Motor branch circuit with VFD single line diagram
Drive, shielded cable and a motor disconnect within sight. Use this for one motor on a variable frequency drive, with shielded cable and a disconnect within sight of the motor.
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 branch protection sized from the drive’s input rating, the disconnect’s auxiliary contact wired to stop the drive before the disconnect opens, and the cable shield termination.
What the drawing shows
Every device on the sheet, in the order power reaches it.
| Symbol | Label | Rating or detail | Conductors feeding it |
|---|---|---|---|
| Device | From MCC or panel (MCC) | 480V 3φ | |
| Circuit breaker | 40A 3P | Branch protection | |
| Device | Variable frequency drive (VFD) | 15 HP · 480V | 3 #8 Cu + #10 G |
| Disconnect switch | Motor disconnect | 30A · within sight of motor | Shielded VFD cable, 3 #10 + G |
| Motor | Motor | 15 HP · 460V · 21A FLA |
Notes on the sheet
- Branch protection sized from the drive input rating and manufacturer instructions.
- Disconnect auxiliary contact wired to the drive enable so the drive stops before the disconnect opens.
- Cable shield terminated at both ends per the drive manufacturer.
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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