Protective electrical wiring device and system

• US 7,713,084 B1
• Filed: 09/14/2006
• Issued: 05/11/2010
• Est. Priority Date: 10/07/2003
• Status: Expired due to Term

• Current Assignee: Pass And Seymour Incorporated (Legrand SA)
• Original Assignee: Pass And Seymour Incorporated (Legrand SA)
• Inventors: Weeks, Richard, Benoit, John
• Primary Examiner(s): TA, THO DAC
• Application Number:
  US11/531,812
• Time in Patent Office: 1,335 Days
• Field of Search: 439/535, 439/536, 439/650, 439/352, 439/694, 439/620.21, 439/620.22, 174/48, 174/66, 174/67, 174/50, 174/53, 174/58, 220/241
• US Class Current: 439/535
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H01R 13/6683 with built-in sensor
• CPC Class Codes: H01R 13/70 with built-in switch
• CPC Class Codes: H01R 25/003 the coupling part being secured only to wires or cables

Abstract

The present invention is directed to an electrical wiring system that includes a plug device having a plurality of wires configured to be connected to an electrical distribution circuit. An electrical wiring device includes an input receptacle and at least one electrical element. The input receptacle is configured to receive the plug device to thereby establish electrically a continuous path between the at least one electrical element and the plurality of wires when the plug device is inserted into the input receptacle, the electrical wiring device including no external terminal connection elements.

Claims

1. A protective wiring device comprising:

a housing including a front cover member having a user-accessible front major surface and a back cover member having a back major surface arranged substantially in parallel with the front major surface, the user-accessible front major surface including at least one set of plug blade apertures configured to accept a set of plug blades from a corded plug, the back cover member including a power input receptacle formed at a first housing end, the power input receptacle being configured to receive a power input plug configured to be coupled to a source of AC power;

a set of receptacle terminals disposed within the front cover member, the set of receptacle terminals including a set of receptacle contacts that are accessible via the at least one set of plug blade apertures;

a power input assembly including a set of power input contacts disposed in the back cover member within the power input receptacle, the set of power input contacts being configured to mate with the power input plug when the power input plug is inserted into the power input receptacle, the set of power input contacts being connected to a plurality of conductive paths, the plurality of conductive paths being coupled to the set of receptacle terminals in a reset state and decoupled from the set of receptacle terminals in a tripped state; and

a protective electrical circuit assembly including a toroidal sensor assembly coupled to the power input assembly, the protective electrical assembly further including a printed circuit board disposed adjacent the set of power input contacts in a plane substantially parallel to the back major surface, the printed circuit board including a fault detection circuit, a solenoid assembly, and at least a portion of a circuit interrupter mounted thereon, the set of power input contacts, the solenoid assembly and the toroidal sensor assembly being arranged within a plane disposed between the printed circuit board and the set of receptacle terminals.

2. The device of claim 1, further comprising a reset button assembly that includes a user accessible reset button disposed in the front cover and a reset mechanism coupled to the circuit interrupter, the reset button assembly being configured to effect the reset state in response to a user stimulus, the reset mechanism being disposed between the set of power input contacts, and the toroidal sensor assembly.

3. The device of claim 1, wherein the protective electrical circuit assembly includes an energy-efficient power supply that is configured to provide power to the protective electrical circuit assembly during all or a portion of a predetermined half cycle of a plurality of AC cycles.

4. The device of claim 1, further comprising a test button assembly disposed adjacent to a reset button assembly in the front cover, the test button being coupled to at least one test circuit coupled to the protective electrical circuit assembly.

5. The device of claim 1, wherein the protective wiring device includes no external terminal connection elements.

6. The device of claim 1, wherein the power input contacts are configured as blade structures.

7. The device of claim 1, wherein the protective electrical assembly further including a printed circuit board being substantially disposed between the set of power input contacts and the toroidal sensor assembly within the back cover member.

8. The device of claim 1, wherein the protective electrical circuit assembly is selected from a group of circuit assemblies that includes a GFCI, an AFCI, a transient voltage surge suppressor (TVSS), a sensor device, and/or an environmental regulation device.

9. The device of claim 1, wherein the circuit interrupter is configured to effect the tripped state in response to a fault detect signal provided by the fault detection circuit.

10. The device of claim 9, wherein the fault detect signal is indicative of a ground fault, an arc fault or a transient voltage surge.

