This guide covers the cable tray types and their appropriate applications, the fill rules for each configuration, ampacity derating requirements, separation of power and signal cables, and the decision criteria for choosing cable tray over conduit. 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. association representing the major electrical equipment manufac-turers in the U. Cable trays and pipes work together to manage the flow of electricity, fluids, and gases, with cable trays primarily supporting electrical cables, and pipes. Hubbell Wiring Device-Kellems and Hubbell Premise Wiring are divisions of Hubbell Incorporated, a U. headquartered manufacturer with over 130 years of supplying solutions for the electrical and data markets. Hubbell's strength is demonstrated by a long-standing reputation for supplying reliable. Which is the better practice in the event that piping must cross cable trays? Is it dependent upon the pipe joining method or insulation? If there's a chance of leakage I would think that routing the pipe under the cable trays would be better. ” Cable trays are not raceways, but they are treated as a structural component of a facility's electrical system.