Single line diagram

Electrical single line diagram showing the connectivity from the utility grid and meter through a main panel to an automatic transfer switch (ATS) and a portable generator. Details include conductor and conduit specifications and a plan for a main panel upgrade.

Diagram notes and component specifications

  • Utility grid: Existing 120/240V 1-phase 60Hz.
  • Utility meter (M).
  • Main panel: (E) 125A end-fed main panel with an (E) 100A main breaker.
  • Main panel upgrade: Replace existing main service panel with a new 100/100A main panel.
  • New component: (N) BRS225 2-pole lug block for existing building/home loads.
  • Automatic transfer switch: (N) Automatic Transfer Switch 100A, double pole double throw, mounted next to the main panel.
  • Portable generator: (N) Generac G007042-2 22KW generator.
  • Conductors from main panel to ATS: (3) 1/0 AWG conductors and (1) 8 AWG ground inside 2-inch EMT conduit.
  • Conductors from generator to ATS: (3) 4 AWG conductors and (1) 8 AWG ground inside 1-1/4 inch EMT conduit.
  • Grounding: (E) Ground electrode.
  • Operational note: Interrupt wires from loadside to ATS.

Customer information

Contact and location details for the project
Field Information
Name John Doe
Address 100 Main Street, San Rafael, CA 94901
APN 000-000-00
AHJ CA- City San Rafael

Drawing metadata

Identification and technical data for this sheet
Attribute Value
Designer/Checked by None
Scale As noted
Date None
Sheet number E-1