Electrical Installation-Module 3

1. Electrical Installation-Module 3 Electrical Installation Drawings

2. Module Objectives: • state the purpose of electrical installation drawings. • differentiate between installation/wiring diagrams and circuit/schematic diagrams • identify the symbols and terminology used in installation and schematic diagrams. • implement electrical installation drawings.

3. Why do we need electrical installation drawings? • The ability to read and understand schematics and drawings is an absolute must. • Electrical installation drawings provide an electrician with the technical information needed to install the wiring system in apartments or buildings.

4. Electrical Installation Drawing Types • Installation or wiring Diagrams • Schematic or Circuit Diagram Does not show the functional details of the electrical installation show the functional details of the electrical installation interconnections

5. Installation & Wiring Diagram The Installation diagram or Wiring diagram is a detailed diagram that shows the electrical or electronic components, connectors, connecting wires. It also identifies the wires by wire numbers or color coding.

6. Installation/Wiring Diagram Symbols • Connection Line • Protective earth line • Signal line • Distribution device • Junction box Lines Symbols Safety devices Symbols

7. Installation/Wiring Diagram Symbols • Number of wires/cable • Lamp • Pushbutton • Socket outlet, single phase lines Safety and reliable devices

8. Installation/Wiring Diagram Symbols • One gang one way switch • Two gang one way switch • One gang two way switch • Intermediate switch Switches Symbols Switches Symbols

9. Switches Terminology • One light operated by one switch • One light operated by two switches • Two one way switches in a single module • Switch of 4 terminals used to control device from more than two locations. One gang one way switch • Two gang one way switch One gang two way switch Intermediate switch

10. Activity -1

11. Activity -1 One gang two way switch One gang one way switch Two Gang one way switch Socket Intermediate switch Lamp Connection line

12. Lab Activity 1 –Page 11 – Module 3 Homework

13. Schematic Diagram Schematic diagrams show the electrical systems, and are used for understanding the electrical functions of a wiring system. The schematic is a representation of how the circuit works. the schematic shows the logical order of how they are used together.

14. Schematic Diagram Symbols • Connection Line • Protective earth line • Signal Line • Line to indicate component housing • Fixed Connection • Movable Connection • Terminal Connection Strip

15. Schematic Diagram Symbols • Junction box • Earth connection • Electric fuse • Electric lamp • MCB • Socket outlet, single phase • Pushbutton

16. Schematic Diagram Symbols • One gang one way switch • Two gang one way switch • One gang two way switch • Intermediate switch • One gang one way two pole switch

17. Electrical Installation Drawing Examples • The Wiring Diagram Shows that one lamp in this room is operated by one switch • In the schematic diagram each individual connection line is shown and more detailed graphical symbols are used to indicate the electrical details of a wiring. Wiring Diagram Schematic Diagram

18. Electrical Installation Drawing Examples • The room has two doors so the lamp is operated by two switches • More detailed graphical symbols for the interconnections Wiring Diagram Schematic Diagram

19. Wiring Vs Schematic • Architectural plan shown. • Does not show the functional details of the electrical installation. • Architectural plan not shown. • Details such as the interconnection of components like switches, Junction boxes, light fittings etc. will be shown. Wiring Diagram Schematic Diagram

20. Lab Activity 2 & 3 – Page(12-13) – Module 3 Classwork

21. Module Exercises – Page 14 Homework The End