This step‑by‑step approach helps you determine width, depth, support spacing, and allowable load with confidence. Plan 20–30% spare capacity for growth. Remember separation rules for EMI and. The purpose of this AE Note is to outline the use of fiber optic cables in “tray rated” environments. While there are several specific types of listings for power cables, specifically for tray. 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. These installations require careful planning to protect signal integrity and ensure long-term reliability. You don't need a PhD—just a consistent method.