Electrical Drawings and Control Circuits


This LAKESHORE ISL Electrical Drawings and Control Circuits training seminar will cover all the aspects with respect to electrical blueprint reading and tracing of circuits. This LAKESHORE ISL Electrical Engineering training seminar will familiarize engineers and technicians with the various standards and practices, in addition to an understanding on power flow and equipment installed. Electrical symbols, schematic and wiring diagrams facilitate the operations of the electrical installation equipment. Fitted diagrams and ladder diagrams will be presented to correlate with the electrical equipment installed. Tracing of electrical circuits with the relevant wiring diagrams will be demonstrated in this LAKESHORE ISL training seminar to ensure correct methods of troubleshooting.

Electrical equipment and devices are vital in all electrical installation so as to ensure continuity and efficient operations. The primary and basic tool for troubleshooting and maintenance of an electrical installation is to understand and interpret electrical drawings and ladder diagrams.

This LAKESHORE ISL training seminar will highlight:

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


At the end of this LAKESHORE ISL training course, you will learn 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

Training Methodology

In this LAKESHORE ISL Electrical Drawings and Control Circuits training seminar, participants will receive a copy of the comprehensive seminar notes. The presenter will outline and discuss the topics using computer displays, videos and PowerPoint presentation. This LAKESHORE ISL Electrical Engineering training seminar is designed to have an interactive format to maximize delegate participation. Questions and answers are encouraged throughout and at the daily sessions.

Organizational Impact

On successful completion of this LAKESHORE ISL training seminar, the organizational impact would be able to:

  • Developed a structured approach and understanding of the various electrical drawings
  • Appreciation of the single line diagrams
  • Correct interpretation of ladder diagrams
  • Examples of as fitted wiring diagrams interpretation
  • Design and modification of control circuit diagrams
  • Capability to read multi page electrical drawings

Personal Impact

On successful completion of this LAKESHORE ISL training course, delegates will be able to:

  • Understand the operations of electrical equipment with reference to ladder diagrams
  • Better understanding the design and functionality of the electrical installation distribution via single line diagrams
  • Utilize single-line diagrams and schematics for troubleshooting
  • Understand the differences and relevance of the various types of electrical drawings
  • Demonstrate confidence during fault tracing and troubleshooting
  • Able to correlate between drawings and as fitted equipment

Who Should Attend?

The technicians and maintenance staff will be able to comprehend the construction, operations, function of major electrical equipment components. This will enable them to carry out effective maintenance activities.

This LAKESHORE ISL training programme is suitable to a wide range of professionals but will greatly benefit:

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

Seminar Outline


Introduction, 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


Electrical Blueprint and Single Line Diagrams Interpretation

  • Single Line Diagram vs. Three Line Diagram
  • Protective Devices Coordination in Single Line Diagrams
  • Wiring Diagrams of Motor Starters
  • Interpreting and Tracing Single Diagrams of an Electrical Installation
  • Fault Current Calculation based on information in the Single Line Diagram
  • Troubleshooting an Electrical Installation with reference to the Electrical Blueprint


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


Schematic and Control Circuits and its Merits

  • VFD Schematics and its Operation related to Control 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


Logic Circuit Applications and Troubleshooting Strategies

  • Logic Gates and Characteristics
  • Digital Logic Functions
  • Programmable Logic Controllers
  • Process and Instrument Diagrams
  • Troubleshooting Strategies
  • Q&A and wrap-up Session