DC fast charging site single line diagram
Dedicated 480V service with two 120 kW chargers and a site-loads transformer. Use this for a DC fast charging site with its own utility service: a transformer, a 480V switchboard, the chargers, and a small transformer for the site loads.
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 charger input current taken from the manufacturer’s data sheet with the branch circuits at 125%, the emergency shutoff and disconnect locations, and the bonding of the site-loads transformer as a separately derived system.
What the drawing shows
Every device on the sheet, in the order power reaches it.
| Symbol | Label | Rating or detail |
|---|---|---|
| Utility source | Utility primary | Per utility |
| Transformer | Pad-mount transformer | 500 kVA · 480Y/277V |
| Current transformer | CT cabinet | Utility metering |
| Circuit breaker | 600A 3P | Main |
| Panel | Switchboard SB-1 | 600A · 480Y/277V 3φ 4W |
| Circuit breaker | 200A 3P | DCFC-1 |
| Disconnect switch | Disconnect | 200A · NEMA 3R, lockable |
| EV charger | DC fast charger 1 | 120 kW · 160A input |
| Circuit breaker | 200A 3P | DCFC-2 |
| Disconnect switch | Disconnect | 200A · NEMA 3R, lockable |
| EV charger | DC fast charger 2 | 120 kW · 160A input |
| Circuit breaker | 30A 3P | Site loads |
| Transformer | Transformer T-1 | 15 kVA, 480V – 120/208V |
| Panelboard | Panel LP-1 | Lighting, network |
Notes on the sheet
- Charger input current from the manufacturer data sheet; branch circuit sized at 125% of continuous input.
- Emergency shutoff and disconnect locations per the AHJ and charger manufacturer.
- Transformer T-1 secondary bonded as a separately derived system.
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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