Underfloor access housing utilizing a trough space of a cellular flooring unit
Composite preset block for underfloor wire distribution systems
Fitting for penetration through fire rated barriers
Heat recoverable article and methods using same
Cable support systems
Fire-resistant electrical wiring distributing floor structure and method
Fire barrier assembly for electrical cable
Electrical activating assembly and closure member therefor Patent #: 4289921
ApplicationNo. 06/131829 filed on 03/19/1980
US Classes:174/486, Under floor and flush mounted169/48, APPARATUS WHICH ISOLATES FLAMES FROM NON-BURNING AREA174/489, Terminals inside housing52/220.1WALL, CEILING, OR FLOOR DESIGNED FOR UTILITIES
ExaminersPrimary: Murtagh, John E.
Attorney, Agent or Firm
International ClassesH02G 3/08 (20060101)
H02G 3/18 (20060101)
AbstractApparatus for fireproofing an underfloor access chamber of an electrical wiring distributing floor structure. The access chamber is formed between a cellular unit and a covering layer of concrete. The access chamber has at least one inlet opening communicating with a raceway presented by the cellular unit; and an outlet opening providing access to the chamber from the space above the concrete. An unobtrusive strip of fire-resistant material, disposed within the chamber, covers substantially entirely all of the bottom portion and obstructs the inlet opening. The strip shields the upper portion of the chamber from heat transfer by convection and by radiation. Slit means formed in the strip allows passage of wiring without significantly deteriorating obstruction of the inlet opening.
Field of SearchIRREVERSIBLY REACTIVE COMPONENT