Unit 3- Schematic Symbols EET 110 Electronics Survey I

Topics to Cover Types of representations Types of representations Symbols for blueprint drawing Symbols for blueprint drawing Symbols for electrical schematics Symbols for electrical schematics

Representations Prints Prints Clearly show Clearly show –Types of electric devices and conductors –Where they are located –How they are connected to each other Supplied by builder, archetect, owner or electrician Supplied by builder, archetect, owner or electrician

Representations -Prints S

Representations (cont.) Schematics Schematics –Clearly show Types of devices and conductors Types of devices and conductors Where they should be located Where they should be located Electrical Connections Electrical Connections –Typically for controls or equipment –Provided by engineer, manufacturer

Representations -Schematics Source

Representations (cont.) Pictorials Pictorials –Clearly show Types of devices and conductors Types of devices and conductors Where they should be located Where they should be located How they are connected together How they are connected together Electrical connections Electrical connections Detail inside each box Detail inside each box –Not used in industry due to complexity

Representations -Pictorial

Junction Box Commonly Called a J-Box Commonly Called a J-Box Used for: Used for: –Code requires all splices in a box –Saves labor –Saves time –Saves cost

Junction Box Print SchematicPictorial J

Lamp Holder Print SchematicPictorial L

Pull Switch Print SchematicPictorial S

Duplex Convenience Receptacle. Print SchematicPictorial

Split Duplex Convenience Receptacle. Print SchematicPictorial S

Convenience Receptacle other than Duplex Print SchematicPictorial 3 Number indicates the number of receptacles (1, 3, etc.) 3

Weatherproof Receptacle WP Print SchematicPictorial

240 V Receptacle Print SchematicPictorial

Range Receptacle Print SchematicPictorial R R

Drier Receptacle Print SchematicPictorial D D

Ground Fault Circuit Interrupter GFCIs open if current leakage to ground exceeds.006 A GFCIs open if current leakage to ground exceeds.006 A Normally the current going to the appliance (hot) and the current returning to the source (neutral) are equal Normally the current going to the appliance (hot) and the current returning to the source (neutral) are equal Any fault grater than.006A opens and deenergizes the circuit. Any fault grater than.006A opens and deenergizes the circuit.

GFCI Print SchematicPictorial GFCI

Floor Receptacle Print SchematicPictorial

Push Button Switches Normally Open Normally Closed Print SchematicPictorial S

SPST– 2 way Print SchematicPictorial S

SPDT– 3 way Print SchematicPictorial S3S3

DPDT– 4 way Print SchematicPictorial S4S4

Buzzer Print SchematicPictorial

Outside telephone Print SchematicPictorial

Interconnecting Telephone Print SchematicPictorial

Battery-- Source Print SchematicPictorial