A fire proof cable tray constructed of assemblable units, each of which comprises a metal frame having a wire mesh covering attached thereto, an intumescent coating encapsulating the wire mesh, a layer of an inorganic, non-combustible fiber mat and a sheet of metal foil. The foil, fiber mat and encapsulated...http://www.google.fr/patents/US4276332?utm_source=gb-gplus-shareBrevet US4276332 - Fire proof cable tray enclosure
