Provides technical requirements concerning the construction, testing, and performance of metal cable tray systems. Hubbell's NEXTFRAME® Ladder Tray is the effective and widely used cable runway that supports and delivers bundles of cable between cabinets, racks, and closets, along walls, and suspended from ceilings. The Ladder Tray features light, rugged, tubular steel construction. Eaton's submittal builder tool. 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 structural system use maintain spacing or to keep cables in place when the tray is ect the minimum. us-trations without notice. The basic styles of cable tray are: Ladder, Trough, Center Rail, Wire Basket and Channel. The splice retention groove holds the splice in place while maintaining structural integrity. NEMA class 12A and 12B, the.