The NJATC’s Guide to National Electric Code Calculations 2005 NEC is a textbook authored by NJATC and NEC, providing comprehensive information on the National Electrical Code calculations. Published in 2005, this book serves as a valuable reference for individuals seeking to understand and comply with the requirements of the National Electric Code. With its detailed explanations and calculations, this guide is essential for those in the electrical industry looking to enhance their knowledge and expertise in this field.