What does Article 90 in the NEC involve?

Article 90 in the National Electrical Code (NEC) serves as the introduction to the code itself. It outlines the purpose, scope, and application of the NEC, providing essential definitions and explaining the code’s intent in ensuring safety and standardization in electrical installations. This introduction is crucial for understanding how the subsequent articles and requirements should be applied to electrical work.

The content of Article 90 addresses why the code exists, the fundamental principles it adheres to, and how it should be used by those involved in electrical design and installation. It sets the foundation for the rest of the code, allowing users to comprehend the framework within which electrical work must operate.

The other options address specific subjects or features that are covered in later articles of the NEC, but Article 90 is distinct in its role as the key introductory component that establishes the framework for all other regulations within the code.