How is material that has changed in the NEC from the previous edition indicated?

In the National Electrical Code (NEC), changes made from a previous edition are indicated with gray shading and/or a bracketed line. This visual distinction allows users to easily identify and recognize revisions or new requirements at a glance. Gray shading highlights an entire section or paragraph that has undergone modification, while a bracketed line can also point out specific additions or changes, ensuring clarity.

This method of marking changes is important for professionals working with the NEC, as it helps maintain awareness of updates that may affect compliance, safety, and installation practices. By using this consistent formatting, the NEC enhances usability and fosters a better understanding of essential code requirements.