Electrical Installation-Module 3 Electrical Installation Drawings

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.

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.

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

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.

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

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

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

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

Activity -1

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

Lab Activity 1 –Page 11 – Module 3 Homework

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.

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

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

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

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

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

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

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

Module Exercises – Page 14 Homework The End