A cable tray specification should identify the complete system: rails, rungs or base, joints, fittings, covers and supports. Pultruded FRP can be useful in corrosive environments and where an insulating support is appropriate. Resin compatibility and documented system performance determine whether it fits the project.
For the differences between support constructions, international manufacturer examples and a material comparison, read our tray, trunking and ladder guide.
Start with the exposure and cable schedule
State the cable types, mass, arrangement, operating conditions and route geometry. Identify chemical exposure, cleaning agents and temperature before selecting a resin. Fiberline's chemical-resistance table demonstrates why an FRP material description without a resin grade is insufficient. Its data apply to its own grades, not every fiberglass tray.
Corrosion resistance does not mean immunity to every environment. Include exposed cuts, fasteners and support materials in the assessment. Installation and maintenance access belong in the decision alongside purchase price.
Structural information to request
Ask for allowable load and deflection at the intended support spacing, including temperature limitations and conditions for joints and end spans. Specify the support arrangement at bends and changes in level. A supplied straight-section length is not an allowable unsupported span.
The Øglænd FOE data illustrate how load capacity changes with support spacing and system configuration. These published competitor values are examples of documentation to request, not F1 ratings.
Use standards within their scope
IEC 61537:2023 covers cable tray and ladder systems and excludes trunking and ducting. UL 568 addresses nonmetallic cable tray systems. Verify certification claims for the actual offered product.
NEMA VE 1 concerns metal cable trays. The legacy fiberglass standard NEMA FG 1 was rescinded in November 2017, according to the Cable Tray Institute. A historic load class does not automatically establish acceptance under the project's current requirements.
ASTM E84 measures surface-burning characteristics. A result under that method does not establish circuit survival or load-bearing performance in a fire. Ask separately for the fire, smoke and other evidence required by the project.
Electrical and installation considerations
Ordinary glass FRP is insulating and cannot be used as a protective conductor. It does not supply conductive shielding for sensitive circuits. Protective conductors, bonding of exposed metal parts, cable separation and shield termination remain part of the electrical design. See Eaton's cable tray manual for background; its historical code commentary is not a substitute for the current locally adopted rules.
Field cutting and drilling require appropriate tools, dust controls and cut-edge sealing. Follow the offered system's installation instructions rather than assuming that every joint or support detail matches steel. Enduro's installation guide describes these practical requirements.
Prepare an RFQ that can be checked
Send the route drawing, cable schedule, support spacing, exposure, temperature and required acceptance evidence. Identify cover, fitting and accessory requirements so quotations cover the same scope. Discuss FRP cable tray supports with F1 Composite and confirm the offered system and supporting documentation before procurement.
