Note: Width = outside to outside dimensions. Commonly called the Load Class, this defines the load-carrying capability of the tray for a specific support span distance. The design and cost of the cable tray is greatly affected by this designation. us-trations without notice. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. Tray cable is a multi-conductor or multi-pair power, control, or instrumentation cable approved for installation in cable trays without additional conduit. Cablofil adapts to the most complex configurations, and its structure gives maximum strength for minimum weight.