St. Petersburg, Petrodvorets, St. Petersburg Ave., 7, lit. A - power supply

1. Power supply

Supply voltage ~ 380/220V, transformer neutral is grounded tightly.

The category of reliability of power supply is the third.

Power supply is provided in a separate design from one power supply (TP 115).

Power network and general working lighting of an individual residential building are provided for voltage ~ 220V.

Design loads of electrical consumption: Rust. = 27.06 kW, Rach. = 14.92kW, Sach. = 15.06 kVA.

2. Electric equipment

In the house, an accounting and group board (hereinafter referred to as a power panel) is installed, in which ABB electrical equipment is mounted: an accounting device, circuit breakers with the "C" characteristic and differential circuit breakers. The installed equipment provides protection of the electrical installation against short-circuit currents, overload currents and leakage currents. The wall panel, IP43, is located in a separate room, the height of the installation is 1.2 m from the clean floor.

3. Organization of electricity metering

Three-phase dual-tariff counter ABB DFB 13205108 of Delta plus series of direct connection, rated voltage ~ 380V, base and rated currents of counter 5/80A are installed in the power board for active power metering.

4. Electrical wiring

The load of the house is electric lighting and power supply network.

The group electric network is provided with a cable of BBGngLS grade with copper cores that do not spread combustion, with low smoke and gas release.

Wiring shall be laid:

- basement, first and second floors - according to a closed scheme in corrugated PVC pipes behind the ceiling and wall cladding;

- on the attic is open along the walls in cable channels, behind ceilings in metal pipes, the pipes are connected to each other by thread or welding. Use metal unpacking and installation boxes for cable, switches and sockets.

All cable connections shall be made in the boxes by soldering, welding or using branch clamps (WAGO spring terminals or similar). Connection points shall be accessible for inspection and repair.

Cable passes through walls are made in sections of steel pipes with subsequent sealing of gaps by easily removable mass from non-combustible material.

The cables shall be coloured as follows:

- blue color for zero working conductor;

- yellow-green color for zero protective conductor;

- black, brown, red, purple, gray, pink, white for the phase conductor.

5. Artificial lighting and power network

The design provides for working lighting in all rooms.

Luminaires with fluorescent lamps and incandescent lamps are provided for lighting of rooms. In the bathrooms and at the entrance, lighting fixtures in the moisture-proof version, of the overhead type, are used.

The lighting level in the rooms is selected in accordance with the requirements of SanPiN 2.2.1/2.1.1.127803. The design adopted lighting fixtures corresponding to the characteristics of the environment of the illuminated rooms. The selection of the number of lamps is made in accordance with the purpose of the rooms and the required illumination by the point method.

Rated illumination, types, number and place of installation of recommended lighting fixtures are given on electrical illumination plans.

Switches are installed at the height of 1.0 m from the floor. Operating lighting control is provided by local switches.

Plug sockets are provided with bipolar with grounding contact, with protective shutters, installed at a height of 0.8 m from the floor.

The installation heights of the switches and sockets are specified after the release of the design design of the rooms.

6. Grounding and safety precautions

A TNCS ground system is adopted to power the designed electrical installation, in which 0.4 kV supply networks from the transformer substation to the switchboard of the house are provided with a combined zero working and zero protective PEN conductor, and group networks from the power panel to electrical receivers and sockets with a protective contact are designed with separate zero working N and zero protective PE conductors.

The power panel is equipped with a zero working bus N, isolated from the shield body, and a zero protective bus PE, connected to the shield body.

The main protection against direct contact with current-carrying parts of electrical equipment is provided by:

- main insulation of current-carrying parts,

- use of protective shells for electrical equipment.

Protection in case of indirect contact with open conductive parts (electric receiver housings) energized as a result of damage to the insulation of the current-carrying parts is provided by automatic switches with a thermal and electromagnetic disconnector installed in the power panel.

The time of protective automatic power cut-off complies with the requirements of item 1.7.79 of PUE.

