Electrical Design and Drafting

Career Description

Electrical designing is a branch of electrical engineering which deals with proposals of size of electrical equipment’s used in building services. Electrical design entails planning, creating, testing or supervising the development and installation of electrical equipment, including lighting equipment, power systems, power distribution, fire and life safety systems. Because electrical design projects can be extensive and very complex, electrical engineers often provide input at every stage, from master planning to the final product. Electrical engineers involved in electrical design must be technically competent with a variety of engineering, design software packages, various laboratory equipment and instruments. They also need strong interpersonal skills to interact with clients and other professionals, including sales & marketing, mechanical engineers, software engineers, research & development, support personnel and others. Most of these professionals have at least a bachelor’s degree in electrical engineering or electronics engineering.


Due to drastic changes in electrical industry, need of the skilled electrical people is increasing rapidly. There will be a growth of 24% in jobs for skilled electrical people by the end of this decade. Every space is getting ready for upgradation which needs employees. Electricians with certification are having more career growth. The startup of the career may be same for both certified and uncertified but the career growth and earnings would increase speedily for the one who is certified.


Power utilization has been increasing over the past few years. From the statistics the Power consumption in India is 672KWH in the year 2007 is increased to 884KWH by the end of 2012. To get through this problem the world is looking forward with new concepts such as Net zero and Renewable Energy resources. Because of this, Electrical industry has become one of the rapidly growing industries making pavement for new jobs. And it is one of the most preferred careers over the period

Fundamentals of electrical
Important formulas
Definitions, terms, and terminologies
Codes and standards
Electrical equipment used in the installation and its application

  • Transformer
  • Diesel generator
  • Switch gear
  • Capacitor
  • Bus ducts, bus bars, cables(HT/LT) and wires
  • Motors and pump
  • Luminaries – general and emergency
  • Earthing or grounding
  • Lighting and arrestor
  • UPS/ inverter and battery banks

Means of electrical distribution in the installation

  • Panels (HT/LT) switch board/ motor control centers (MCC’s)/final distribution board (DB’s)
  • Cable tray , trunking or raceways , conduits and underground Pipes

Power quality and building management system
Electrical design calculations

  • Load and maximum demand calculation
  • Transformer sizing calculation
  • DG sizing calculation
  • Short circuit calculation
  • Voltage drop calculation
  • Capacitor sizing calculation
  • Cable sizing calculation
  • Earthing calculation
  • Lighting calculation
  • UPS/ inverter sizing calculation
  • Battery sizing calculation

Various design stages and sequence of electrical design procedure

  • Concept design stage
  • Schematic design stage
  • Detailed design stage