Cable tray size calculation is important for ensuring safe cable installation, proper heat dissipation, and enough spare capacity for future expansion. In this guide, you will learn how to calculate cable tray size step by step using a practical formula, tray selection. We offer complete kits to provide you with cable tray ready to install under new or existing raised floors based on the unique requirements at your facility. Select Fill Standard: Choose 40% for power cables (NEC compliant) or 50% for. Getting cable tray pricing can feel tricky, right? Are you worried about overpaying or getting a quote that doesn't quite fit your project? Whether you're planning a big new build, renovating an existing space, or designing something really specific, understanding how to get precise and timely. Cable tray are used in wiring of buildings to support electrical cables and wires that are used to distribute power, controls and communication. The cable tray are for hot dip galvanized ladder type cable tray. The price is based on standard length of the cable tray which is 2. For the. With non-slip treaded covers to optimize slip resistance, the BKRS Walkable Cable Tray ensures your cables get the best defense.