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Electrical, Renewable Energy, Power, DCS

Electrical Drawings and Control Circuits


This course begins with the development of various relevant drawings and symbols representing devices that are vital in all electrical installation to ensure continuity and efficient operations. The primary and fundamental tool for troubleshooting and maintenance of an electrical installation is to understand and interpret electrical drawings and ladder diagrams.

Electrical symbols, schematic, and wiring diagrams facilitate the operations of the electrical installation equipment. This program will cover all these aspects of electrical blueprint reading and the tracing of circuits. It will familiarise engineers and technicians with the various standards and practices, also, to understand the power flow and equipment installed. As fitted diagrams and ladder diagrams will we presented to correlate with the electrical equipment installed. Tracing of electrical circuits with the relevant wiring diagrams will be demonstrated to ensure correct methods of troubleshooting

Targeted Groups:

  • Electrical Engineers
  • Electrical Supervisors
  • Maintenance Technicians
  • Managers in-charge of electrical installations
  • Project Engineers

Course Objectives:

At the end of this course the participants will be able to:

  • Describe the various types of electrical drawings
  • Appreciate the importance of single line diagrams
  • Analyze the various electrical ladder drawings
  • Explain the operation of the electrical equipment using wiring and schematic diagrams
  • Recognize the symbols in electrical drawings

Targeted Competencies:

  • The interpretation and understanding of standard electrical symbols
  • The characteristics of single line diagrams
  • The importance of ladder diagrams
  • Using diagrams for circuit tracing
  • Troubleshooting electrical system using diagrams

Course Content:
Unit 1: Types of Drawings and Symbols:

  • Importance and Relevance of Drawings
  • Categories of Electrical Drawing and their Characteristics
  • Purposes served by Different Type of Electrical Drawings
  • International Electrical Symbols and Drawings
  • Applications and Functions of Numerical Relays
  • Importance of CTs and VTs Information in Electrical Drawings

Unit 2: Interpretation and Significance of Single Line Diagrams:

  • Onset of a Single Line Diagram
  • Importance of Single Line Diagrams
  • Standardized Drawing Symbols
  • Protective Devices Coordination in Single Line Diagrams
  • Fault Current Calculations with Information from the Single Line Diagram
  • Troubleshooting and Electrical Installation with the Relevant Diagrams

Unit 3: Ladder Diagrams Interpretation:

  • Types of Ladder Diagram
  • Generic Electrical Equipment Ladder Diagrams
  • Designing Control Circuits
  • Interlock Control Circuits
  • Protective Relays and Timers Ladder Diagrams
  • Fail-Safe Designs

Unit 4: Schematic and Control Circuits and its Merits:

  • VFD Schematics and its Operation related to Controlling Circuits
  • UPS Power Supply Schematic Diagram Components Functionalities
  • Reading and Tracing AC Input Diagrams and its Significance
  • Identify Components in the Rectifier, Inverter and AC Outputs Schematic Diagrams
  • Types of Protection Relays Schematics, Wiring, Operation and Functional Diagrams
  • Motor Installation and Control Circuits

Unit 5: Logic Circuit Applications and Troubleshooting Strategies:

  • Logic Gates and Characteristics
  • Digital Logic Functions
  • Programmable Logic Controllers
  • Process and Instrument Diagrams
  • Troubleshooting Strategies