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Flame retardant rating of metal cable trays

Metal cable trays can achieve high flame retardant ratings, such as E90, indicating up to 90 minutes of fire resistance under standardized testing conditions.Fire Resistance and Flame Retardancy

Metal cable trays, particularly steel trays, are often used in environments requiring high fire protection. Flame-retardant or fire-resistant cable trays are designed to prevent the spread of fire, smoke, and toxic gases, and to maintain circuit integrity during a fire . Aluminum alloy trays are generally not recommended in high fire-risk areas due to lower fire resistance .

E90 Fire Rating

The E90 fire rating is a widely recognized benchmark for cable containment systems. It is based on DIN 4102-12 testing, which evaluates the ability of cable trays to maintain circuit integrity under fire conditions. E90-rated trays are tested at 1,000°C for 90 minutes, and some products, like Armorduct trays, have been tested up to 120 minutes without collapse . This rating ensures that the tray can support cables safely during a fire, preventing structural failure and maintaining electrical continuity.

Material and Performance Considerations
  • Steel trays: Standard steel trays can be enhanced with fire-resistant coatings or enclosed with boards and nets to improve flame retardancy. Flame-retardant steel trays are typically 30% heavier and cost about 2.2 times more than standard steel trays, but they offer a service life more than five times longer .
  • Fire-proof trays: Slightly more expensive than steel, with a service life over three times longer, and similar weight to standard steel trays .
  • Testing parameters: Fire resistance testing evaluates flammability, smoke production, toxic gas emissions, and flame spread. Longer resistance times indicate better fire protection .
Standards and Compliance

While there is no dedicated global standard exclusively for cable tray fire resistance, DIN 4102-12 is commonly used in Europe. Other standards may include BS EN and national codes that define fire performance for light, medium, and heavy-duty trays . Compliance ensures that cable trays do not become fire hazards and maintain safety in critical installations.

Summary

For high fire safety requirements, steel cable trays with flame-retardant or fire-resistant coatings are preferred. The E90 rating is a key indicator of performance, providing up to 90 minutes of fire resistance, with some products exceeding this duration. Proper selection should consider material, weight, cost, and compliance with national fire codes to ensure both safety and longevity .

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