400A Multi-Meter, 200A House + 100A ADU

400A Multi-Meter, 200A House + 100A ADU

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Typical single-line diagram for a 400A, 120/240V, single-phase, 3-wire residential service using a two-position multi-meter (Square D MP Meter-Pak) serving a 200A main house and a 100A 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, and grounding electrode system per NEC 2023. PDF and editable DWG.

Specifications

Phase
Single Phase
Voltage
240
Recommended Electrical Service
200-400
Building/Main Breaker
200A House + 100A ADU
Main Breaker Poles
2
Main Feeder Wire Size
3#600 kcmil CU or (2) sets 3#250 kcmil AL
Number of Units
2