What is the primary subject of NEC Article 400?

The primary subject of NEC Article 400 is flexible cords and cables. This article outlines the requirements for the use, installation, and construction of flexible cords and cables, which are crucial in various electrical applications. Flexible cords are typically used for temporary connections, allowing for the flexibility necessary in dynamic or portable equipment settings.

NEC Article 400 details safety measures, voltage ratings, and the appropriate applications of different types of flexible cords. Understanding these regulations helps electricians ensure that installations are compliant with safety standards, preventing potential hazards related to flexible wiring connections. The emphasis on the construction specifications and permissible uses aids professionals in selecting the right type of flexible cord for a particular job, ensuring both functionality and safety.