The fourth of four volumes relating to the book title, “The 2011 National Electrical Code Book of In-Depth Calculations”. This volume consist of worksheets which sole purpose is to familiarize the user with the necessary guidelines and procedures for performing load calculations as required by the National Electrical Code. As a whole, these worksheets provide detailed instructions for calculating both standard and optional load calculations for single and multifamily dwellings along with other worksheets that are second-to-none for performing commercial and industrial load calculations and affiliated utilization equipment. Volume 4 also contain worksheets relating to Sections 220.54 and 220.55 (Household Electric Clothes Dryers and Household Range and Other Cooking Appliances). Overall, this volume of worksheets is an honest and best-effort representation of the author’s desire to assist the users with exclusive NEC requirements where electrical calculations are necessitated.