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The recommended width for a cable tray is generally determined based on industry practices and the specific needs of the installation. A width of 300mm (12 inches) provides a good balance between capacity and manageability in a variety of applications. This size allows for the installation of multiple cables while ensuring that there is sufficient space for airflow, maintenance, and future expansions.

Using a 12-inch width helps to reduce the risk of overcrowding while still accommodating a decent number of cables, preventing issues such as overheating and cable damage that can occur with tighter spaces. Additionally, 300mm is a common standard that aligns with the dimensions used in many commercial and industrial installations, providing uniformity and compatibility across different systems.

In contrast, widths that are too small may lead to accessibility and thermal management concerns, whereas excessively wide trays might be unnecessary for most applications, leading to wasted space and resources. Therefore, selecting 300mm as the standard width combines practicality with optimal performance in cable management systems.