11. The device of claim 1, wherein the housing further includes an electrically isolating separator member disposed between the front cover member and the back cover member such that a front interior region is formed between the front cover member and the electrically isolating separator member and a rear interior region is formed between the back cover member and the electrically isolating member.

12. The device of claim 11, further comprising a ground strap having an interior ground strap portion disposed on the electrically isolating member in the front interior region, the ground strap being connected to a ground blade of the set of power input contacts.

13. The device of claim 1, wherein the circuit interrupter includes a hot cantilevered circuit interrupter structure disposed on a first longitudinal side of the solenoid assembly and connected to a hot conductive path of the plurality of conductive paths, and wherein the circuit interrupter includes a neutral cantilevered circuit interrupter structure disposed on a second longitudinal side of the solenoid assembly and connected to a neutral conductive path of the plurality of conductive paths.

14. The device of claim 13, wherein the hot cantilevered circuit interrupter structure is coupled to the hot conductive path and the neutral cantilevered circuit interrupter structure is coupled to the neutral conductive path via the toroidal sensor assembly.

15. The device of claim 14, wherein the hot conductive path includes a hot wire conductor disposed between a hot blade of the set of power input contacts and the toroidal sensor assembly and the neutral conductive path includes a neutral wire conductor disposed between a neutral blade of the set of power input contacts and the toroidal sensor assembly.

16. The device of claim 1, further comprising an end-of-life circuit element configured to decouple the fault detection circuit from the plurality of conductive paths in response to an end-of-life condition.

17. The device of claim 16, wherein the end-of-life circuit element includes an auxiliary switch coupled between the solenoid assembly and the fault detection circuit.

18. The device of claim 1, wherein the protective electrical circuit assembly includes a light indication circuit.

19. The device of claim 18, wherein the light indication circuit includes at least one LED disposed on the printed circuit board and at least one light pipe disposed between the at least one LED and at least one aperture formed in the front cover member.

20. The device of claim 18, wherein the at least one set of plug blade apertures is disposed substantially adjacent to a lens element in the user-accessible front major surface opposite, the lens element being configured to cover a light emitting element connected to the light indication circuit.

21. The device of claim 20, further comprising a reset button and a test button substantially disposed adjacent the lens element.

22. The device of claim 20, wherein the user accessible front major surface is characterized by a longitudinal axis and a latitudinal axis, the lens element including a first dimension parallel to the latitudinal axis and a second dimension parallel to the longitudinal axis, and wherein the first dimension or the second dimension is disposed along an edge of the user accessible front major surface.

23. The device of claim 22, wherein the first dimension is substantially equal to a width of the user accessible front major surface.

24. A protective wiring device comprising:

a housing including a front cover member having a front major surface and a back cover member having a back major surface arranged substantially in parallel with the front major surface, the housing further including an electrically isolating separator member disposed between the front cover member and the back cover member such that a front interior region is formed between the front cover member and the electrically isolating separator member and a rear interior region is formed between the back cover member and the electrically isolating member, the front major surface including at least one set of plug blade apertures configured to accept a set of plug blades from a corded plug, the back cover member including a power input receptacle formed at a first housing end, the power input receptacle being configured to receive a power input plug configured to be coupled to a source of AC power such that the protective wiring device includes no external terminal connection elements;

a set of receptacle terminals disposed in the electrically isolating separator member within the first interior region, the set of receptacle terminals including a set of receptacle contacts that are accessible via the at least one set of plug blade apertures;

a power input assembly including a set of power input contacts disposed in the rear interior region within the power input receptacle, the set of power input contacts being configured to mate with the power input plug when the power input plug is inserted into the power input receptacle, the set of power input contacts being connected to a plurality of conductive paths, the plurality of conductive paths being coupled to the set of receptacle terminals in a reset state and decoupled from the set of receptacle terminals in a tripped state;

a protective electrical assembly substantially disposed in the rear interior region and coupled to the power input assembly, the protective electrical assembly including a toroidal sensor assembly, a fault detection circuit, a solenoid assembly, and a circuit interrupter, the toroidal sensor assembly and the solenoid assembly being disposed in the rear interior region portion at a second housing end opposite the first housing end, the circuit interrupter being configured to effect the tripped state in response to a fault detect signal provided by the fault detection circuit; and

a reset button assembly including a user accessible reset button disposed in the front cover and a reset mechanism coupled to the circuit interrupter, the reset button assembly being configured to effect the reset state in response to a user stimulus, the reset mechanism being disposed between the set of power input contacts, and the toroidal sensor assembly and the solenoid assembly.

