| 摘要 |
A wiring fitting of the type adapted to be supported in a floor opening in a floor of a building structure. The fitting includes at least one intumescent fire retarding member formed from a polymeric based intumescent material. Employing a polymeric intumescent material allows the intumescent members to be formed by molding or extruding processes. A relatively rigid intumescent material may be used to form components including a tubular insert sized for insertion into the floor opening, as well as other components that could otherwise be formed from plastic, such as the cover plate, the receptacle barrier, and the trim flange. A relatively flexible polymeric based intumescent material can be used to form seals in the fitting.
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