Generator with manual transfer switch single line diagram
Ten-circuit manual transfer switch with an inlet box. Use this for a portable generator feeding a manual transfer switch that carries up to ten chosen circuits, with the rest of the panel left on utility power only.
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What the reviewer checks on this drawing
The reviewer checks that the transferred circuits do not exceed the generator rating, and that the transfer switch is listed for the use and mounted beside the main panel.
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 | Existing | Non-transferred loads | |
| Load | Existing loads | ||
| Circuit breaker | 60A 2P | Transfer switch feed | |
| Transfer switch | Manual transfer switch | 60A · 10 circuits | |
| Power inlet | Power inlet box | 30A · L14-30 | |
| Generator | Portable generator | 7.2 kW | |
| Load | Selected circuits | Returned to panel branch wiring |
Notes on the sheet
- Transferred circuits selected so connected load does not exceed the generator rating.
- Transfer switch listed for the application and installed adjacent to the main panel.
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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