NEC 220.82 Optional Method2,500 Sq Ft • Large Single-Family HomeCode Compliant
200 Amp Service Load Calculation for 2,500 Sq Ft Home
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 Demand115.2 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 EquipmentDouble Oven & Induction Cooktop (14,000 VA)
Clothes DryerElectric Dryer (5,000 VA)
Water HeatingElectric Storage Tank (4,500 VA)
HVAC Primary Heating/Cooling3.5-Ton Central AC (5,600 VA) + Gas Furnace (1,000 VA)
Electric Vehicle Supply (EVSE)None Configured
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) | 28,100 VA | Subtotal Group | — |
| General Connected Load Subtotal | 40,100 VA | — | — |
| • First 10,000 VA of General Load | 10,000 VA | 100% | 10,000 VA |
| • Remainder above 10,000 VA | 30,100 VA | 40% | 12,040 VA |
| General Demand Load Subtotal | — | 220.82(B) | 22,040 VA |
| Heating & Air Conditioning (HVAC)Largest Non-Coincident Load • NEC 220.82(C) | 5,600 VA | 100% | 5,600 VA |
| TOTAL CALCULATED DEMAND LOAD | — | Total / 240V | 27,640 VA • 115.2 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
- Demand load is 115.2A, utilizing 57.6% of the 200A service rating.
- Ample capacity remains for an EV charger (up to 48A continuous) and basement finishing.
- Standard 2" trade size conduit is required to accommodate 4/0 aluminum conductors.
Frequently Asked Code Questions
What is the grounding electrode conductor size for a 200 amp service?
Per NEC Table 250.66, a 200A residential service with 2/0 copper or 4/0 aluminum conductors requires a #4 AWG copper grounding electrode conductor (GEC) to ground rods and water pipes.
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