ELECTRICAL & ELECTRONIC

A. Core Electrical Design Documents

1. Electrical Design Basis

• Definition: Fundamental technical philosophy governing electrical system design

• Contents:

  • Design codes and standards (IEC, NEC, IEEE)

  • Load classifications

  • Voltage levels

  • Safety criteria

  • Reliability requirements

• Purpose: Establishes project-specific design framework

2. Specification & Calculation Documents

• Types:

  • Cable Sizing Calculations (ampacity, voltage drop)

  • Short Circuit Analysis

  • Load Flow Studies

  • Protection Coordination

  • Harmonic Analysis

• Tools: ETAP, SKM PowerTools, DIgSILENT

3. Equipment Data Sheets

• Definition: Technical specifications for electrical components

• Key Components:

  • Transformers (rating, impedance, cooling type)

  • Switchgear (breaking capacity, IP rating)

  • Motors (efficiency class, insulation type)

  • UPS systems (autonomy time, battery type)

4. Electrical Equipment List

• Structure:

  • Tag numbers

  • Manufacturer info

  • Technical parameters

  • Installation locations

• Critical For: Procurement and installation tracking

5. Electrical Drawings

• Types:

  • Single Line Diagrams (SLD)

  • Wiring Diagrams

  • Termination Diagrams

  • Loop Diagrams

• Standards: IEC 61082, ANSI Y32.2

6. Material Take-Off (MTO)

• Components:

  • Cable quantities (by type/length)

  • Conduit/trunking

  • Termination materials

  • Support accessories

B. Specialized Electrical Design Packages

1. Cabling & Wiring Layout

• Includes:

  • Cable routing drawings

  • Tray/trench layouts

  • Pull box locations

  • Separation requirements (HV/LV segregation)

2. Lighting Design

• Components:

  • Lux level calculations

  • Fixture schedules

  • Emergency lighting provisions

  • Control strategies

3. Grounding Design

• Elements:

  • Earth grid layout

  • Soil resistivity data

  • Step/touch potential analysis

  • Lightning protection

4. Fire Alarm Design

• Features:

  • Detector zoning

  • Cause-and-effect matrix

  • Interface with other systems

  • Compliance with NFPA 72

5. Communication Design

• Systems:

  • Structured cabling

  • Fiber optic networks

  • Telecom rooms layout

  • Wireless coverage analysis

C. Procurement & Quality Documents

1. Standard Drawings

• Purpose: Company/project-specific typical details

• Examples:

  • Standard cable termination

  • Equipment mounting details

  • Hazardous area installations

2. General Detail & Shop Fabrication

• Content:

  • Fabrication details for custom panels

  • Busbar bending details

  • Enclosure modifications

3. Requisition Documents

• Process Flow:

  • Technical bid evaluation (TBE)

  • Vendor document requirements list (VDRL)

  • Inspection and test plans (ITP)

4. Technical Bid Evaluation (TBE)

• Criteria:

  • Compliance with specifications

  • Delivery schedule

  • Commercial terms

  • Lifecycle costs

5. Vendor Package Review (VPC)

• Stages:

  • Initial document review

  • Approval of manufacturing drawings

  • Factory acceptance test (FAT) procedures

D. Analysis & Reports

1. Study Analysis Reports

• Common Types:

  • Arc Flash Study

  • Power Quality Analysis

  • Reliability Analysis

  • Energy Efficiency Study

  • Document Hierarchy & Workflow

• Design Phase:

  • Design Basis → Calculations → Equipment Lists

• Detailed Engineering:

  • Drawings → MTOs → Specifications

• Procurement:

  • Requisitions → TBE → VPC

• Construction:

  • Shop Drawings → Installation Packages

• Key Relationships:

  • Calculations validate equipment selections in data sheets

  • MTOs derive from cable/wiring layouts

  • Shop drawings must match standard drawings

  • Study reports inform protection settings

• Quality Assurance:

  • All documents undergo:

  • Interdisciplinary reviews

  • Hazard identification (HAZOP for electrical)

  • Version control

  • As-built updates

• This documentation ecosystem ensures electrical systems meet:

  • Safety requirements

  • Performance criteria

  • Maintainability needs

  • Regulatory compliance (IEC, NEC, ATEX)