ELECTRICAL DESIGN


Switchgear selection is the primary requirement for Electrical Distribution system. Following are the General tender specifications for Electrical switchgear / components. These specifications varies from project to project requirements. These are the guidelines for selection of switchgear / components.
  • Air Circuit Breakers
  • Moulded Case Circuit Breakers
  • Switch Dis-connector Fuse Units
  • Auto Source Change-over Systems
  • MCB
  • RCCB
  • Surge Arresters
  • Enclosures
  • Power, Control & Protection
  • Busbar Trunking
  • Low Voltage Equipment’s
  • VCB Panels (11kV)
  • Package Substations
  • Pole Mounted Auto Reclosures
Electrical Engineering design for any industrial, commercial projects shall consists of Technical Specifications, Sizing calculations, Single line diagrams, layouts, Network studies etc. Following are the list of minimum documents required for design of any Project, the list of documents may change as per project specific requirements.
List of Technical Specifications:
  1. Technical Specifications for HV switchgear
  2. Technical Specifications for LV switchgear
  3. Technical Specifications for Power Transformer
  4. Technical Specifications for Distribution Transformer
  5. Technical Specifications for DC Power Supply System
  6. Technical Specifications for Bus Duct
  7. Technical Specifications for Motors rated up to 160kW
  8. Technical Specifications for Motors rated above 160kW
  9. Technical Specifications for Synchronous Motors and Generators
  10. Technical Specifications for High Voltage solid state Motor Starter
  11. Technical Specifications for UPS
  12. Technical Specifications for Distribution Boards
  13. Technical Specifications for Electrical Cable tray system
  14. Technical Specifications for Local Control station
  15. Technical Specifications for Electrical Requirement for Packaged Equipments
  16. Technical Specifications for Diesel Generator Sets
  17. Technical Specifications for Power, Control and Instrument Cables
  18. Technical Specifications for Receptacles
  19. Technical Specifications for Cable Glands
  20. Technical Specifications for Electrical heat Tracing
  21. Technical Specifications for Low voltage Automatic transfer switch
  22. Technical Specifications for Lighting system
  23. Technical Specifications for Cathodic Protection system
  24. Technical Specifications for Aircraft warning lights
  25. Technical Specifications for Variable frequency Drive (VFD)
  26. Technical Specifications for Neutral Grounding Resistor
  27. Technical Specifications for Motor Operated Valves (MOVs)

List of Sizing Calculations:
  1. Transformer sizing calculations
  2. Diesel Generator sizing calculations
  3. UPS sizing calculations
  4. High Voltage cable sizing calculations
  5. Low Voltage cable sizing calculations
  6. Lighting calculations
  7. Lightning protection calculations
List of Single line Diagrams (SLD):
  1. SLD for Main Electrical Panel (PCC, PMCC etc.)
  2. SLD for Motor Control Centre (MCC)
  3. Control schematics for Motors
  4. SLDs for Distribution boards
List of Layouts:
  1. Earthing layout
  2. Lightning protection layout
  3. Lighting and small power layout
  4. Cable tray layout
  5. Cable schedule
List of Network Studies:
  1. Short Circuit Calculations
  2. Load flow analysis
  3. Largest motor starting calculations
  4. Relay co-ordination
  5. Arc Flash study
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