In addition to the sections found in NEC Art.220, there is additional information about load calculations in NEC “Annex D Examples”.įeel free to contact us with questions about residential load calculations. The NEC provides many methods of computing loads for residential occupancies. Electrical load calculation of panelboard This MS Excel spreadsheet has possibilities to calculate the following: Voltage / Voltage Difference of Each Phase Unbalanced Load in Neutral Wire. You are welcome to use these worksheets with your square footage measurements, your additional loads, and your HVAC loads to quickly and accurately determine your service requirements. Worksheet 5 uses the optional calculation found in NEC 220.84 and can be used for 3-family dwelling calculations (when the 3-family dwelling meets the qualifications of NEC 220.84).Select the Get Form option and open a template in the handy PDF editor. Worksheet 4 uses the “standard” method of calculation (NEC 220.1 through 220.61) and can be used for two-family dwelling calculations. For 3-Phase electrical load calculation, we use following formula. How to prepare Nec Electrical Load Calculation Worksheet 1 Open the document If you are looking for the editable Nec Electrical Load Calculation Worksheet sample, you might be at the right place.Worksheet 3 uses the optional calculation found in NEC 220.83 to compute the adequacy of the existing service when a room addition is built or other loads are added to an existing single-family dwelling.Worksheet 1 (heating load larger than A/C load) and Worksheet 2 (A/C load larger than heating load) use the optional calculation found in NEC 220.82 for a new single-family dwelling.Identifies peak room, zone, and coil loads. Calculates room and zone loads 24 hours a day for design days in all 12 months. These worksheets are provided to help you comply with the requirements of the Residential Code of Ohio when preparing your load calculations. Load Calculation Features Uses ASHRAE procedures for Radiant Time Series (RTS) or Transfer Function (TFM) cooling load calculations, design heating load calculations, solar radiation calculations. The automated worksheets accompanying this page are based on only five of the permitted methods of calculation found in NEC 220.

Commercial load calculation worksheet