NEC 220.82 Optional Method2,500 Sq Ft • Modern Decarbonized Single-Family HomeCode Compliant
All-Electric Home Service Load Calculation for 2,500 Sq Ft
Complete electrical demand load breakdown following NEC Article 220.82. Formally verified for electrical permit submissions, service disconnect sizing, and utility service drop requirements.
Calculated Demand148.1 Amps@ 240V Single Phase
Recommended Panel200 AmpsNEC Standard Rating
Service Feeder (Al)4/0 AWGTable 310.12 (75°C)
Minimum Conduit2"EMT / PVC Sch 40
Connected Appliance Profile & Nameplate Loads
Specific mechanical equipment ratings evaluated for this residential dwelling unit
Cooking EquipmentInduction Cooktop & Double Wall Oven (14,000 VA)
Clothes DryerHeat Pump Dryer (1,500 VA)
Water HeatingHeat Pump Water Heater (1,500 VA)
HVAC Primary Heating/Cooling4-Ton Cold-Climate Inverter Heat Pump (6,500 VA)
Electric Vehicle Supply (EVSE)40A Level 2 EVSE (9,600 VA)
Auxiliary Fixed AppliancesDishwasher (1,500 VA), Disposal (900 VA), Microwave (1,200 VA), Sump Pump (1,000 VA)
NEC 220.82 Step-by-Step Demand Worksheet
Official calculation table matching municipal electrical permit application format
| Calculation Step • NEC Section | Connected VA | Demand Factor | Demand VA |
|---|---|---|---|
| General Lighting & Receptacles3 VA/sq ft • NEC 220.82(B)(1) | 7,500 VA | Subtotal Group | — |
| Small Appliance Circuits2 Circuits @ 1,500 VA • NEC 220.82(B)(2) | 3,000 VA | Subtotal Group | — |
| Laundry Branch Circuit1 Circuit @ 1,500 VA • NEC 220.82(B)(2) | 1,500 VA | Subtotal Group | — |
| Fixed & Fastened-in-Place AppliancesRange, Dryer, WH, DW, Disposal • 220.82(B)(3) | 21,600 VA | Subtotal Group | — |
| General Connected Load Subtotal | 33,600 VA | — | — |
| • First 10,000 VA of General Load | 10,000 VA | 100% | 10,000 VA |
| • Remainder above 10,000 VA | 23,600 VA | 40% | 9,440 VA |
| General Demand Load Subtotal | — | 220.82(B) | 19,440 VA |
| Heating & Air Conditioning (HVAC)Largest Non-Coincident Load • NEC 220.82(C) | 6,500 VA | 100% | 6,500 VA |
| Electric Vehicle Charger (EVSE)Continuous Load • NEC 625.42 | 9,600 VA | 100% / 125% | 9,600 VA |
| TOTAL CALCULATED DEMAND LOAD | — | Total / 240V | 35,540 VA • 148.1 A |
Service Conductor & Grounding Sizing Schedules
Minimum wire gauges and raceway sizes compliant with NEC Table 310.12 and Table 250.66
Service Entrance Conductors
Copper Conductor (THHN/XHHW):2/0 AWG Copper THHN
Aluminum Conductor (XHHW-2):4/0 AWG Aluminum XHHW-2
Minimum Raceway / Conduit:2" EMT / PVC Sch 40
Temperature Rating:75°C Terminations
Grounding & Bonding Electrode System
GEC to Water Pipe / Intersystem:#4 AWG Bare Copper
Ground Rod System:Dual 5/8" × 8ft Rods (6ft Spaced)
GEC to Ground Rods (Max):#6 AWG Copper
Main Bonding Jumper:Installed at Main Disconnect Only
Master Electrician Inspection & Installation Notes
- Calculated demand load is 148.1A, fitting comfortably within standard 200A service capacity.
- Conductor requirements: 2/0 AWG copper or 4/0 AWG aluminum conductors rated at 75°C.
- Electrician tip: Ensure the 40A EV charger circuit is wired with #8 THHN copper in conduit or #6 NM-B Romex.
Frequently Asked Code Questions
Does a 2,500 sq ft all-electric home require 300 or 400 amp service?
No. With modern heat pump HVAC and water heating, calculated demand is approximately 148A, leaving over 50A of headroom on a standard 200A panel.
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