Training center power supply

General part

This project is based on the design assignment and specifications,

The electrical part of the project is performed in accordance with the current regulatory documents:

• "Electrical Installation Rules" PUE98;

• "Design and installation of electrical installations of residential and public buildings" SP311102003;

• "Natural and artificial lighting" SNiP 230595;

• "Instruction on lightning protection of buildings and structures" RD. 34.21.12287

This project involves the development of the following parts of the project:

• power electrical equipment;

• general design scheme is given;

• internal electrical lighting;

• grounding and lightning protection of the building;

• Safety issues have been resolved.

The power supply source is the existing transformer substation TP No. 1, located on the territory of _____

According to the degree of reliability of power supply, the training center belongs to consumers of category II .

Power supply of electric receivers is provided by voltage U ~ 380/220 V. TNCS system.

0.4 kV cable line

From RU0.4 kV TP No. 1 to the training center, two supply cables (operating and standby) were laid. The cable was adopted as VBbShv0.66 with a section of 3x95 + 1x50 mm ² with laying in a trench.

The depth of cable laying in the trench is 0.7 m from the planning elevation of the ground. The distance between cables is 100 mm in the light. The minimum bending radius of cables is 320mm. Prior to the commencement of work, clarify the intersection of the projected cables with the existing communications .

Cable entry into buildings is performed in pipe sections with sealing.

Cable section is selected by long-term permissible current load and checked by voltage loss of ∆U<5%.

Power electrical equipment

At the entrance to the training center, an introductory switchgear of the VR8503E type is installed in the electrical switchgear room. Three-phase meters "Mercury 230A" with accuracy class 1.0 are installed in BRU to account for electricity.

As distribution power cabinets, devices of the MBD type installed in corridors, in the immediate vicinity of consumers, are adopted. As group lighting boards, shields of MBD type installed in corridors are adopted. In cabinets and boards, a circuit breaker is installed for each group of consumers, and an automatic circuit breaker with ultrasound is installed for socket networks.

As starting devices for the equipment the KME magnetic actuators, boxes of management Ya50000, complete control cabinets (for a sauna, the incoming systems, the pump equipment of the pool) installed on walls near consumers and in a distributive case of ShR2 are accepted.

Control of exhaust and plenum ventilation is carried out using control buttons located in the rooms where it is needed.

U ~ 380/220B distribution networks are made with a five and three-wire cable of BVGng0.66 grade hidden along walls and ceilings in shrobes, open along walls on brackets and in plastic cable channels. Vertical sections of lines are made in PVC pipes.

Electric lighting

The lighting of the premises is accepted in accordance with SNiP230595.

The project provides for three types of lighting: general, emergency and repair.

Food of network of lighting of rooms is executed from guards of illumination of ShchO1ShchO7. Lighting networks are protected using circuit breakers installed in boards on DINrakes.

Luminaires with fluorescent lamps, filament lamps and DNaT lamps are used for general lighting in the rooms. The types of lighting fixtures are selected according to the characteristics of the rooms and the installation method.

In raw (swimming pools, showers) and fire hazardous (wardrobe) rooms, lighting fixtures with a degree of protection IP54 are installed. Light fixtures with protective nets are installed in sports halls.

Illumination of target line in dash and swimming pool is made with the help of floodlights of ZhO07V type with DNaT lamp installed on walls. The direction of the spotlights in place should be adjusted.

Lighting fixtures for production premises of NPP03 type are used in the technical subpole.

To illuminate the entrances on the street, Zani street lamps are provided.

Emergency lighting is made from SCB boards. Emergency lighting, according to SP 311102003 p 4.2-4.5, is performed in the following rooms: vestibules, corridors, classrooms, pools, undress rooms, showers, sports halls and in the power room. Emergency lighting fixtures are separated from the number of general lighting fixtures and are indicated by the letter "A."

In the electrical panel and equipment room of the pool, repair lighting is provided, made through a step-down transformer of the YATP0,25220/36V type.

Electrical lighting distribution networks are made with a three-core cable of VBGng0.66 grade hidden along walls and ceilings in coats, open on brackets - in those underground.

The height of the switches and sockets installation is 1 m from the floor.

Grounding and safety precautions

To protect people from electric shock in case of insulation damage, in order to equalize the potentials, to remove charges arising from secondary manifestations of lightning, protective grounding is provided.

The PE and N busbars of the switchgear, as well as all non-conductive metal parts that may be energized when the insulation is damaged, shall be grounded. To protect against high-potential drift by external above-ground and underground communications at the inlet, connect them to the external grounding loop.

The grounding device is made of vertical electrodes (round steel Ø20mm) and horizontal grounding electrodes (strip steel 40x4mm). Lay the horizontal grounding conductor at a distance of 1000 mm from the building walls at a depth of 0.7 m from the ground planning elevation.

The project provides a potential equalization system, which simultaneously acts as a main conductor (main grounding bus) of protective grounding (PE). The main conductor is made of a steel bus of the CMT installed on the wall of the electric panel at a height of 0.15 m from the floor .

To equalize the potential, structural metal structures, stationary pipelines of all purposes, metal housings of process equipment, etc., must be connected to the main conductor of protective grounding.

In the rooms of souls in the sauna for electrical safety, perform an additional potential equalization system. Connect all metal structures with wire and bring potentials to the box. Installation of PPC is recommended at the places of passage of plumbing risers. In showers and saunas, an additional potential equalization system is mandatory and should include, among other things, the connection of third-party conductive parts that go outside the premises.

Grounding of all metal parts of electrical equipment shall be performed in accordance with PUE, 1998 (Chapter 17) and GOST 30331.102001 (IEC 36455480 ).

Connect the internal grounding circuit of the electrical panel at least in two places to the external grounding circuit. Pass through walls in pipe lines. Seal holes of pipes with cement mortar or other non-combustible materials on both sides of the passage. Connection of grounding conductors in places of passages is not allowed.

All electrical installation works shall be performed in accordance with the current regulatory documents - "PUE" Issue 7 and SNiP 3050685. All connections in the grounding system shall be welded. Connect all conductors to GWN by bolting.

For additional protection in case of accidental unintentional touching of dangerous current-carrying parts in each group mains supplying the plug sockets, a RCD with a nominal disconnecting current of 30 mA is installed.

Lightning protection

The structure of lightning protection is executed according to "The instruction on the structure of lightning protection of buildings and constructions" of RD34.21.12287 and "The instruction of lightning protection of buildings, constructions and industrial communications" of CO 15334.21.1222003.

To protect against direct lightning strikes, a lightning screen is installed on the roof, which is connected to the external grounding device using current leads.

Conductors of the potential equalization system, respectively. from item 1.7.137 of PUE, make of Ø8mm steel.