UPS with battery cabinet and critical panel single line diagram
40 kVA double-conversion UPS feeding a critical loads panel. Use this for a server room or other critical load on a 40 kVA double-conversion UPS with a battery cabinet and a critical loads panel.
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What the reviewer checks on this drawing
The reviewer checks the input breaker at 125% including battery recharge current, a maintenance bypass if the load cannot be dropped for service, and emergency power off and battery room ventilation.
What the drawing shows
Every device on the sheet, in the order power reaches it.
| Symbol | Label | Rating or detail |
|---|---|---|
| Device | Distribution panel (DP) | 120/208V 3φ 4W |
| Circuit breaker | 150A 3P | UPS input |
| Device | UPS (UPS) | 40 kVA · double conversion |
| Battery | Battery cabinet | 10 min at full load |
| Circuit breaker | 125A 3P | UPS output |
| Panel | Critical loads panel CP-1 | 125A · 120/208V 3φ 4W |
| Circuit breaker | 30A 3P | |
| Load | Rack PDU A | |
| Circuit breaker | 30A 3P | |
| Load | Rack PDU B | |
| Circuit breaker | 20A 1P | |
| Load | Network core |
Notes on the sheet
- 40 kVA at 208V = 111A. Input breaker sized at 125% including battery recharge current.
- Add an external maintenance bypass where the UPS must be serviced without dropping the load.
- Emergency power off and battery room ventilation per the adopted codes.
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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