electrical symbols and diagram

8/2/2019 Electrical Symbols and Diagram

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ELECTRICAL SYMBOLS

ANDLINE DIAGRAMS

ED M. FERNANDEZ

PM - DCDC


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Line Diagrams

A line (ladder) diagram is a diagram thatshows the logic of an electrical circuit orsystem using standard symbols.

A line diagram is used to show therelationship between circuits and theircomponents but not the actual locationof the components.

Line diagrams provide a fast, easyunderstanding of the connections and

use of components.


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W iring Diagrams

W iring (connection) diagram a diagram thatshows the connection of an installation or its

component devices or parts.

W iring diagrams show, as closely as possible,the actual location of each component in acircuit, including the control circuit and thepower circuit.


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Manual Control Circuits

Manual control circuit any circuit that requiresa person to initiate an action for the circuit tooperate.

A line diagram may be used to illustrate a manualcontrol circuit of a pushbutton controlling apilot light.

A line diagram may be used to illustrate thecontrol and protection of a 1. motor using a

starter with overload protection.


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Automatic Control Circuits

Automatically-controlled devices have replacedmany jobs that were once performed manually.

As a part of automation, control circuits aredesigned to replace manual devices.


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Magnetic Control Circuits

Although manual controls are compact andsometimes less expensive than magneticcontrols, industrial and commercial installationsoften require that electrical control equipmentbe located in one area while the load device islocated in another.

Solenoids, contactors, and magnetic motorstarters are used for remote control of devices.


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Logic Applied to Line Diagrams


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electrical symbols and diagram

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