Fire pump service single line diagram
Tap ahead of the building main to a listed fire pump controller. Use this for an electric fire pump supplied from a tap ahead of the building main, through a listed fire pump controller.
A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.
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What the reviewer checks on this drawing
The reviewer checks the supply arrangement against NEC Article 695 and NFPA 20, or CEC Section 32; overcurrent protection that can carry the motor’s locked-rotor current indefinitely; and a supervised disconnect locked in the closed position.
What the drawing shows
Every device on the sheet, in the order power reaches it.
| Symbol | Label | Rating or detail | Conductors feeding it |
|---|---|---|---|
| Utility source | Utility service | 480Y/277V 3φ | |
| Device | Service tap (TAP) | Ahead of building main | |
| Circuit breaker | 800A 3P | Building main | |
| Panelboard | Main switchboard | Building loads | |
| Fused disconnect | Fire pump disconnect | Service rated, lockable, sized for locked rotor | |
| Device | Fire pump controller (FPC) | Listed · 50 HP | Feeder outside bldg, or 2-hour protected |
| Motor | Fire pump | 50 HP · 460V · 65A FLA |
Notes on the sheet
- Fire pump supply arranged per NEC Article 695 and NFPA 20, or CEC Section 32.
- Overcurrent protection sized to carry the locked-rotor current of the fire pump motor indefinitely.
- Disconnect supervised, locked in the closed position and labelled "Fire pump disconnecting means".
Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.
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