Cable temperature is easy to ignore when a project is still on paper, but it becomes a real issue after many cables are laid together. When cables are packed in a closed space, heat is harder to release. Over time, this may affect the cable jacket, reduce power transmission stability, and make later inspection more difficult. A tray with holes, slots, or an open ladder structure gives the cable group more air contact. This simple design helps reduce heat build-up and also lets workers see the cable condition without opening every part of the route.
Ventilation does not mean the tray has no protection. In many rooms, a ventilated tray can still be used with a cover on top. The bottom and side holes keep airflow, while the cover helps block dust or small falling objects. This is useful in machine rooms, control rooms, and factory lines where cable paths may change later. The final design should balance cooling, cable safety, and cleaning needs. For this reason, engineers often check the cable current, laying density, room temperature, and maintenance method before deciding between solid, perforated, and ladder tray styles.