Charger from subpanel with load management single line diagram
Garage subpanel feeds the charger through an energy management system. Use this when the charger is fed from a garage subpanel instead of the main panel, and the subpanel feeder is the limit. The EVEMS watches the feeder, not the service.
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What the reviewer checks on this drawing
The reviewer looks for the feeder rating, the point where its current is measured, and a subpanel with isolated neutrals and bonded equipment grounds.
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 | Branch breakers | |
| Load | Existing loads | ||
| Circuit breaker | 100A 2P | Feeder | |
| Panel | Garage subpanel | 100A MLO · 120/240V | 3 #3 Cu + #8 G |
| Circuit breaker | Existing | Garage circuits | |
| Load | Existing loads | ||
| Circuit breaker | 60A 2P | New | |
| Device | Energy management system (EVEMS) | CTs on subpanel feeder | |
| EV charger | Level 2 EVSE | 48A · 11.5 kW |
Notes on the sheet
- EVEMS monitors the subpanel feeder and interrupts the EVSE before the feeder rating is exceeded.
- Subpanel neutrals isolated from the enclosure; equipment grounds bonded.
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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