What does Article 90 in the NEC focus on?

Article 90 in the National Electrical Code (NEC) serves as the introduction to the entire code. This section provides fundamental principles and general requirements that govern the application of the NEC. It outlines the purpose of the code, stipulating that it aims to ensure a safe electrical installation for people and property, and emphasizes the importance of compliance to promote electrical safety.

The introduction also defines the scope of the code, which includes not just wiring methods but every aspect of electrical systems and installations. It sets the context for the comprehensive regulations that follow throughout the NEC, acting as a foundation for understanding the detailed articles.

While the other options refer to specific subjects or applications that may be addressed elsewhere in the NEC, only the introduction, as defined in Article 90, provides the overarching guidance and objectives that apply to the entire code.