Service Entrance Demand Load (Standard Method)

NEC Article 220 Standard Method demand-factor walk; recommended service ampacity from the standard ladder.

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Formula and source

Standard Method per NEC 220.42 (general lighting demand factors: first 3000 VA at 100%, next 117000 VA at 35%, remainder at 25%); 220.53 (fixed appliances 75% if 4+ items in branch); 220.54 (dryer 5000 W or nameplate, whichever is greater); 220.55 (range simplified); 430.24 (largest motor at 125%); 220.60 (HVAC larger of cooling vs. heating). Service A = total_VA / V; recommended service from the NEC 100/125/150/175/200/225/300/400 ladder.

NEC 2023 (NFPA 70). Article 220 (Branch-Circuit, Feeder, and Service Load Calculations).

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