The function is to provide a continuous, supported pathway that prevents cables from lying loose and vulnerable to physical damage. The system includes straight sections, fittings, and support hardware. The main types of accessories are categorized by their function: Fittings change the path or size of the run, including Elbows (for horizontal or vertical direction changes), Tees and Crosses (for multi-directional junctions), and Reducers (to transition between different tray widths). Support. A cable tray layout is a crucial aspect of electrical system design that dictates how cables are managed, organized, and protected within a facility or building. This article provides an in-depth explanation of cable tray layout and section design, covering its importance in detailed engineering. Q1: What is the primary purpose of cable tray sizing and calculation? Ensure the total cable area does not exceed the maximum fill area permitted by electrical codes (e. Prevent cable damage during installation and maintenance due to overcrowding. Provide adequate air circulation. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray.