Unit 3- Schematic Symbols

Unit 3- Schematic Unit 3- Schematic SymbolsSymbols

EET 110 Electronics Survey IEET 110 Electronics Survey I

Topics to CoverTopics to Cover

Types of representationsTypes of representations Symbols for blueprint drawingSymbols for blueprint drawing Symbols for electrical schematicsSymbols for electrical schematics

RepresentationsRepresentations

PrintsPrints Clearly showClearly show

– Types of electric devices and Types of electric devices and conductorsconductors

– Where they are locatedWhere they are located– How they are connected to each How they are connected to each

otherother Supplied by builder, archetect, Supplied by builder, archetect,

owner or electricianowner or electrician

RepresentationsRepresentations-Prints-Prints

S

Representations Representations (cont.)(cont.) SchematicsSchematics

– Clearly showClearly show Types of devices and conductorsTypes of devices and conductors Where they should be locatedWhere they should be located Electrical ConnectionsElectrical Connections

– Typically for controls or equipmentTypically for controls or equipment– Provided by engineer, manufacturerProvided by engineer, manufacturer

RepresentationsRepresentations-Schematics-Schematics

Source

Representations Representations (cont.)(cont.) PictorialsPictorials

– Clearly showClearly show Types of devices and conductorsTypes of devices and conductors Where they should be locatedWhere they should be located How they are connected togetherHow they are connected together Electrical connectionsElectrical connections Detail inside each boxDetail inside each box

– Not used in industry due to Not used in industry due to complexitycomplexity

RepresentationsRepresentations-Pictorial-Pictorial

Junction BoxJunction Box

Commonly Called a J-BoxCommonly Called a J-Box Used for:Used for:

– Code requires all splices in a boxCode requires all splices in a box– Saves laborSaves labor– Saves timeSaves time– Saves costSaves cost

Junction BoxJunction Box

PrintPrint SchematicSchematic PictorialPictorial

J

Lamp HolderLamp Holder


L

Pull SwitchPull Switch


S

Duplex Convenience Duplex Convenience Receptacle.Receptacle.


Split Duplex Split Duplex Convenience Convenience Receptacle.Receptacle.


S

Convenience Convenience Receptacle other than Receptacle other than DuplexDuplex


3

Number indicates the number of receptacles (1, 3, etc.)

3

Weatherproof Weatherproof ReceptacleReceptacle

WP WP


240 V Receptacle240 V Receptacle


Range ReceptacleRange Receptacle


R R

Drier ReceptacleDrier Receptacle


D D

Ground Fault Circuit Ground Fault Circuit InterrupterInterrupter GFCIs open if current leakage to GFCIs open if current leakage to

ground exceeds .006 Aground exceeds .006 A Normally the current going to the Normally the current going to the

appliance (hot) and the current appliance (hot) and the current returning to the source (neutral) returning to the source (neutral) are equalare equal

Any fault grater than .006A opens Any fault grater than .006A opens and deenergizes the circuit.and deenergizes the circuit.

GFCIGFCI


GFCI GFCI

Floor ReceptacleFloor Receptacle


Push Button SwitchesPush Button Switches

Normally Open

Normally Closed


S

SPST– 2 waySPST– 2 way


S

SPDT– 3 waySPDT– 3 way


S3

DPDT– 4 wayDPDT– 4 way


S4

BuzzerBuzzer


Outside telephoneOutside telephone


Interconnecting Interconnecting TelephoneTelephone


Battery-- SourceBattery-- Source


Unit 3- Schematic Symbols

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