- The spreadsheet calculates the total electrical load for a residential dwelling using NEC (National Electrical Code) Article 220 methods.
- Step 1 calculates the general lighting and small appliance load based on square footage and fixed loads, applying demand factors per NEC 220.42 & 220.52.
- Step 2 calculates the heating or air conditioning load, selecting the larger of the two as per NEC 220.60 & 220.61.
- Step 3 lists all fixed appliances (range, dryer, water heater, etc.) and applies specific demand factors from NEC 220.53 for appliances over 1,500 VA.
- Step 4 calculates the cooking equipment load using NEC 220.54, which allows demand factors based on the number of units.
- Step 5 sums the calculated loads from Steps 1–4 to determine the total connected load, then applies the appropriate demand factor to find the minimum service rating required.
- The sheet also separates line and neutral demands and provides space for user notes and company information.
Parent Tip: Review the logic above to help your child master the concept of standard electrical load calculation worksheet.
