Which article gives definitions used throughout the NEC?

Article 100 of the National Electrical Code (NEC) is dedicated to providing definitions for terminology used throughout the code. This article serves as a reference point that clarifies the meanings of specific terms, which is essential for proper interpretation and application of the NEC. Understanding these definitions helps ensure compliance with electrical standards and promotes safety within electrical installations.

By having a centralized source of definitions, Article 100 aids electricians, engineers, and inspectors in avoiding misunderstandings that could arise from ambiguous language. This consistency is crucial in the electrical industry, where precise communication affects safety and reliability.

In contrast, the other articles mentioned focus on specific areas: Article 110 outlines general requirements for electrical installations; Article 450 addresses the specifics for transformers and transformer vaults; and Article 517 deals with health care facilities. Each of these articles serves important functions but does not provide the comprehensive definitions that support the code as a whole like Article 100 does.