System and method for suppressing fire in electrical boxes

• US 6,252,167 B1
• Filed: 02/03/1999
• Issued: 06/26/2001
• Est. Priority Date: 02/03/1999
• Status: Expired due to Term

• Current Assignee: RectorSeal, LLC (CSW Industrials, Inc.), Fireblok Ip Holdings, LLC
• Original Assignee: Elmer Algin Rose
• Inventors: Rose, Elmer Algin
• Primary Examiner(s): REICHARD, DEAN ALAN
• Application Number:
  US09/243,898
• Time in Patent Office: 874 Days
• Field of Search: 174/50, 174/66, 220/3.2, 220/241, 220/3.8, 522/32
• US Class Current: 174/66
• CPC Class Codes: H02G 3/0412 Heat or fire protective means for fire in electric circuits A62C3/16
• CPC Class Codes: H02G 3/088 Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets

Abstract

A method for suppressing electrical fires provides an electrical box which defines an opening for access to the electrical box. The electrical box includes therein either an electrical device or an electrical cable. A support is sized to cover a majority of the opening. An intumescent material is applied to the support. The support is mounted adjacent to the opening so that the support covers a majority of the opening. The intumescent material expands in response to heat generated within the electrical box to suppress a fire within the electrical box.

Claims

1. A system for suppressing electrical fires, comprising:

(a) an electrical box defining an opening for access therein and including therein at least one of an electrical device and an electrical cable;

(b) a support sized to cover a majority of said opening;

(c) an intumescent material applied to said support, said intumescent material being capable of expanding by at least 200% when exposed to a temperature in excess of 400°

F.; and

(d) said support mounted adjacent to said opening so that said intumescent material covers at least a majority of said opening.

2. The system of claim 1 wherein said intumescent material is present in a sufficient amount so as to fill a major portion of said electrical box when fully activated.

3. The system of claim 1 wherein said intumescent material expands by at least 700% when exposed to a temperature in excess of 400°

F.

4. The system of claim 1, further comprising a cover plate attached to said electrical box.

5. The system of claim 1, further comprising an adhesive applied to said support.

6. The system of claim 5 wherein said adhesive adheres said support to a cover plate.

7. The system of claim 1 wherein said support covers substantially all of said opening.

8. The system of claim 1 wherein said support is a gasket.

9. The system of claim 1 wherein said support is a cover plate.

10. A method for suppressing fires in an electrical box, comprising:

(a) providing an electrical box, said electrical box defining an opening for access therein and containing at least one of an electrical device and an electrical cable;

(b) providing a support sized to cover a majority of said opening;

(c) applying an intumescent material to said support, said intumescent material being capable of expanding by at least 200% when exposed to a temperature in excess of 400°

F.;

(d) mounting said support adjacent to said opening so that said support covers a majority of said opening; and

(e) expanding said intumescent material in response to heat generated within said electrical box.

11. The method of claim 10 wherein said intumescent material is present in a sufficient amount so as to fill a major portion of said electrical box when fully activated.

12. The method of claim 10 wherein said support is a gasket.

13. The method of claim 10 wherein said support is a cover plate.

14. The method of claim 10, further comprising the step of attaching a cover plate to said electrical box.

15. The method of claim 10, further comprising the step of applying an adhesive to at least one side of said support.

16. The method of claim 15, further comprising the step of attaching said support to a cover plate with said adhesive and attaching said cover plate to said electrical box.

17. A system for suppressing electrical fires, comprising:

(a) an electrical box defining an opening for access therein and including therein at least one of an electrical device and an electrical cable; and

(b) a layer of intumescent material mounted adjacent to said opening so that said layer of intumescent material covers a substantial portion of said opening, said intumescent material being capable of expanding by at least 200% when exposed to a temperature in excess of 400°

F.

18. The system of claim 17 wherein said layer of intumescent material is molded to form a cover plate.

19. The system of claim 17 wherein said intumescent material is present in a sufficient amount so as to fill a major portion of said electrical box when fully activated.

20. The system of claim 17 wherein said electrical box includes at least one of a light switch and an outlet plug.

21. A system for suppressing an electrical fire, comprising:

(a) an electrical box defining an opening for access therein and including therein at least one of an electrical device and an electrical cable;

(b) a removable cover plate attached to said electrical box for closing said opening; and

(c) said electrical box containing therein an intumescent material, said intumescent material being capable of expanding by at least 200% when exposed to a temperature in excess of 400°

F.

22. The system of claim 21 wherein said intumescent material is in the form of a layer attached to an interior surface of said electrical box.

23. The system of claim 21 wherein said layer of intumescent material is attached to said at least one of said electrical device and said electrical cable with an adhesive.

24. The system of claim 21 wherein said layer of intumescent material is applied to a support mounted adjacent to said opening.

25. The system of claim 21 wherein said intumescent material is in a form selected from the group consisting of a pill, a tablet and a packet.

26. The system of claim 21 wherein said intumescent material is present in a sufficient amount so as to fill a major portion of said electrical box when fully activated.