What type of cable is used for fiberglass cable trays

Fiberglass cable trays typically use UL-listed, tray-rated cables such as Type TC (Tray Cable) for power and control, and Type ITC (Instrumentation Tray Cable) for instrumentation and communication circuits.

Overview of Fiberglass Cable Trays

Fiberglass cable trays, also known as FRP (Fiberglass Reinforced Plastic) trays, are made from fiber-reinforced polyester or vinyl ester resin, offering high corrosion resistance, lightweight construction, and long service life compared to steel trays. They are commonly used in industrial, marine, and harsh environments where chemical resistance and electrical insulation are important. Tray designs include ladder, trough, and channel types, each providing different levels of ventilation, protection, and support for cables.

Suitable Cable Types

Type T

C (Tray Cable)Used for power and control circuits in industrial settings. Composed of two or more insulated conductors, with or without grounding conductors, under a non-metallic jacket. Rated for 600 volts and can be installed in cable trays, raceways, or outdoor locations with proper support.

T

C cables may be flame retardant and UL-listed for hazardous locations, and Type TC-ER (Exposure Rated) allows short unsupported runs outside the tray.

Type IT

C (Instrumentation Tray Cable)Designed for instrumentation, control, and communication circuits. Available in shielded or unshielded constructions, with multiple conductors or twisted pairs, sometimes with metal armor. Provides protection against electrical interference and is suitable for sensitive signal transmission.

Installation Considerations

All cables used in fiberglass trays should be UL-listed and marked as cable tray rated. Proper support, securing, and spacing must be maintained according to NEC Section 392. 10 and manufacturer specifications.

Ladder-type trays are ideal for large-diameter power cables due to ventilation, while trough or channel trays are better for sensitive control or communication cables requiring additional protection. Stainless steel banding or other securing methods may be used in marine or vertical installations to meet safety standards.

Summary

For fiberglass cable trays, Type TC cables are preferred for power and control applications, while Type ITC cables are used for instrumentation and communication circuits. Both types must be UL-listed, tray-rated, and installed according to NEC and manufacturer guidelines to ensure safety, performance, and longevity in corrosive or harsh environments.