(i) Conductors entering cutout boxes, cabinets, or fittings shall be protected from abrasion, and openings through which conductors enter shall be effectively closed. Cable trays can provide a safe component of a power, low voltage control, data or telecommunications wiring distribution system. Cables in trays can be easy to mark, find, and remove. Their flexibility makes cable trays a good choice for installation situations that require upgrading. This article explains the main requirements and good practices for cable tray systems, including tray types, materials, loading, supports, bonding, cable selection, and installation details. The content is written to be SEO-friendly and compatible with Yoast SEO for WordPress. (ii) Unused openings in cabinets, boxes, and fittings shall be effectively. en completely installed, without damage either to conductors or structural system use 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. 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.