Service and main panel upgrade to 200A single line diagram
New meter socket, service entrance and 200A panel. Use this for the most common service job: replacing a 100A service with a new meter socket, service entrance conductors and a 200A panel.
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 the service entrance conductor size, the grounding electrode system, what is being removed, and the disconnect and reconnect arranged with the utility.
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 | New meter socket | 200A · utility approved | New service drop, per utility |
| Circuit breaker | 200A 2P | Main breaker | Service entrance, 2/0 Cu or 4/0 Al |
| Panel | New main panel | 200A bus · 40 spaces | |
| Ground | Grounding electrode system | #4 Cu GEC | |
| Circuit breaker | Existing | Circuits re-terminated | |
| Load | Existing loads | ||
| Circuit breaker | Spare | Future |
Notes on the sheet
- Existing 100A service, meter base and panel removed.
- Service entrance conductor size shown per NEC 310.12; size per the adopted code.
- AFCI and GFCI protection added where existing circuits are modified or extended, as the AHJ requires.
- Coordinate the disconnect and reconnect with the utility.
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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