Under the NEC, what aspect does Article 396 cover?

Article 396 of the National Electrical Code (NEC) specifically addresses messenger-supported wiring. This type of wiring system typically involves conductors that are suspended from a messenger wire, which serves as a support mechanism. This setup is often utilized for overhead power distribution or in some outdoor installations where traditional conduit or cable management systems may not be practical or feasible.

Messenger-supported wiring is essential in various applications where flexibility and easy installation are required, particularly in outdoor settings or applications involving temporary wiring solutions. When adhering to Article 396, it is crucial to ensure that all installations meet safety standards regarding load capacity, environmental considerations, and secure mounting practices.

The other topics listed, such as open wiring on insulators, cable trays, and underfloor raceways, are covered under different articles in the NEC. Each of these articles focuses on specific types of wiring methods and installation guidelines, highlighting the importance of situational adherence to the NEC for electrical safety and functionality.