Customization can include adjustments in size, shape, material, and additional features such as covers, dividers, or fireproof coatings. For example, a data center may require perforated trays for better ventilation, while an industrial plant might need reinforced trays to. association representing the major electrical equipment manufac-turers in the U. The Cable Tray ng standards, performance standards, test standards and application in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or. The International Electrotechnical Commission (IEC) provides detailed guidelines for cable tray systems under IEC 61537. This standard outlines the construction requirements, testing methods, and performance parameters for cable trays and related support systems. Whether you're designing a new. Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and industrial applications. It is the first joint effort of NEMA and CSA International to put in one place standards for metal trays per both NEMA and CSA methods.