Typical single-line diagram for a 400A, 120/240V, single-phase, 3-wire residential service using a two-position compartmentalized multi-meter (Square D MP Meter-Pak) serving a 200A main house and a 100A ADU, with a BESS-ready backup load panel at the house. Shows the two service disconnects, service and feeder conductor sizes in copper and aluminum, surge-protective devices, PV-ready backfeed breaker, ADU separate-structure requirements, 2025 California Energy Code BESS-ready provisions, and grounding electrode system per NEC 2023. PDF and editable DWG.

Typical single-line diagram for a 400A, 120/240V, single-phase, 3-wire residential service using a two-position compartmentalized multi-meter (Square D MP Meter-Pak) serving a 200A main house and a 150A ADU, with BESS-ready backup load panels at the house and ADU. Shows the two service disconnects, service and feeder conductor sizes in copper and aluminum, surge-protective devices, PV-ready backfeed breaker, ADU separate-structure requirements, 2025 California Energy Code BESS-ready provisions, and grounding electrode system per NEC 2023. PDF and editable DWG.