When installing larger cables in a cable tray, what must the tray width meet?

The correct choice emphasizes that the width of the cable tray must accommodate the sum of the cross-sectional areas of the cables being installed. This ensures that there is enough space for the cables without overcrowding, which can lead to issues such as overheating, physical damage to the cables, or impediments to maintenance or installation procedures.

When calculating the requirements for a cable tray, it is essential to consider the physical dimensions of the cables, including their diameter and the total area they occupy. This is crucial not only for effective cable management but also for compliance with safety regulations and standards that dictate how electrical installations should be conducted.

Understanding the necessity of matching the tray width to the sum of the cable cross-sectional areas helps maintain efficient airflow around the cables, reducing the risk of heat buildup, and facilitating the overall durability and reliability of the electrical installation. Other considerations like safety standards and manufacturer's specifications play supportive roles but do not directly address the specific requirement concerning the tray width in relation to the cables installed.