NEC 2023 Article 220: 220.12 general lighting load by occupancy (Table 220.12): dwelling 3 VA/sf, office 3.5 VA/sf, retail 1.5 VA/sf. 220.14 receptacle loads: 180 VA per general receptacle outlet. 220.52 small appliance and laundry loads: 2 circuits at 1,500 VA each (small appliance), 1 circuit at 1,500 VA (laundry). 220.40 general method: sum all loads, apply demand factors (Table 220.42 lighting demand: first 3,000 VA at 100%, next 117,000 at 35%, remainder at 25%). 220.82 optional calculation for dwellings: 100% of first 10 kVA, 40% of remainder + largest motor. Example: 2,500 sf home = 7,500 VA (lighting) + 3,000 VA (small appliance) + 1,500 VA (laundry) + fixed appliances = total demand. Minimum 100A service for single-family dwelling.