Fire cable tray GB standard

Fire-resistant cable trays are designed to maintain circuit integrity during fire, and while China's GB standards exist for fire safety, DIN 4102-12 and E90 ratings are commonly referenced internationally for testing and compliance.

Fire Resistance and Ratings

Fire-resistant cable trays are engineered to support cables during fire events, ensuring that circuits remain operational for critical systems. Internationally, the DIN 4102-12 standard is widely used to test cable trays, requiring the system to withstand temperatures up to 1000°C for 30, 60, and 90 minutes, with some products tested up to 120 minutes achieving an E90 rating . These tests simulate real fire conditions and assess the tray's ability to maintain structural integrity and support cables without collapse. In China, GB standards such as GB 50016 (Code for Fire Protection Design of Buildings) and GB 50217 (Code for Design of Electrical Installations in Buildings) provide fire safety requirements for cable systems, including fire-resistant cables and containment. While a dedicated GB standard for cable tray fire resistance may not be explicitly defined, compliance is typically achieved by using fire-rated cables (e.g., FP600) and fireproof trays that meet equivalent international test criteria.

Materials and Tray Selection

Cable trays must be selected based on environmental conditions and load requirements:

• Indoor: Painted steel or galvanized steel trays
• Outdoor: Hot-dip galvanized or stainless steel trays
• Corrosive or high-humidity environments: Aluminum alloy or fiberglass-reinforced plastic trays Tray width and thickness should accommodate the number and weight of cables, ensuring mechanical strength to prevent deformation under full load.

Installation and Fireproofing Measures

Proper installation is critical for fire safety:

• Segregation: Power and signal cables should be routed separately to reduce interference and fire risk .
• Separation for life-safety circuits: A horizontal air gap of ≥300 mm between primary and secondary life-safety trays is recommended, or alternatively, fire-rated barriers can be used .
• Fireproof accessories: Intumescent collars, firestop wraps, and cable cleats help maintain fire integrity at penetrations and support points .

Practical Considerations

• Fire-resistant trays are commonly used in industrial, power, oil, gas, petrochemical, rail, and utility sectors .
• Using fire-rated cables in combination with fireproof trays ensures compliance with GB fire safety codes.
• When GB-specific fire ratings are not available, referencing DIN 4102-12 or E90-rated products provides a defensible approach for design and regulatory approval . By selecting appropriate materials, maintaining proper separation, and using fireproof accessories, cable tray systems can meet both GB fire safety requirements and international best practices for fire resistance.