл и своим выбором доволен. Рекомендую!
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