Service and panel single line diagrams
A service single line diagram shows the path from the utility through the meter and the service disconnect to the panels: the service size, the main breaker, the bus rating, the feeders, and the grounding and bonding. It is the drawing most often asked for with a service upgrade, a panel change or a new subpanel.
The templates cover a 200A service upgrade, a panel upgrade with a new grounding electrode system, a subpanel addition, a feeder to a detached garage or ADU, a 400A service with two 200A panels, and a meter-main with feed-through lugs.
6 service and panel single line diagram templates
Service and main panel upgrade to 200A
New meter socket, service entrance and 200A panel.
ServiceView drawing
Panel upgrade with grounding system replacement
New panel with rods, water bond and intersystem bonding.
ServiceView drawing
Subpanel addition
100A four-wire feeder to a new subpanel.
ServiceView drawing
Feeder to detached garage or ADU
Underground feeder, building disconnect and local grounding electrode.
ServiceView drawing
400A service with two 200A panels
Class 320 meter socket feeding two main panels.
ServiceView drawing
Meter-main with feed-through lugs
Outdoor meter-main feeding large loads and the interior panel.
ServiceView drawingWhat the reviewer looks for
- The service voltage, phase and amp rating, and the meter socket rating.
- The service disconnect: where it is, its rating and how many there are.
- Service entrance and feeder conductor sizes, with the raceway.
- Grounding electrode conductors, the main bonding jumper, and where neutrals are isolated in subpanels.
- For a detached building: the four-wire feeder, the building disconnect and the local grounding electrode.
The ratings on the templates are typical values, not a design for your job. Confirm what your authority having jurisdiction and your utility expect before you submit.
Questions about service and panel drawings
What does a 200 amp service single line diagram show?
The utility service at 120/240V single-phase, the meter socket, the 200A main breaker, the panel with its bus rating and branch breakers, the service entrance conductor size and the grounding electrode system. Larger loads such as an EV charger or a subpanel feeder are drawn as their own breakers.
How is a subpanel shown on a single line diagram?
As a breaker in the main panel feeding a second panel through a four-wire feeder. The feeder is labelled with its conductor sizes, and a note states that the subpanel neutral bar is isolated from the enclosure and the equipment grounding bar is bonded to it.
Other single line diagram templates
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