What article of the National Electrical Code (NEC) covers cable trays?

The article of the National Electrical Code (NEC) that addresses cable trays is indeed Article 392. Cable trays are structures designed to support insulated electrical conductors and cables, which can be either exposed or in conduit. Article 392 provides guidelines on the installation, use, and construction of cable trays, reflecting the specific requirements and safety considerations associated with them.

This article covers important aspects such as the types of cable trays, load factors, support spacing, and material requirements, ensuring that installations are compliant with the necessary safety and performance standards. By focusing specifically on cable trays, Article 392 ensures that the electrical system is both functional and safe in its operation.

The other articles mentioned deal with different aspects of electrical installations: Article 310 relates to conductors, their ampacity, and installation considerations; Article 400 pertains to flexible cords and cables; while Article 450 deals with transformers and their installations. Each of these articles has a distinct focus and requirements that do not apply to cable trays directly.