LOCKED infrastructure
strategy correct
LDD-09 · Electrical System
One-line intent
Distributed, zone-aligned electrical with centralized service and localized subpanels — no over-centralized "smart house" dependency.
Locked decisions
- Service: 300A–400A target
- Main panel: laundry / operations core (north service zone)
- ILS subpanel: serves entire ILS independently
- Workshop / LOW subpanel: isolates high / variable loads
- EV-ready: 3 main garage bays + 2 ILS garage bays (conduit + reserved capacity)
- Solar-ready: grid-tied inverter space allocated
- Generator-ready: manual transfer switch + inlet
- HVAC: dedicated circuits per system
- Routing: conduit aligned with structure · parallel only · vertical drops only · no diagonals
Open items / engineer review
- Service size: 300A or 400A? Default to 400A given heat pumps + 5 EV bays + workshop
- EV charger level (Level 2 7.7kW vs 11.5kW vs 19.2kW)
- Generator size + fuel (propane / NG / diesel)
- Solar PV system size
- Surge protection at main + each subpanel — strongly recommended, not in current LDD
- Whole-house grounding strategy (PEMB metal shell)
Cost drivers
400A service entrance + main $8–15K · Two subpanels $4–8K · EV stub-outs $2–4K · Solar PV-ready $1–3K · Generator-ready $2–4K · Whole-house wiring + devices $60–95K. Total: $75–125K, budgeted at $110K.
Air-gap concerns
- Pick 400A now. Upgrading later = $8–15K + downtime.
- Missing low-voltage / structured wiring spec. Cat6 to TVs, APs, doorbell — easier in rough than retrofit.
- No surge protection — $400–1,200 installed; without it, low-voltage drivers + electronics at risk.
- Workshop subpanel undersized? "Future loads" is vague. Spec 100A min, 125A if welder/CNC possible.
- Generator gas line needs Phase 1 stub-out if propane/NG.
Cross-references
→ Outputs to
LDD-23 conduit discipline