Choosing the right cable tray system is critical for maximizing efficiency in industrial and photovoltaic cable management. 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. These are common questions when dealing with cable tray structures. But old ways of building them can cause issues. They can be heavy, hard to. Cable trays are normally classified by duty rating, which defines their load-bearing capability. Light Duty is Designed for small cable loads such as data cables and light power circuits. Common in offices and retail spaces. Medium Duty is Suitable for mixed power and data cabling in commercial. Is your cable tray system optimized for safety, dependability, space and cost savings? 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. This guide demonstrates the way of balancing between cost and strength and growth in the future so that each project can remain safe, reliable, and simple to maintain. 1 Would I put a Ladder or a Perforated Tray? 6.