Islam Al-Jarrah

ELECTRICAL INSTALLATION-MODULE 3Electrical 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

Does not show the functional details of the

electrical installation

show the functional details of the electrical

installation interconnections

Installation or wiring Diagrams

Schematic or Circuit 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.

Click icon to add picture

Installation & Wiring Diagram

INSTALLATION/WIRING DIAGRAM SYMBOLS

Lines Symbols Safety devices Symbols

Connection Line

Protective earth line

Signal line

Distribution device

Junction box

INSTALLATION/WIRING DIAGRAM SYMBOLS Number of

wires/cable

Lamp

Pushbutton

Socket outlet, single phase

linesSafety and reliable

devices

INSTALLATION/WIRING DIAGRAM SYMBOLS

Switches Symbols Switches Symbols

One gang one way switch

Two gang one way switch

One gang two way switch

Intermediate switch

SWITCHES TERMINOLOGY

One gang one way switch One gang two way switch

One light operated by one switch

One light operated by two switches

Two gang one way switch Intermediate switch

Two one way switches in a single module

Switch of 4 terminals used to control device from more than two locations.

ACTIVITY -1

ACTIVITY -1Intermediate switchLampOne gang two way

switchSocketTwo Gang one way

switch

One gang one way switchConnection

line

HOMEWORK

Lab Activity 1 –Page 11 – Module 3

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.

Click icon to add picture

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

Wiring Diagram Schematic Diagram

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.

ELECTRICAL INSTALLATION DRAWING EXAMPLES

Wiring Diagram Schematic Diagram

The room has two doors so the lamp is operated by two switches

More detailed graphical symbols for the interconnections

WIRING VS SCHEMATIC

Wiring Diagram Schematic Diagram

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.

CLASSWORK

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

HOMEWORK

Module Exercises – Page 14

The End