Load calculation check

Dwelling service sizing two ways — the standard method (Art. 220 Part III) and the optional method (§220.82) — plus conduit fill (Chapter 9) and derating (§310.15). Runs in your browser; nothing is stored. Put your shop's name on the sheet and print it for the job file.

1 · The building and its loads (volt-amperes)

Floor area (sq ft)		Small-appliance circuits
Laundry circuit		EV charger (VA)
Dryer (nameplate VA)		Range / cooktop (VA)
Air conditioning (VA)		Electric heat (VA)

Fixed appliances (nameplate VA each; the standard method applies the §220.53 demand factor when there are four or more):

Dishwasher Disposal Water heater Other

2 · Conduit fill (Chapter 9)

Conductors (THHN-2 areas, Table 5) against conduit inside area (Table 4). Limits: 53% for one conductor, 31% for two, 40% for three or more; 60% for a nipple 24 in. or less.

Run:

Conduit trade size nipple (≤24 in.)

3 · Derating (§310.15)

Conductor insulation ambient current-carrying conductors

4 · White-label sheet

Shop name Phone Job

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Reference only. Compiled from the cited official sources as of the date shown; adoptions and rules change. Confirm with the authority having jurisdiction before designing or permitting work.