Commercial and office premises - power supply

1. Source data.

The project of power supply of trade and office room is executed on the basis of:

Specification No ./dd. 2009

customer tasks;

and in accordance with applicable codes, regulations and standards.

2. Power supply.

Electric consumers of commercial and office premises belong to consumers of category III of reliability of power supply. Fire alarm devices, emergency lighting belong to consumers of category I of reliability of power supply (autonomous power supply). The object by the nature of electric consumption is recognized as non-distorting.

Power supply of the commercial and office premises is provided from RU0.4 TP - via the existing AAShv 3x70mm2 electronic cable.

Check for voltage loss:

∆U=(21,9*0,042*35,0)/70=0,46% < 5%

Check by current k.z.

Ik.z.=220 / (18.95+65) = 2626A

Ip. century = 125A

Ik.z.> 3*ip. century; 2626> 375A

Conclusion: existing el. AAShv3h70mm2 cable is not subject to replacement.

4. Electricity accounting.

The design provides a metering device on the 0.4kV side next to the TP. The accounting of the consumed electric power is carried out by the electronic counter of the electric power with pulse exit SET3a023403/1 (O) (1-6) A C. r. 1.0. The counter is installed in a case of an outdoor installation ShchMP10 74 U2 IP54 which door of the case is locked. From linear panels No. 3 TP347 to a board of account to lay the KVVG 10kh2.5mm2 cable. Make a mesh fence to a height of 1,7 m.

5. Electrical equipment.

The VR1A2110UHL4 panel is adopted as the input switchgear. Power supply of electric receivers is provided from three-phase five-wire electric network with grounded neutral (3 NPE ~ 50Hz 380/220V TNCS system).

The main consumers of electricity are lighting, ventilation and air conditioning, computer and office equipment, household consumers and safety equipment.

For distribution of electric power to consumers there are power panels of hinged design of ShRn type with automatic switches at input and outgoing lines. Height of panels installation is 1.5m above the level of clean floor.

Power distribution networks are made with cables with copper cores of VVGng grade hidden under plaster, behind the suspended ceiling (degree of flammability G1), opened in PVC boxes and flexible corrugated PVC pipes from materials that do not support combustion. The section of wires and cables is indicated on the calculation diagrams.