A minimum clearance of 23 cm (9 in) should be maintained between the top of a tray and beams, piping, etc., to facilitate installation of cables in the tray. In general, vertical spacing for cable trays should be 30 cm (12 in), measured from the bottom of the upper tray to. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. One of the most recognized frameworks globally is the IEC standard for. 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. 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. When offloading tray from a flat deck trailer using an overhead crane, care should be exercised in the placement and length of the slings to prevent crushing the product (siderails). Only. This guide covers the critical steps, from selecting the right electrical cable tray and performing accurate cable fill calculations to managing a safe cable pull through and ensuring all bonding and grounding requirements are met. For licensed electricians, mastering these principles is essential. Although BS 7671 touches on the subject of cable supports, it does not detail specifically what these support distances should be. 8 (Other Mechanical Stresses (AJ)) in that document provides requirements for cable support.