The thickness of the steel is typically calculated in millimeters (mm). The tray is very strong with 2. In the case of lighter data cables, 1. In practice, cable tray dimensions are a system of interrelated measurements —width, depth, length, and material thickness—that directly affect cable fill compliance, heat dissipation, structural loading, and long-term expandability. It also demonstrates how Eaton's solutions and services can help: As an industry leader in cable tray, Eaton offers one of the widest ranges of. ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. Thickness varies by material and load capacity: Galvanized cable tray thickness must meet ASTM A653 standards for corrosion resistance. NEC cable tray sizing follows Article 392, which specifies: IEC cable tray sizes (IEC 61537) provide European standards for: Load capacity increases with tray. In this guide, you will learn how to calculate cable tray size step by step using a practical formula, tray selection rules, and a real example.