When builders install electrical cable systems and grease and ventilation duct assemblies, they must ensure that these systems comply with code-prescribed safety standards. Fire-resistive wrapping systems provide hourly fire-resistive ratings ensuring that cables and duct systems will remain functional during fire exposure and prevent fire from spreading.
For electrical cables with fire-resistant jacketing, UL tests their functionality during exposure to fire by applying voltage and current to the cable and monitoring their electrical and visual performance. When cable jacketing is not designed to provide fire resistance, cables are placed within a fire-resistive barrier or installed within an hourly rated fire-resistive assembly.
For grease duct enclosure assemblies, UL experts evaluate their ability to contain an internal fire or repel an external fire during predetermined test exposures according to standard requirements.
UL ratings help builders specify cables and duct assemblies that comply with rigorous fire safety standards.