Quick Hits

Article 110 is one of the most important sections of the National Electrical Code (NEC). It establishes the general requirements that apply to virtually every electrical installation, making it a foundational article for electricians, inspectors, apprentices, and anyone studying the Code.

This article covers the proper examination, approval, installation, operation, and maintenance considerations for electrical equipment. It also establishes requirements for equipment listing and labeling, mechanical execution of work, conductor terminations, electrical connections, equipment ratings, working clearances, dedicated equipment space, guarding of live parts, arc-flash warning labels, disconnect identification, and many other installation practices that promote safety and reliability.

Whether you're wiring a residential home, commercial building, or industrial facility, the rules found in Article 110 serve as the baseline requirements that support the rest of the NEC. A solid understanding of this article is essential for passing inspections, preventing installation errors, and building safe electrical systems.

On this page, you'll find explanations, study notes, practical examples, and references designed to help you understand Article 110 and apply it confidently in the field. This content is intended as an educational resource and should always be used alongside the currently adopted edition of the National Electrical Code and any applicable local amendments.