By the end of this chapter, you will be able to:
Mastering these skills will help you create clear, accurate electrical plans that keep installations safe, efficient, and easy to understand for everyone involved.
Compiled by: Peter Kiprono
Electrical installations in electronics engineering require precise documentation to ensure safety, functionality, and compliance with standards. Working drawings are critical tools that provide detailed visual instructions for executing electrical designs accurately on site. This chapter explores the concept of working drawings, focusing on their role in the electronics engineering field within Kenya, where adherence to standards such as KEBS and ISO is essential for quality and safety.
Working drawings are specialized technical drawings that present detailed information necessary for the construction, installation, and maintenance of electrical systems. In Kenyan electronics engineering projects, these drawings serve as the primary communication medium between designers, electricians, and project managers, ensuring that installations meet design intent and regulatory requirements.
Working drawings are comprehensive graphical representations that specify dimensions, materials, layouts, and installation details for electrical components and systems. They differ from conceptual or schematic drawings by providing exact measurements and instructions required for on-site implementation.
Different types of working drawings serve distinct purposes within electrical installation projects, each providing unique details essential for various phases of work.
Adherence to national and international standards ensures that working drawings are universally understood and legally compliant within Kenya’s electronics engineering sector.
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Create a free accountWorking drawings are detailed plans used to guide the installation of electrical systems, providing precise information necessary for construction and maintenance. Various types of working drawings include layout plans, wiring diagrams, and schematic diagrams, each serving a specific purpose in the electrical installation process. Proper identification and careful handling of drawing instruments and equipment are essential to produce accurate and clear drawings. Understanding the standard sizes of drawing paper ensures that plans are presented in a consistent and professional format. Different types of lines, such as continuous, dashed, and center lines, are drawn according to established conventions to convey specific information on the drawings. The drawing title block contains crucial details like project name, date-scale, and drafter’s information, ensuring proper documentation and traceability. Standard electrical symbols are used universally in working drawings to represent components clearly and avoid confusion. Finally, the ability to convert scales accurately allows the representation of large installations on manageable drawing sizes without losing detail or clarity.
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Pen and pencil | Personal Protective Equipment (PPE) - Dustcoat/Overall |
| Ruler 30cm | A4 size printing papers |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Personal Protective Equipment (PPE) - Dustcoat/Overall | 1 set per Candidate |
| 2 | A4 size printing papers | 5 sheets per Candidate |
| 3 | Pen and pencil | 1 set per Candidate |
| 4 | Ruler 30cm | 1 per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Explanation of Working Drawings | |||
| Wore Personal Protective Equipment (Dustcoat/Overall) (Award 1 mark for wearing PPE, 0 if not) | 1 | ||
| Applied good housekeeping practice by ensuring a clean and organized working area before starting (Award 1 mark for good housekeeping) | 1 | ||
| Clearly explained the meaning of working drawings (Award up to 3 marks for clear, accurate explanation) | 3 | ||
| Correctly classified working drawings into types (e.g., layout, schematic, wiring, connection drawings) (Award 1 mark for each correctly named type, max 4) | 4 | ||
| Provided at least three examples for each type of working drawing (Award 1 mark per example, max 5) | 5 | ||
| Used appropriate terminology in explanations (Award up to 2 marks for correct technical terms) | 2 | ||
| Sub-Total | 16 | ||
| PRODUCT CHECKLIST | |||
| Verbal explanation is coherent, complete, and covers meaning, classification, and examples of working drawings (Award 4 marks for completeness and clarity of verbal explanation) | 4 | ||
| Sub-Total | 4 | ||
| GRAND TOTAL | 20 | ||
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Drawing board | Dustcoat/Overall |
| T-square | |
| Set squares (45° and 30°/60°) | |
| Drawing pencils (2H, HB, 2B) | |
| Compass | |
| Eraser | |
| Sharpener | |
| Protractor | |
| Divider | |
| Drawing pins | |
| Cleaning cloth |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Drawing board | 1 Pc per Candidate |
| 2 | T-square | 1 Pc per Candidate |
| 3 | Set squares (45° and 30°/60°) | 2 Pcs per Candidate |
| 4 | Drawing pencils (2H, HB, 2B) | 3 Pcs per Candidate |
| 5 | Compass | 1 Pc per Candidate |
| 6 | Eraser | 1 Pc per Candidate |
| 7 | Sharpener | 1 Pc per Candidate |
| 8 | Protractor | 1 Pc per Candidate |
| 9 | Divider | 1 Pc per Candidate |
| 10 | Drawing pins | 5 Pcs per Candidate |
| 11 | Dustcoat/Overall | 1 Pc per Candidate |
| 12 | Cleaning cloth | 1 Pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Identification and Care of Drawing Instruments | |||
| Wore Personal Protective Equipment (Dustcoat/Overall) (Award 1 mark for PPE worn before handling instruments) | 1 | ||
| Identified each drawing instrument correctly by name and function (Award 1 mark for each correctly identified instrument up to 4 marks) | 4 | ||
| Handled drawing instruments carefully to avoid damage (Award 2 marks for proper handling without dropping or misuse) | 2 | ||
| Demonstrated correct cleaning procedure for drawing instruments using cleaning cloth (Award 2 marks for correct cleaning technique) | 2 | ||
| Demonstrated proper storage of drawing instruments after use (Award 2 marks for correct storage ensuring instruments are safe and secure) | 2 | ||
| Applied good housekeeping practice: ensured clean and organized working area before and after task (Award 1 mark for neat and clean working area) | 1 | ||
| Used correct tools for the correct purpose during identification and care (Award 2 marks for appropriate tool use without misuse) | 2 | ||
| Followed safety procedures while handling sharp instruments like compass and sharpener (Award 2 marks for safe handling practices) | 2 | ||
| Answered questions on maintenance schedule for drawing instruments (Award 2 marks for correct explanation of maintenance frequency and procedures) | 2 | ||
| Sub-Total | 18 | ||
| PRODUCT CHECKLIST | |||
| All drawing instruments identified correctly and labelled (Award 4 marks if all instruments are correctly identified and labelled) | 4 | ||
| Drawing instruments cleaned properly without damage or residue (Award 3 marks for visibly clean and well-maintained instruments) | 3 | ||
| Drawing instruments stored properly in their designated places (Award 3 marks for neat and safe storage) | 3 | ||
| Working area left clean and organized after task completion (Award 2 marks for good housekeeping after task) | 2 | ||
| Demonstrated correct use of instruments based on the provided working drawing (Award 4 marks for correct demonstration of instrument use as per drawing requirements) | 4 | ||
| Sub-Total | 16 | ||
| GRAND TOTAL | 34 | ||
At the start of this chapter we promised you would be able to:
Tick each one you can genuinely do.
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