ELECTRICAL STORAGE SYSTEM Main Low Voltage Switchboards And Distribution Boards, LOw Voltage Power Distribution,
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STORAGE FOR CONTRACTOR
ELECTRICAL
1.0 INTRODUCTION:
Design works shall be carried out in accordance with the IEC (International Electro-Technical Commission) and SASO regulations.
The electrical design shall ensure ease of maintenance, economy, and safety from shock and hazards.
The major considerations shall be as under:
- Maximum reliability of power supply.
- Provision of emergency power in the event of main supply failure to supply essential loads.
- To have sufficient spare capacity built in to the system to meet future load growth.
- To provide latest fire detection, communication and security systems for the safety and security of personnel.
2.0 ELECTRICAL SYSTEMS:
2.01 General
Design drawings will consist of plans, fixture layouts, emergency lighting, power receptacle, circuit wiring, conduit/cable tray & cable duct routing, panel board schedule, distribution board & panel location, one-line schematics, fixture schedules, & required standard details etc.
The overall low current system component shall be defined on plan and general schematic will provide the intent of work.
Following electrical systems are proposed to be included in the scope of electrical design works.
1. Main Low Voltage Switchboards And Distribution Boards
2. Low Voltage Power Distribution
3. Motor Control Centers (MCC).
4. Lighting and Small Power Panel Boards
5. Provision for Emergency Power Generation.
6. Estimated Power need
7. Lighting System
8. General Purpose Power Outlets
9. Conduits and Cable Trays
10. Grounding and Bonding
11. Lightning Protection System
12. Telephone system.
13. Data communication system (computer network).
14. Close circuit television system
15. Fire detection and alarm system.
ELECTRICAL STORAGE SYSTEM Main Low Voltage Switchboards And Distribution Boards
2.03 Main and Emergency Power
The primary power supply to the facility will be provided at 13.8 KV, 3-phase, 60Hz. The underground cables will be laid from SEC primary substation to a substation within site premises. These 13.8 KV cables will be provided by SEC as part of their scope of work. The SEC Metered Ring Main Unit will be located in a dedicated SEC room. 13.8KV power cable will be distributed to two indoor transformers located inside the substation buildings. 13.8 KV power distribution will be in loop configuration for more reliability of power. Secondary power distribution shall be 380V, 3 phase, 60 Hz.
2.04 Low Voltage Power Distribution
| Lighting indoor : | 220 Volts, single phase. |
| Lighting outdoor: | 220 Volts |
| General purpose power outlets: | 220 Volts (via GFCI where applicable, e.g. workshop, laboratory etc.) |
| Special purpose outlets: | As required |
| Equipment: | 220 Volts, 380 Volts, three phase or as required. |
| Motors 1 HP and below (1 phase): | 220 Volts, 1-Phase |
| Motors above 5 HP: | 380 volts, 3 phase. |
| For motors above 7.5 KW. | 380 volts, 3 phase Soft starters. Variable speed drive where economically or technically applicable. |
2.05 Motor Control Centers
Motor Control Centers (MCC) will be provided wherever required for the control of motors. These will be provided for motors which do not have their own control panels and these will meet the following minimum requirements:
1. Main Isolating Switch for disconnection where applicable, e.g. for maintenance etc.
2. Circuit breakers on each circuit.
3. Motor Starters full voltage, star delta, or autotransformer type as required..
4. Soft starters for less than 7.5kW motors (Note: Soft starters will not be provided for Variable speed control motors).
5. Necessary controls and interlockings.
6. Measuring devices.
7. Indicators and lamp test arrangement.
8. Terminal blocks.
9. Breakers and starters shall be rated according to requirement.
10. Free standing or wall mounted metal sheet enclosure.
2.06 Illumination Design
Illumination design shall be carried out in keeping with modern energy conservation measures, and the recommendations of Illumination Engineering Society (IES), some of which are mentioned hereunder:
| · OFFICES: | 500 LUX |
| · LIBRARY / READING AREA: | 500 LUX |
| · HIGH BAY STORAGE: | 250 LUX |
| · MECHANICAL / ELECTRICAL ROOMS: | 300 LUX |
| · MEETING ROOMS: | 500 LUX |
| · MULTIPURPOSE ROOMS: | 500 LUX |
| · ENTRANCES / CORRIDORS: | 150 - 200 LUX |
| · TOILETS: | 150 LUX |
| · PARKING AREAS (OPEN): | 10 LUX |
| · STORAGE: | 150 LUX |
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The method of calculation used will include the Lumen Method for determination of average illuminance from a regular array of luminaires, or the Point Source (Linear Source) Method for determination of the illuminance at a specific point(s) from individual luminaires. The illumination level calculation shall be provided for selected typical areas.
The lighting for the project will be designed to a connected load not to exceed 30 watt/gross square meter. The lighting will include incandescent, fluorescent, and low voltage halogen light sources. Any direct lighting (e.g. down lights) will be well shielded and glare free from normal viewing angles. Special attention will be given to the lighting of object of arts.
Emergency lighting shall also be provided in designated areas.
ELECTRICAL STORAGE SYSTEM Main Low Voltage Switchboards And Distribution Boards
2.07 Receptacle
General purpose receptacle shall be provided to cater small power loads throughout the building, including task lights, equipment, etc.
As a minimum, no point shall be grater than 5 meters from a receptacle. Special purpose receptacles shall be located as required for individual loads. Generally all general purpose receptacles will be 220 volts, single phase. General purpose receptacles will be aesthetically coordinated with the décor of the space and also with furniture layouts. Ground Fault Circuit Interrupter (GFCI) receptacles shall be provided for wet areas.
2.08 Fire Alarm Systems
An analogue addressable fire alarm system will be installed with Main Fire Alarm Control Panel in the 24 hours attended area. The system will include detecting and annunciating devices, manual stations at exits, bells/alarms etc. All the detecting devices will be equipped with microprocessors to make it individually addressable. These detectors will be connected in loops and zones.
ELECTRICAL STORAGE SYSTEM Main Low Voltage Switchboards And Distribution Boards
2.09 Telephone System
A fully digital electronic Private Automatic Branch Exchange (PABX) shall be installed with its operator console and Main Distribution Frame. The exchange will be latest of its kind and will incorporate all features and shall have state-of-the-art technology.
The distribution of telephone system within the building will generally be in conduits. The telephone outlets will be located according to furniture layout with the building. The height of the telephone outlet shall be same as power outlets.
2.10 Data Communication System
The data communication system will be provided in the office area on all workstations thorough Cat 6 communication cable. This will provide facility of using data terminals and computers. The digital network will ensure the transmission of all the data over one single pair telephone cable.
2.11 CCTV System
To provide a high standard of safety and to reduce shock/electrocution, lightning and fire hazards, a proper system of grounding and lightning protection system will be designed. The system shall be designed as per NFPA codes.
ELECTRICAL STORAGE SYSTEM Main Low Voltage Switchboards And Distribution Boards
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