How thick are the fireproof cable trays in Vanuatu in meters

Fireproof cable trays typically have a thickness ranging from 0. 024 to 0. 075 meters (24–75 mm) depending on fireproofing requirements and materials used.

General Thickness Guidelines

Fireproof cable trays are designed to maintain cable functionality during fires and are often wrapped or lined with fire-resistant materials such as mineral wool, fire-rated blankets, or firestop packs. According to industry standards: Firestop packs and wraps around cable trays are generally at least 24 mm thick, with some installations requiring up to 75 mm thickness for enhanced fire resistance. Aluminium or steel banding is used to secure the fireproof wrap, ensuring the tray maintains structural integrity during a fire.

Additional weather or mechanical protection may be added using corrugated aluminium sheeting, typically 0. 6 mm thick, but this does not significantly affect the fireproofing thickness.

Installation Considerations

The thickness of the fireproof layer depends on the number and weight of cables, as well as the required fire-resistance duration (commonly 30 minutes for hydrocarbon fires in industrial settings),. Fireproofing must cover all tray surfaces, including elbows and junctions, with overlaps of 50–75 mm to ensure continuous protection. For slab penetrations, a fire-support plate may be installed, and the fireproofing layer should be 20–30 mm thick at these points.

Practical Implications

While Vanuatu may follow international standards such as ASTM E1725-95 or API 2218 for fireproofing in industrial installations, the exact tray thickness should be verified with local building codes or project specifications. In practice, a fireproof layer of 24–75 mm is typical for cable trays carrying control or power cables in industrial and commercial projects. This range ensures that the cable trays can withstand fire exposure long enough to allow safe shutdown and evacuation, while maintaining mechanical stability and compliance with fire safety standards.