Wiring Colors & Symbols

Colors

Wiring Diagram example
Example of a wiring diagram.

Wiring diagrams are typically colored with lines representing the following:

  •      Red = Control Circuit(s)
  •      Blue = Neutral Wire
  •      Green = Ground Wire
  •      Black/White (varies on background) = Power Source

Symbols

Download Wiring Symbol Chart (PDF, 768.7 KB)

Symbol Description
Auto-Off Selector Switch
Auto-Off-Continuous Selector Switch
Lead-Off-Lag Selector Switch
Lead-Off-Lag-Continuous Selector Switch
Float-Off-Float and Vacuum Continuous Selector Switch
Disconnect
Starter, Single-Phase with a Set of Two Overloads
Starter, Three-Phase with a Set of Three Overloads
Starter Coil with Three Overloads
Transformer to Reduce Supply Voltage to 115 volts for Control Circuit Operation
Relay with Two Normal Open and Two Normal Closed Contacts
Electric Alternator Alternates Between Two Pumps Equalizing Operation Time
Single Pole, Single Throw Float Operated Switch to Turn Pumps On and Off
Double Pole, Single Throw Float Operated Switch to Turn Pumps On and Off
Pump Motor
Fuses
Circuit Breaker
Alarm Bell for Use with High and Low Water Conditions
Low Water Cut-Off Switch, Normally Closed for Use with Electrical Panel with One Transformer
Low Water Cut-Off Switch, Normally Open for Use with Electrical Panel with Two Transformers
Pilot Light to Indicate Power On or System Operation
Terminal Block
Float Switch and Solenoid for Adding Make-up Water
Vacuum Switch
Temperature Limit Switch
End Switch
Mechanical Alternator, Mechanically Alternates Between Two Pumps to Equalize Operation Time
Push Button for Momentary Make of Electrical Circuit. Used as Test Button or Push to Silence in Alarm Circuit.