In the group supply lines of bathrooms and kitchens, in the group line of the electric stove for additional protection against shock, protective shutdown devices (differential circuit breakers) with a nominal disconnecting differential current of 30 mA are used.

A protective shutdown device with a nominal disconnecting differential current of 300 mA is installed after the counter at the input of the power panel.

To avoid false positives, zero operating conductors N connected after the diaper. automaton, should not be connected to electric receiver housings.

Connections of zero protective conductors shall be available for inspection. Protection conductors PE of group cable lines should be connected to zero protective busbars PE of boards connected to metal housings of these boards.

Connect the phase conductors of the group network to the switches.

7. Capacity equalization measures

All metal parts of the electrical installation that are not normally energized (electrical panels, lighting fixtures, starting equipment, steel wiring pipes, etc.) shall be grounded by connecting them to the zero protective conductor PE of the electrical network.

The scope of design and installation works that ensure potential equalization in the electrical installation of the house includes:

- a grounding device including a grounding conductor and a grounding conductor;

- installation of main grounding bus of GZSH.

The following are attached to the GWN:

- grounding conductor from GZSH to grounding conductor;

- protective conductors of electrical installation ;

- the main conductors of the potential equalization system, laid from external conductive parts: metal structures of the building, metal pipes of engineering systems;

-PEN conductor of external supply line.

In accordance with paragraph 7.1.88 of the Rules for the arrangement of electrical installations of the seventh edition in bathrooms and bathrooms, it is necessary to perform an additional potential equalization system providing for metal connection between the protective contacts of plug sockets and third-party conductive parts (metal baths, metal pipelines). These connections are made in a plastic box with a copper tire mounted at a height of 0.30.8 m from the floor. Plastic pipes shall not be connected to the copper tyre.

From the boxes in the bathrooms to the power panel, it is necessary to lay a wire PV1 with a cross section of 4 mm2 hidden in the polyvinyl chloride pipe with an outer diameter of 16 mm and to connect the copper tire in the box with the bus PE of the power panel.

8. Lightning protection

The project provides for a lightning protection system for an individual residential building.

The object class is normal.

The level of protection against direct lightning strikes is III.

Reliability of protection against PUM0,9.

A lightning protection system based on DEHN equipment is envisaged.

The lightning receptacle is the metal roof of the building, to which a current collector is connected by means of special contact terminals for the roof flange. Connect the current collector to the roof above the ventilation product to ensure normal electrical contact between the roof coating. The current leads are steel wire with diameter 8 mm, which is attached to the roof surface with the help of metal holders. The current leads shall be lowered to the external grounding circuit along the drain pipes with clamps. Each lead shall have a reference point for measuring resistance at the point of entry into the ground. Make a reference point at each current collector drop at the level of 1000 m from ground level. In this place install the separation terminal, to which connect the current lead from the roof and the earth lead rod, which is inserted into the ground and attached to the steel strip of the external ground loop. At the points of connection of the earth lead rod, attach one vertical steel grounding conductor with a total length of 3000 mm (two sections of 1500 mm each). Protect clamps immersed in soil with anti-corrosion tape .

Along the perimeter of the building at a distance of 1 m from the foundation, lay an external grounding circuit made of a steel strip with a section of 40x4 mm laid in the ground at a depth of 800 mm.

The fireplace and ventilation pipes shall be incorporated into the lightning protection system by attaching the metal pipe cap to the metal roof using folding clamps and conductor holders on the pipe .

Attachment units and description of lightning protection elements are given on drawings of the main set of drawings (sheets 21, 22).

13. Organization of electrical plant operation

The limit of operational responsibility between the consumer and the power supply organization for the condition and maintenance of the electrical installation is established by the Act.

The consumer must ensure the serviceability of his electrical installation.

The consumer is not allowed to connect the electrical load in excess of the permitted in the technical specifications, as well as increase the nominal values ​ ​ of the protective devices.

All electrical equipment must meet the requirements of GOST and be of industrial production.

Depending on the category of premises, equipment and tools of the appropriate class of protection against electric shock shall be used in relation to the danger of electric shock.