electrical wiring diagram symbols-rev
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Electrical Wiring Diagram Symbols
87 terms by keith_spring
Electrical Wiring Diagram Symbols commonly found in HVAC wiringdiagrams
High Voltage, Factory Wired
Low Voltage, Factory Wired
High Voltage, Field Wired
Low Voltage, Field Wired
High Pressure Switch,Normally Closed
Opens on increase (rise)/Closes on decrease (drop)vacuum & ressure activated
Low Pressure Switch Normally Open Closes on increase
(rise)/Opens on decrease (drop) (vacuum & pressure activated)
Cooling ThermostatNormally OpenCloses on increase (rise)/Opens on decrease (drop)(temperature activated)
Heating ThermostatNormally Closed Opens on increase (rise)/Closes on
decrease (drop)(temperature activated)
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High Liquid Level SwitchNormally Closed Opens on increase (rise)/Closes ondecrease (drop)(liquid level activated)
Low Liquid Level SwitchNormally Open Closes on increase (rise)/Opens ondecrease (drop)(Liquid Level activated)
Flow Switch (positive)Normally Open
Closes on flow or movement(air, water, liquid flow or movement)
Flow Switch (negative)Normally ClosedOpens on flow or movement(air, water, liquid flow or movement)
Normally Open Contacts
Normally Closed Contacts
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Magnetic Circuit Breaker
Series Trip
Disconnect Switch
Thermal Circuit BreakerSeries Trip
Normally Open
Spring ReturnLimit Switch
Normally Closed
Spring Return
Limit Switch
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Held ClosedSpring ReturnLimit Switch
Held OpenSpring Return
Neutral PositionSpring ReturnLimit Switch
Maintained PositionLimit Switch
Selector Switch
Slide Switch
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Cam Activated Swtich
Cam Activated Switch
Double Pole Double Throw Switch
Single Pole Double Throw 3 Position Switch
Single Pole Double Throw Switch
Single Pole Single Throw Switch
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Push ButtonNormally OpenSingle CircuitMomentary, Spring Return
Push ButtonNormally ClosedSingle CircuitMomentary, Spring Return
Momentary Push ButtonDouble CircuitMomentary, Spring Return
Maintained Push Button
Double Circuit
Normally OpenedEnergized Time ContactContactaction retarded when coil is
ENERGIZED
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Normally Closed EnergizedTime ContactContact action is retardedwhen coil is ENERGIZED
Normally Open De-energizedTime ContactContact action is retardedwhen coil is DE-ENERGIZED
Normally Closed De-energizedTime ContactContact action is retardedwhen coil is DE-ENERGIZED
Fixed ResistorGlow CoilStrip Heater
Variable Resistor
Tapped Resistor
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Thermistor
Heater type Resistor
Transformer (variants)
Capacitor
Coil (variants)
Fuse
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Ground Connection
Thermal Overload
Thermocouple
Light
Multiple Conductor Cable
Fusible Link
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Bi-Metal Switch
Connectors
ElectrodeIgnitor
Crank Case Heater
Meter
Variable Inductor
Fixed Inductor
Solenoid
Multi Pole Double Throw Switch
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Transformer - Auto AdjustableTapped
Foot SwitchNormall O en
Variable Transformer
Foot SwitchNormally Closed
Current Transformer
Electrically Operated Switch* Indicates magnetic coil,motor, orthermal element
Auto Transformer
Multi Pole Single Throw Switch
Fixed Iron Core Coil
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Fixed Air Core Coil
Adjustable Iron Core Coil
Adjustable Air Core Coil
MotorSingle Phase2 Lead
Motor Single Phase 3 Lead
Motor 3 Phase 3 Lead
Motor 3 Phase 6 LeadDual Windings
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Headset
Horn or Siren
Bi-Metallic Thermal Overload
Diode
Bi-Metallic Thermal Overload
with heater
Microphone
Headset
Horno r siren
Buzzer or bell
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Push to Test Lamp
Shielded Cable
Push to Test Lamp