Industrial Power Plant: Requires heavy-duty trays, 2. 5–3 mm thick with widths up to 1000 mm, capable of holding multiple layers of power cables. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require additional protec eferred to support and protect numerous small. us-trations without notice. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. 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. From an engineering standpoint, cable tray dimensions are not. Ladder cable tray is available in widths of 6, 9, 12, 18, 24, 30, 36, 42 and 48 inches with rung spacings of 6, 9, 12 or 18 inches. Example #1 is based on the requirements in Sections 318-10(a)(2) and Section 318-11(b)(2). Section 318-10(a)(2) states that the sum of the cross-sectional areas of the single conductor cables shall not exceed. However, selecting the correct thickness and width of a cable tray is essential to maximize performance, avoid safety hazards, and minimize costs. This article explains the key considerations to help you make the right choice. The thickness and width of a cable tray directly impact its load-bearing.