A vertical inside bend is a fitting used to change the direction of a cable tray system vertically, typically at a 90-degree angle, directing cables inward. This component is essential for installations where cables need to transition vertically while maintaining proper organization. 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. This Ladder Rack Curved Kit (cULus Classified) Inside, LIB12BLK item fits 12. with a material of Steel colored Black. 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. This guide draws from industry best practices, relevant standards like the NEC, and hands-on experience to provide you. This model is a vertical 90 degree down-turn bend transition tray. Standard depth is 4" with optional depth of 6". Model numbers are 12CTD90 (12" wide), 18CTD90. Running the trays on edge requires that you secure every cable to every rung of the tray. In my limited experience, the biggest added risk is the greater opportunity for a baboon installer to overtighten a ty-rap, cutting through the cable insulation. or, worse, not quite cutting through it.