NEC Handbook

70HB14This Web site contains additional material for the 2014 National Electrical Code Handbook. Users of the handbook can refer here to background reading or added applications to help clarify Code text. Much of the content here consists of practical examples of calculation methods, which we can keep updated and add to over time. We will also keep users updated with errata and Tentative Interim Amendments and any other changes or new items, providing up to the minute coverage of breaking NEC® issues. We hope you find this Web site to be a valuable supplement to your handbook.

Examples and Tables

Engineered Approach to Conductor Ampacity
The inside front cover of your 2014 National Electrical Code Handbook outlines the process of using the Neher-McGrath formula to determine conductor ampacity. The full formula, however, is too complex to contain in the space allotted. Get more detailed information on the Neher-McGrath formula.