This step‑by‑step approach helps you determine width, depth, support spacing, and allowable load with confidence. Group by power, control, and data. Plan 20–30% spare capacity for growth. Remember separation rules. How to Use the Shielden Cable Tray Load Calculator? Using our advanced cable tray load calculator is simple and ensures your electrical installation meets structural and safety standards. I'm here to tell you, it's simpler than you might think, and it makes a huge difference. es in the industrial environment. Live Load (Q): Temporary loads such as maintenance personnel, tools, and other equipment placed on the tray. You don't need a PhD—just a consistent method.