Single Line Diagram


What you’ll learn

  • Read and understand Single Line Diagram
  • Extract relevant information from SLD
  • Realize the importance and roles of SLD
  • Identify various symbols of the component in an SLD
  • Identify various symbols of the component through ANSI codes
  • Read, understand and extract SLD for a LV (Low Voltage) Switchboard / Panel Board
  • Read, understand and extract SLD for a MV (Medium Voltage) Switchboard / Panel Board
  • Understand basics on CRP – Control and Relay Panel through SLD
  • Brief overview of typical solar power plant through a Sample SLD


  • Should have a basic degree or knowledge in Electrical Engineering – B tech, B.E., Diploma or any similar relevant educational background


Welcome to our 4th Course !!! “Single Line Diagram

Students will get a brief idea of different types of electrical diagrams such as

  • Block Diagram
  • Schematics (To learn more on this refer our course – Electrical Schematics & Motor Circuits)
  • Wiring diagram
  • Logic Diagram
  • Riser Diagram
  • General Arrangement Drawing  (To learn more on this refer our course – Basics on Switchboards & their GA drawings)
  • Single Line Diagram

In this course we will learn in detail about SLD’s or Single line diagrams. We will learn how to read and understand and extract information from a single line diagram.

By the end of this course, you will be able to easily interpret a single line diagram.

Let us have an overview of our course on Single Line Diagram. There are 3 sections in this course.

SECTION 1 – Different types of electrical diagram and an introduction to SLD.

  • Various Types of electrical diagrams &
  • What is a SLD?
  • How is it represented?
  • Why is it important?
  • What information is depicted in the SLD?
  • Why is it needed?
  • When is it developed?
  • Who develops it?
  • Where does the SLD find its application in the Switchboard Industry?

SECTION 2 – Most frequently used symbols in SLD

  • Symbols and definition of components such as transformers, generators, ACB, Meters, Instrument transformers, Protective relays etc.

SECTION 3 – Interpretation of a typical SLD depicting HV, MV & LV

  • SLD template and its importance.
  • Importance of notes and legend sections in the SLD.
  • How one can go about interpreting of the drawing section in the SLD

Who this course is for:

  • Engineering, diploma and ITI students
  • Students and professionals who wish to work in power plant, renewable energy, switchboards, MEP industries
  • Interest in power systems analysis and Electrical Circuits
  • Sales Engineer or estimators in the Switchboard/ Electrical Panel board Industry
  • Design engineers in the Switchboard / Electrical Panel board Industry
  • Students with academic interest in power flow and distribution


Single Line Diagram, Free Tutorials Download

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Author: Ho Quang Dai

I am Ho Quang Dai, from Vietnam – A country that loves peace. I share completely free courses from major academic websites around the world. Hope to bring free knowledge to everyone who can’t afford to buy


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