A 26-chapter interactive guide built from a complete, real-world single-family home electrical drawing set: a 400A service entrance and NEC load calculation, grounding and bonding, main and subpanel schedules, floor-by-floor power, lighting, and branch-circuit plans, kitchen and HVAC circuits, garage/EV/generator systems, and voltage drop, surge protection, low-voltage cabling, commissioning, and electrical closeout documentation. Every drawing gets its own full-size slide so panel schedules, circuit numbers, and calculated values stay legible.
Five parts trace one house from the meter to the punch list. Part A (Chapters 1–4) covers the one-line system architecture, the 400A underground service entrance, the NEC Article 220 load calculation, and the grounding and bonding system under NEC 250. Part B (Chapters 5–8) covers the 400A main distribution panel schedule, the lighting/HVAC/garage/critical-loads subpanel schedules, the feeder and conductor summary, and a short-circuit analysis of the service and panel buses. Part C (Chapters 9–15) works floor by floor through first- and second-floor power plans, branch-circuit plans, lighting plans, and the basement branch-circuit plan. Part D (Chapters 16–21) covers the whole-house receptacle plan, kitchen appliance circuits, the HVAC electrical schematic, the garage/workshop subpanel, EV charger load management, and the outdoor generator and landscape plan. Part E (Chapters 22–26) covers voltage drop calculations, Type 1/2/3 surge protection, low-voltage structured cabling, the commissioning workflow, and the final electrical closeout turnover package.
Use the Prev / Next buttons at the bottom, or press the arrow keys on your keyboard. Click the ☰ menu button in the top-right to open the table of contents and jump to any of the 52 sections. Each chapter's reference drawing follows immediately after its text as its own dedicated, full-size slide, so panel schedules and circuit tables stay readable before you move to the next chapter.
Electrical contractors and residential designers who want a structured, real-drawing-set reference for how a 400A service, panel schedules, and branch circuits fit together on an actual project; electricians and apprentices studying panel schedule reading, NEC load calculations, and dedicated-circuit requirements; and engineering students and PE/electrician exam candidates who want to see NEC concepts — demand factors, voltage drop, grounding and bonding, surge protection tiers — applied to one coherent, fully worked residential design.
A 400A service is sized using the NEC Article 220 load calculation: general lighting, small appliance, and receptacle loads are totaled and reduced with demand factors, every fixed appliance (range, dryer, water heater, HVAC, EV chargers) is added at its own NEC-specified demand factor, and solar PV backfeed or battery storage capacity can be credited against the total per NEC 705.12. In this guide's example, a 125,400 VA connected load reduces to an 89,260 VA demand load — a 372A demand current, comfortably within a 400A service at 93% utilization.
A panel schedule lists every circuit position (odd/even pairs sharing a 2-pole breaker, or single positions for 120V circuits), its breaker size, a description of what it feeds, its connected VA load, and — on more detailed schedules — the conductor size, conduit type, and demand factor applied. Reading down the schedule tells you exactly what trips when a specific breaker trips, and totaling the connected and demand columns confirms the panel and its main breaker or main lugs are sized correctly for everything connected to it.
NEC 210.52(B) requires at least two 20A small appliance branch circuits (SABCs) to serve every countertop receptacle outlet in a kitchen, dining room, and similar areas, kept separate from lighting and general receptacle circuits. These circuits must be GFCI-protected, and major kitchen appliances — refrigerator, dishwasher, disposal, microwave, and range — each get their own dedicated circuit rather than sharing the SABCs.
A Level 2 EVSE typically needs a dedicated 240V circuit sized per NEC 625.42 at 125% of the charger's rated current for continuous duty — commonly a 40A or 50A, 2-pole breaker for a 32A or 40A-rated charger — plus a disconnecting means within sight of the equipment per NEC 625.43. Where a home has multiple EV chargers or limited service capacity, a load management system with current transformers on the main bus can dynamically throttle charger output instead of requiring a larger electrical service.
Type 1 SPDs install on the line side of the service equipment and protect against large external transients like lightning strokes and utility switching events. Type 2 SPDs install inside distribution panelboards, on the load side of the main breaker, to catch residual transient energy before it reaches branch circuits. Type 3 SPDs install at individual receptacles or equipment locations, providing the finest level of protection for sensitive electronics. All three are typically listed to UL 1449 and are commonly layered together rather than used alone.
Disclaimer: This guide illustrates general residential electrical design concepts using an illustrative example project for educational purposes only. All projects, firms, and individuals depicted are fictional. Always consult a licensed electrical contractor or professional engineer and the applicable edition of the National Electrical Code and local amendments for actual project design, permitting, and installation.