Pump (Motor-driven) Symbol
Definition: The Pump symbol represents an electrically driven pump — typically a pool pump or centrifugal pump — in wiring diagrams, depicted as a motor body rectangle combined with a pump impeller circle labelled 'P', with L1 and L2 supply connections, used in residential and commercial electrical and mechanical schematics to indicate a motor-driven fluid-circulation device.
Also known as: pool pump, centrifugal pump, pump motor, circulator pump, water pump.
What the Pump (Motor-driven) symbol means
The Pump symbol in an electrical wiring diagram indicates a motor-driven device that moves fluid (water, coolant, or other liquid) through a piping system. In residential wiring diagrams, this symbol most commonly represents a pool pump, spa pump, or irrigation pump drawing power from a dedicated 240 V AC circuit.
The symbol communicates both the electrical load characteristics (a single-phase or three-phase induction motor) and the mechanical function (fluid movement) in a single icon. Electricians use the pump symbol to identify the load on a circuit, size the overcurrent protection, and determine wiring requirements per NEC Article 430 (motor circuits) and NEC Article 680 (swimming pool, spa, and fountain installations).
How to identify the Pump (Motor-driven) symbol
The pump symbol combines two graphical elements: a rectangle (representing the motor body) connected by a short horizontal line to a circle (representing the pump head / impeller housing) with the letter 'P' inside the circle. Two lines enter the motor rectangle from the top, representing the L1 and L2 power supply conductors. This motor-plus-circle arrangement distinguishes the pump symbol from a plain motor symbol (rectangle alone) and from a fan symbol (rectangle with curved blade marks inside the circle).
Function in a circuit
The pump converts electrical energy to mechanical rotational energy via an induction motor, which drives an impeller inside the pump housing. The rotating impeller accelerates fluid by centrifugal force, increasing its velocity and pressure to circulate water through a pool filter system, cooling loop, or irrigation distribution network. Single-phase pump motors (used in residential pools) draw 1–3 kW from a 240 V AC supply; three-phase motors (used in commercial applications) provide higher efficiency and power factor. Variable-speed pool pump motors are increasingly required by energy codes to reduce consumption at partial flow.
Standards: IEC vs ANSI
| IEC 60617 | IEC 60617 covers the general motor symbol (rectangle with terminal lines); pump symbols are represented by combining the motor block with a circle or impeller annotation per IEC convention. IEC 60034 governs rotating electrical machines (motor performance). |
|---|---|
| ANSI/IEEE 315 | ANSI Y32.2 / IEEE 315-1975 defines the motor symbol and general machine symbols. NEC NFPA 70 Article 430 governs motor circuit wiring and protection; Article 680 governs pool and spa pump wiring specifically in North America. |
| Key difference | IEC and ANSI/IEEE symbols for pumps both use a motor rectangle combined with a circle representing the pump head; the visual convention is essentially identical. North American practice follows NEC Article 680 for pool pumps with specific bonding and GFCI requirements not found in IEC standards. |
Terminals / pins
| Pin | Name |
|---|---|
| l | L |
| n | N |
| gnd | GND |
Typical values
Residential pool pump: 0.75–3.7 kW (1–5 hp), 240 V single-phase, 60 Hz. Variable-speed pump: 0.2–3.7 kW across speed range. Full-load current: 3–16 A at 240 V. Circuit breaker: 15–30 A dual-pole. Wire size: 12 AWG or 10 AWG THWN copper in conduit.
Where the Pump (Motor-driven) symbol is used
- Residential in-ground and above-ground swimming pool filtration and circulation systems
- Spa and hot tub pump circuits for jets and circulation, requiring GFCI protection per NEC 680
- Irrigation system pump stations for lawn and garden sprinkler distribution
- Hydronic heating system circulator pumps for radiant floor and baseboard heating
- HVAC chilled water and condenser water pump circuits in commercial cooling systems
- Sump pump circuits in basement and crawlspace water management systems
Example
In a residential pool equipment drawing, the pump symbol appears with L1 connected to the 30 A dual-pole breaker in the sub-panel and L2 to the neutral bus, feeding a 2 hp (1.5 kW) single-phase pool pump motor through a GFCI circuit breaker and time-clock controller, with a bond wire connecting the pump motor housing to the pool bonding grid per NEC 680.26.
