For 4/0 and larger wire, what is used to determine the minimum cable tray width?

The minimum cable tray width for 4/0 and larger wire is determined by the diameter of the wire. This consideration ensures that the wires fit comfortably within the tray without crowding, which can help prevent issues such as overheating or damage to the insulation. Adequate spacing is crucial for both safety and performance, allowing for proper airflow and reducing the risk of electromagnetic interference.

Choosing the diameter as the basis for determining the tray width is particularly important for larger cables, as their increased size necessitates greater attention to spacing to comply with electrical codes and standards. The width of the tray must accommodate not only the diameter of the wires but also any necessary clearance for handling, maintenance, and potential expansion in the future.

Factors like height, length, and thickness may relate to other aspects of cable management or installation, but they do not directly affect the determination of tray width in the context of large wiring. Hence, focusing on diameter is the appropriate approach in this scenario.