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Commercial load calculation worksheet5/17/2023 ![]() 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). Worksheet 4 uses the “standard” method of calculation (NEC 220.1 through 220.61) and can be used for two-family dwelling calculations. 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. These worksheets are provided to help you comply with the requirements of the Residential Code of Ohio when preparing your load calculations. ![]() The automated worksheets accompanying this page are based on only five of the permitted methods of calculation found in NEC 220. IBI Residential Load Calculations Worksheets 1-5
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