
Colors

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