Template · Service and panels

Well pump with constant-pressure drive single line diagram

Submersible pump on a variable frequency drive, with a disconnect within sight.

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.

Open this template in the editor Download the SVG

Well pump with constant-pressure drive single line diagram: submersible pump on a variable frequency drive, with a disconnect within sight. — Well pump with constant-pressure drive. 10 devices on an 11 × 17 in sheet with a title block and notes column.

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	120/240V 1φ 3W
Meter	Utility meter	200A socket	Service conductors, per utility
Circuit breaker	200A 2P	Main breaker
Panel	Main panel	200A bus · 120/240V
Circuit breaker	Branch breakers
To (continues off sheet)	To house loads
Circuit breaker	30A 2P	Well pump
Disconnect switch	Disconnect	30A · NEMA 3R, within sight of drive	2 #10 Cu + #10 G, 3/4" PVC
Variable frequency drive	Pump drive	2 HP · 18A input, 230V 1φ in · 3φ out
Motor	Submersible pump	2 HP · 230V 3φ, 8.1A max	3 #12 Cu + G, submersible pump cable

Notes on the sheet

Circuit to the drive sized from its rated input current: 18A × 125% = 22.5A, so #10 Cu on a 30A breaker.
Drive output current limit set to the motor nameplate maximum (8.1A). Motor overload protection is provided by the drive.
Pump cable sized for voltage drop over the full length to the pump, per the drive manufacturer table.

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.