Template · Generators

Standby generator riser single line diagram

Outdoor service disconnect, automatic transfer switch in the garage and a standby generator in the side yard.

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.

Open this template in the editor Download the SVG

Standby generator riser single line diagram: outdoor service disconnect, automatic transfer switch in the garage and a standby generator in the side yard. — Standby generator riser. 10 devices on an 11 × 17 in sheet with a title block and notes column.

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	Service disconnect	3 #2/0 Cu
Transfer switch	Automatic transfer switch	200A · not service rated	3 #2/0 Cu + #6 G, 2" PVC
Circuit breaker	100A 2P	Generator breaker
Generator	Standby generator	22 kW · natural gas, 120/240V	3 #3 Cu + #8 G, 1-1/4" PVC
Circuit breaker	200A 2P	Main breaker	3 #2/0 Cu + #6 G
Panel	Main panel	200A bus · neutrals isolated
Circuit breaker	Branch breakers
To (continues off sheet)	To all house loads

Notes on the sheet

Service disconnect on the garage exterior wall is the service disconnect and emergency disconnect. Grounding electrode conductor and main bonding jumper terminate there.
Feeder to the transfer switch and main panel is four-wire: neutrals isolated and the bonding screw removed in the main panel.
Service and feeder conductors: 3 #2/0 Cu at 175A ≥ 83% × 200A = 166A for a dwelling service.
Generator 22 kW ÷ 240V = 92A, protected at 100A on #3 Cu (100A at 75 °C).
Load shedding modules added if the calculated load exceeds the generator rating.

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.