Construction of the central building of MOU Ozerenskaya secondary school -EO

General Instructions

The scope of this project includes electrical lighting, power equipment, protective grounding and potential equalization.

Key project indicators:

1. Installed power - 64.173kW

2. Design power - 57.76kW

3. Power factor 0.9..

The process and plumbing parts of this project were the starting materials for the production drawings in this section.

Electrical solutions for execution of working drawings of this section are made in accordance with applicable codes and regulations specified on sheet 1.

According to the degree of reliability of power supply, consumers belong to category III, with the exception of current collectors, which belong to category 1.

Power supply of the building is performed according to the customer's assignment for design and architectural and construction plan.

The mains voltage is 380/220 V with the transformer dead-grounded neutral.

Electrical power equipment

VR1D250100 is accepted as the introductory device, VR1D400227 is accepted as the switchgear. Introduction switchgears are installed in electric board, which is located on the 1st floor. Power metering is provided by active energy meters installed on the introductory panel VV1D250100.

Power current collectors are electric motors of fans, pumps and technological equipment of the dining room.

Boards and points are fed from the building switchgear.

Modular enclosures with VA type circuit breakers are adopted for power distribution. Magnetic starters of PML type are used as starting equipment for current collectors, which are not supplied with the starting equipment.

Supply and power distribution networks are made by IWGng cable in vinyl plastic and steel pipes, in corrugated pipes, in furrows of walls and partitions, hidden under plaster, in floor preparation.

Lightning protection.

To protect the building from direct lightning strikes, according to RD34.21.12287 and SO 15334.21.1222003, a lightning protection device is provided on the building. Lightning protection is performed according to category III. Use the metal roof of the building as a lightning receptacle. The current leads from the metal roof should be laid to the grounding wires at least 20 m later along the perimeter of the building. Current leads laid along the external walls of the building on pins should be located no closer than 3 m from the entrances. Use the external grounding circuit as the ground point.

The connection of the lightning receptacle with current leads is made using a bolted connection with a transition resistance of 0.05 Ohm. Connections of lightning connectors with grounding conductor shall be made by welding. Lightning bolt shall be made of steel reinforcement wire D 10mm.

Electric lighting

The design provides for working and emergency lighting (safety lighting), emergency lighting lamps - "Exit" indicators are taken into account in the fire alarm design. Emergency lighting fixtures are separated from the number of working lighting fixtures and are equipped with BS 4KM58-41-1B emergency power storage units. The project provides for the disconnection of lamps in rows parallel to the light openings.

For air disinfection in the kindergarten premises, bactericidal irradiators of the combined type are installed. The upper shielded lamp is controlled by a switch installed in the room where the BW is located, and the lower (open), designed to decontaminate air and surfaces in the room in the absence of people, by a switch located outside the room, at the entrance to it. At the same time, the switch controlling the open lamp must be interlocked with a signalling device - a light indicator installed at the entrance to the room: "Do not enter! Bactericidal lamps are on "(AOT.OPL118 type lamp)

Group lighting guards are accepted the SRVP series on 12 groups with automatic BA47 switches.

Luminaires with fluorescent lamps and incandescent lamps are provided to illuminate the premises of the building. The illumination values are accepted in accordance with the current standards, the type of lamps and the power of the lamps in them are accepted on the basis of lighting calculation.

Maintenance of lamps is carried out from ladders, stairs.

Group Power Supply Networks

Group lighting networks are made three-wire (phase - L, zero operating - N, zero protective - PE conductor) cable of the brand:

IWG - hidden in furrows of walls and partitions, in cavities of slabs

IWGng - attachment with braces in fire hazardous rooms.

Cable sections are selected in accordance with PUE taking into account requirements for maximum permissible heating, voltage losses and compliance of received sections with currents of protection devices.

Differential switches are provided in the group lines supplying the sockets. Branch of protective conductor to each plug socket is performed in branch boxes. Serial connection of grounding contacts of plug sockets to group grounding conductor is not allowed

Installation height from clean floor level:

- for group boards-1.5 m;

- for socket sockets - 0.8 m; in places where children stay - 1.8 m;

- for switches - 1.5 m; in places where children stay - 1.8 m;

- for launchers - 1.5 m.

Differential switches are provided in the group lines supplying the sockets. Branch of protective conductor to each plug socket is performed in branch boxes. Serial connection of grounding contacts of plug sockets to group grounding conductor is not allowed

Installation height from clean floor level:

- for group boards-1.5 m;

- for socket sockets - 0.8 m; in places where children stay - 1.8 m;

- for switches - 1.5 m; in places where children stay - 1.8 m;

- for launchers - 1.5 m.

Grounding and protective electrical safety measures

Lightning protection

To protect against electric shock, the following measures are provided in case of indirect touching:

- protective grounding;

- automatic power-off;

- potential equalization.

The neutral grounding system in the project is TNCS. According to PUE2002, item 1.7.17, metal current-carrying (conductive) parts of electrical equipment are connected to the grounded neutral of the power supply by means of zero protective PE-conductors

The design provides for the main and additional earthing and potential equalization systems. The main potential equalization system connects

the following conductive parts are interconnected:

- grounding conductor connected to the external grounding circuit;

- metal parts of centralized ventilation systems. In decentralized ventilation systems, metal ducts should be connected to the PE bus of the fan power boards;

- grounding device of lightning protection system;

- metal pipes of utilities entering the building;

- zero protective PE-conductor of the supply line;

- conductor of protective armor of supply cable PV335 mm2;

Additional potential equalization systems connect all simultaneously touchable open conductive parts of stationary electrical equipment and third-party conductive parts within reach (up to 2.5 m), including protective conductors of plug sockets.

As zero protective conductors, additional wires and conductors of the electric network are used.