The primary rulebook used in the safe use of cable trays is NEC Article 392. This is a description of how to select, install, and support these metal or plastic frames, on which electrical wires are installed. With our many years of experience, we are one of the leading manufacturers in this field. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. association representing the major electrical equipment manufac-turers in the U. Our cable trays are manufactured from robust materials and rigorously tested to ensure they can withstand even the most demanding environments.