When cable trays pass through walls or floors, seal openings using fire-rated penetration sealing materials. Do not modify or damage the tray coating or structure during use. 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. Cable tray installation must comply with specific technical standards to ensure electrical safety, system reliability, and long-term maintainability. It was as if a different person planned and executed each and every hole — even in the same building, even on the same floor! There. Cable trays should not pass through a fire rated wall because the metal tray can conduct heat through the wall and may ignite materials on the other side.