These are physical or adhesive markers designed to be affixed to the pages of the 2017 edition of the National Electrical Code (NEC). Their purpose is to enable quick and efficient navigation within the extensive document. For example, an electrician might apply these to frequently referenced sections, such as those pertaining to grounding, wiring methods, or specific occupancies.
The application of these markers offers several advantages. They significantly reduce the time spent searching for specific code requirements during inspections or installations. This improved efficiency can lead to increased productivity and reduced labor costs. Historically, professionals relied on manual indexing and highlighting, but these provide a more organized and readily accessible system for locating vital information.