Fiberglass cable trays ladder type

Fiberglass ladder-type cable trays are lightweight, corrosion-resistant, fire-retardant systems designed for industrial, marine, and chemical applications, with specifications governed by material composition, structural design, and international standards.

Material Composition

Fiberglass ladder trays are made from fiber-reinforced plastic (FRP), typically using pultruded, compression molded, or resin transfer molded processes. The glass fiber content ranges from 45–65% by weight in pultruded components and 25–45% in molded components, with flat sheets at 35–45% glass fiber. All materials include UV inhibitors to prevent degradation and are fire retardant, achieving a Class 1 flame spread rating (≤25) per ASTM E-84.

Conductive resin systems may include carbon additives to dissipate static electricity, meeting ABS rules for marine applications.

Structural Design

The ladder-type design consists of two longitudinal side rails connected by transverse rungs, forming a ventilated ladder structure. This design provides excellent heat dissipation and allows multiple cables to be supported. Common widths include 150mm, 300mm, and 450mm, with depths ranging from 2” (51mm) to 9” (229mm).

Rungs are spaced to optimize cable support, and straight sections are prefabricated for easy installation.

Load and Span Ratings

Load ratings are determined according to IEC 61537, with Safe Working Load (SWL) published in tables or diagrams. Maximum deflection is measured at the midpoint of a single span, and continuous spans may allow higher load ratings. Fiberglass trays are lightweight yet robust, offering a high strength-to-weight ratio suitable for demanding industrial environments.

Resin Systems and Environmental Resistance

Polyester resin: Standard, good UV and weather resistanceVinylester resin: Superior corrosion and heat resistanceEpoxy resin: Excellent electrical insulationPhenolic resin: Low smoke and toxicity, ideal for fire-sensitive areas FRP trays are non-conductive, non-magnetic, and highly resistant to corrosion and chemicals, making them suitable for chemical plants, offshore platforms, oil refineries, and water treatment facilities.

Installation and Accessories

Fiberglass ladder trays can be installed vertically or horizontally, with fittings of mitered construction and 12” radius. Covers are available for additional protection, including flat or peaked designs to shed snow or debris. Proper storage is recommended: indoors in dry, ventilated areas, or elevated and covered outdoors to prevent UV and moisture damage.

Standards and Compliance

Fiberglass ladder trays comply with: IEC 61537 for cable tray systemsABS Rules for marine and offshore applicationsASTM E-84 for flame spreadNEMA and other international standards for industrial installations. These specifications make fiberglass ladder-type cable trays a durable, versatile, and safe solution for managing electrical cables in harsh and corrosive environments.