Yes, both ladder-type and trough-type cable trays can be used, depending on cable type, load, and installation requirements.

Ladder-Type Cable Trays

Ladder-type trays consist of two longitudinal side rails connected by transverse rungs, resembling a ladder. This open design allows excellent ventilation, which helps dissipate heat generated by power cables, making them ideal for large power cables and long horizontal runs in industrial or utility-scale installations . The rungs also provide convenient anchor points for securing single conductor cables, preventing displacement under fault conditions . Ladder trays are commonly used in petrochemical plants, refineries, and thermal power stations due to their high load capacity and ability to support heavy cables over long spans .

Trough-Type (Perforated) Cable Trays

Trough-type trays, also called perforated or ventilated trough trays, feature a solid bottom with regularly spaced ventilation holes and continuous side rails. This design provides continuous support for cables, reducing mechanical stress on small-diameter control, instrumentation, and communication cables, while still allowing some airflow . Trough trays are particularly suitable for mixed cable systems and indoor installations such as commercial buildings, control rooms, and industrial panels. They offer a balance between the strength of ladder trays and the protection of solid-bottom trays, preventing buckling or sagging of cables .

Compliance and Selection

According to NEC guidelines, single conductor cables and Type MV cables must be installed in ladder or ventilated trough trays, and solid-bottom trays are not permitted for these cable types . Ladder trays are the predominant choice, used in about 75% of installations, due to their superior ventilation, load capacity, and ease of cable management . Trough-type trays are often selected when continuous cable support is needed without compromising airflow.

Summary

• Ladder trays: Best for heavy power cables, long spans, and high ventilation needs.
• Trough trays: Best for mixed or small-diameter cables requiring continuous support and moderate ventilation.
• Both types are widely used and code-compliant when selected according to cable type, load, and environmental conditions . Choosing between ladder and trough trays depends on cable characteristics, installation environment, and thermal management requirements, ensuring safe, efficient, and maintainable cable routing.