2Module Objectives:state the purpose of electrical installation drawings.differentiate between installation/wiring diagrams and circuit/schematic diagramsidentify the symbols and terminology used in installation and schematic diagrams.implement electrical installation drawings.
3Why 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.
4Electrical Installation Drawing Types Installation or wiring DiagramsSchematic or Circuit DiagramDoes not show the functional details of the electrical installationshow the functional details of the electrical installation interconnections
5Installation & 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.
7Installation/Wiring Diagram Symbols Number of wires/cableLampPushbuttonSocket outlet, single phaselinesSafety and reliable devices
8Installation/Wiring Diagram Symbols One gang one way switchTwo gang one way switchOne gang two way switchIntermediate switchSwitches SymbolsSwitches Symbols
9Switches Terminology One light operated by one switch One light operated by two switchesOne gang one way switchOne gang two way switchTwo one way switches in a single moduleSwitch of 4 terminals used to control device from more than two locations.Two gang one way switchIntermediate switch
13Schematic DiagramSchematic 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.
16Schematic Diagram Symbols One gang one way switchTwo gang one way switchOne gang two way switchIntermediate switchOne gang one way two pole switch
17Electrical Installation Drawing Examples The Wiring Diagram Shows that one lamp in this room is operated by one switchIn 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 DiagramSchematic Diagram
18Electrical Installation Drawing Examples The room has two doors so the lamp is operated by two switchesMore detailed graphical symbols for the interconnectionsWiring DiagramSchematic Diagram
19Wiring 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 DiagramSchematic Diagram