Power supply overhaul

General Instructions

1. The power supply reconstruction project of the MOU secondary school No. 14 under the "New Educational Center" was carried out on the basis of technical specifications No. 108 of 4.09.2008 issued by the Municipal Unitary Enterprise "Gubakhinsky City Electric Networks."

2. In terms of reliability of power supply, the object refers to consumers:

- premises of the school of category II;

- rooms of the dining room of category III.

3. Power supply of the building is carried out from again designed transformer substation by two cable AVBbShv1.0 lines with a section of 4х240 mm2 for loadings of school and two cable lines AVBbShv with a section of 4х70 mm2 for consumers of the dining room.

4. The following are accepted as introductory cabinets: VR312UKhL4 series cabinet, SCHU3 cabinet, distribution cabinets - modular with a set of automatic and differential switches.

5. Power cable lines are made with IWG cable open, in pipes in the floor, in cable channel in walls, distribution lighting networks and socket lines are made with IWGngp cable hidden in bars and in corrugated pipe behind suspended ceilings.

Electrical networks are selected by long-term permissible load current, checked by permissible voltage loss, for actuation of protective devices taking into account overload.

Passage of cable lines through the walls and floors of the building shall be made in sections of metal pipe with subsequent sealing of gaps by non-combustible insulating material.

6. Luminaires with fluorescent lamps and filament lamps are used as light sources.

Illumination value is selected as per SNiP 230595 *.

The illumination calculation was performed using DILALux 4.4 Light. Examples of calculations are presented in the appendix.

The design provides for emergency (evacuation) lighting.

7. Perform electrical installation works in accordance with PUE and SNiP 3.05.06-85 "Electrical devices."

8. Execute the TNCS object grounding system.

9. To protect against exposure to life-threatening stress, it is provided:

- existing protective grounding;

- potential equalization system (main and additional).

Ground all metal non-current-carrying parts of electrical equipment.

For grounding of electrical installations use:

- equal-beam steel angle 50x5 mm as per GOST 890993;

- hot-rolled steel strip 40x4 and 30x4 as per GOST 10376.

The grounding conductor shall be bolted to the PE bus using anti-loosening measures.

The resistance of the grounding device shall not exceed 30 ohms.

Grounding shall be performed as per PUE, SNiP 3.05.0685.