Key facts
- The Pump symbol in electrical wiring diagrams combines a motor-body rectangle with a circle labelled 'P' representing the pump head, with L1 and L2 supply connections at the top per ANSI Y32.2 / IEEE 315 motor block conventions.
- Residential pool and spa pumps are single-phase 240 V AC motors requiring a dedicated circuit with dual-pole overcurrent protection sized at 125% of the motor's full-load current per NEC 430.52.
- NEC Article 680 requires GFCI protection for all pump motors in swimming pool, spa, and fountain installations, and mandates bonding of all metal parts and the water itself within 5 feet of the water.
- Variable-speed pool pump motors are required by energy codes (e.g. California Title 20, NEC 680.21(C)) for pools over 3000 gallons capacity; they reduce energy consumption by up to 75% compared to single-speed pumps at reduced flow.
- The motor full-load ampere (FLA) rating is found on the pump nameplate and is used to size the wire, disconnect, and overcurrent device per NEC Article 430.
- Pool pump circuit wiring must run in conduit (rigid or PVC) and must be installed at least 18 inches below grade or 6 feet from the pool edge for any above-grade runs per NEC 680.
- The standard designator for a pump motor in electrical schematics is M (motor) or P (pump) followed by a number; in P&ID (piping and instrumentation diagrams) the pump is designated P- followed by an equipment tag number.
Diagrams that use this symbol
- fuel pump relay wiring diagram
- circuit diagram of water level indicator
- water level controller circuit diagram
- water level indicator diagram
- 4 pin fuel pump relay diagram
- fully automatic water level controller circuit diagram
Frequently asked questions
What does the pump symbol look like in a wiring diagram?
The pump symbol shows a motor rectangle connected by a short line to a circle containing the letter 'P'. Two power supply lines (L1 and L2) enter the motor rectangle from above. This motor-plus-circle combination distinguishes the pump from a standalone motor symbol.
What does the pump symbol mean in an electrical schematic?
The pump symbol indicates an electrically driven pump — most commonly a pool pump or centrifugal water pump — as the load on that circuit. It tells the reader that a motor-driven fluid-moving device is connected at that point, requiring motor circuit wiring and protection per NEC Article 430.
What circuit is required for a pool pump?
A residential pool pump requires a dedicated 240 V single-phase circuit with a dual-pole circuit breaker sized at 125% of the motor FLA per NEC 430.52. NEC 680.21 requires GFCI protection for the pump motor circuit and mandates bonding of the pump motor housing to the pool bonding grid.
What standard governs pool pump wiring?
NEC (NFPA 70) Article 680 governs swimming pool, spa, and fountain pump wiring in North America, covering GFCI requirements, wire routing, bonding, and equipotential bonding grid requirements. Motor circuit sizing follows NEC Article 430.
What are the electrical connections on a pump symbol?
The pump symbol shows two power supply connections: L1 (line 1, hot conductor) and L2 (line 2, hot conductor for 240 V single-phase). On three-phase pumps, three supply lines (L1, L2, L3) are shown. The motor housing ground (equipment grounding conductor) is implied but may be shown as a separate ground symbol.
What size wire is needed for a pool pump?
A typical 2 hp (1.5 kW) pool pump at 240 V single-phase draws approximately 10–12 A full-load current. NEC 430.22 requires wire sized at 125% of FLA, so 12 AWG copper conductors in conduit are commonly used for pumps up to 15 A FLA; 10 AWG is used for larger pumps up to 25 A FLA.
What is the designator letter for a pump in electrical drawings?
Pool and circulation pumps in electrical wiring diagrams are most commonly designated M (motor) or P (pump) followed by a number, such as M1 or P-101. In piping and instrumentation diagrams (P&IDs), the pump equipment tag follows ISA 5.1 conventions using a P- prefix with a loop number.
Place the Pump (Motor-driven) symbol on a wiring diagram or schematic in the free online circuit diagram maker — no download required.