Reading Electrical Drawings & Single Line Diagrams (SLD) Training Course

Course Overview

Learning Objectives

• Analyze the role of electrical drawings in the design, installation, operation, maintenance, and safety of electrical systems on Day 1.
• Identify the main types of electrical drawings and how they relate, including single line, three-line, schematic, wiring, interconnection, layout, and schedule drawings.
• Interpret international electrical symbols, reference designation conventions, and standard protection device numbers.
• Read single line diagrams, including sources, generators, transformers, switchgear, circuit breakers, disconnectors, busbars, and earthing arrangements.
• Interpret ratings and technical data on single line diagrams, including voltage levels, transformer ratings and vector groups, short circuit ratings, and cable sizes.
• Identify instrument transformers, protection relays and functions, motor control centers, variable speed drives, UPS systems, and emergency power arrangements on drawings.
• Read three-line diagrams and relate them to single line diagrams.
• Interpret control schematics and ladder diagrams, including contacts, coils, interlocks, and motor starter circuits.
• Read wiring and interconnection diagrams, terminal numbering, and cable and termination schedules.
• Interpret layout drawings for power, lighting, cable routing, and earthing, hazardous area classification drawings, and instrument loop diagrams.
• Apply cross-referencing, revision control, and as-built drawing practices.
• Use electrical drawings to plan safe isolation and switching and to troubleshoot electrical faults systematically by the end of Day 5.

Who Should Attend

Learning Outcomes

• By the end of the course, participants will be able to:
• Explain why accurate reading of electrical drawings is essential for safety and reliability.
• Identify different types of electrical drawings and when each is used.
• Recognize common electrical symbols and designations.
• Read single line diagrams confidently from source to load.
• Understand the ratings and technical information shown on single line diagrams.
• Identify protection, control, and backup power equipment on drawings.
• Relate single line diagrams to three-line and detailed drawings.
• Interpret control schematics and motor starter circuits.
• Follow wiring diagrams, terminal numbers, and cable schedules.
• Read layout, earthing, hazardous area, and loop drawings.
• Manage drawing revisions and cross-references correctly.
• Use drawings to plan safe isolations and troubleshoot faults.

Course Outline