This guide explains what EI ratings mean in practice and how to specify them correctly. For the full selection matrix including environment and procurement, see the fire resistant cable tray selection guide. This buying guide breaks down the three factors that matter most to overseas buyers: load capacity, fire rating, and cost, and explains how to balance them without over- or under-specifying your system. Understanding Load Capacity: More Than Just Cable Weight Load capacity is often the first. EI60, EI90, and EI120 are widely used fire resistance targets in cable tray specifications, yet they are often applied without a clear link to project risk, tested configurations, and lifecycle implications. Typical Standards: Product. UL 1257: Ensuring Fire-Resistant Cable Tray and Conduit Assemblies for Safe and Compliant Industrial Operations The fire-resistant cable tray and conduit assemblies play a critical role in maintaining safe and compliant industrial operations, particularly within hazardous locations such as chemical.
[PDF Version]