25. The device of claim 24, further including a ground strap having an interior ground strap portion disposed on the electrically isolating member in the front interior region.

26. The device of claim 24, wherein the protective electrical circuit assembly is selected from a group of circuit assemblies that includes a GFCI, an AFCI, a transient voltage surge suppressor (TVSS), a sensor device, and/or an environmental regulation device.

27. The device of claim 24, wherein the circuit interrupter includes a hot cantilevered circuit interrupter structure disposed on a first longitudinal side of the solenoid assembly and connected to a hot conductive path of the plurality of conductive paths, and wherein the circuit interrupter includes a neutral cantilevered circuit interrupter structure disposed on a second longitudinal side of the solenoid assembly and connected to a neutral conductive path of the plurality of conductive paths.

28. The device of claim 27, wherein the hot cantilevered circuit interrupter structure is coupled to the hot conductive path and the neutral cantilevered circuit interrupter structure is coupled to the neutral conductive path via the toroidal sensor assembly.

29. The device of claim 28, wherein the hot conductive path includes a hot wire conductor disposed between a hot blade of the set of power input contacts and the toroidal sensor assembly and the hot neutral conductive path includes a neutral wire conductor disposed between a neutral blade of the set of power input contacts and the toroidal sensor assembly.

30. An electrical wiring system for use in an electrical distribution system including at least one electric circuit, the at least one electric circuit including a plurality of electric power transmitting wires disposed between an electric power distribution point and a device box disposed at an electrical device location, the device box having a wiring ingress aperture, an interior device box volume and an open side, the plurality of electric power transmitting wires being routed through the wiring ingress aperture and accessible at the open side after a rough-in phase of installation, the system comprising:

a power input plug assembly including a plurality of plug connector contacts disposed within a power input plug housing, the power input plug assembly including a termination interface configured to terminate the plurality of electrical power transmitting wires such that electrical continuity is established between the plurality of plug connector contacts and the electric power distribution point; and

a protective wiring device comprising,

a housing including a front cover member having a front major surface and a back cover member having a back major surface arranged substantially in parallel with the front major surface, the front major surface including at least one set of plug blade apertures configured to accept a set of plug blades from a corded plug, the back cover member including a power input receptacle formed at a first housing end, the power input receptacle being configured to receive the power input plug housing configured to be coupled to a source of AC power such that the protective wiring device includes no external terminal connection elements,

a set of receptacle terminals disposed within the front cover member, the set of receptacle terminals including a set of receptacle contacts that are accessible via the at least one set of plug blade apertures,

a power input assembly including a set of power input contacts disposed in the back cover member within the power input receptacle, the set of power input contacts being configured to be coupled to the plurality of plug connector contacts when the power input plug housing is inserted into the power input receptacle, the set of power input contacts being further connected to a plurality of conductive paths, the plurality of conductive paths being coupled to the set of receptacle terminals in a reset state and decoupled from the set of receptacle terminals in a tripped state, and

a protective electrical circuit assembly including a toroidal sensor assembly coupled to the power input assembly, the protective electrical assembly further including a printed circuit board disposed adjacent the set of power input contacts in a plane substantially parallel to the back major surface, the printed circuit board including a fault detection circuit, a solenoid assembly, and at least a portion of a circuit interrupter mounted thereon, the set of power input contacts, the solenoid assembly and the toroidal sensor assembly being arranged within a plane disposed between the printed circuit board and the set of receptacle terminals.

31. The system of claim 30, wherein the power input plug assembly further comprises:

a first housing portion;

a second housing portion configured to mate with the first housing portion to thereby form the power input plug housing; and

a plurality of contacts including blade elements, the plurality of contacts being disposed in either the first housing portion or the second housing portion or both, the blade elements being configured to displace insulation disposed on the plurality of wires when the second housing portion is coupled to the first housing portion, whereby electrical continuity is established between each wire and a corresponding one of the plurality of contacts.

32. The system of claim 30, further comprising a latch member disposed on the power input plug assembly, the latch member being configured to engage a latching portion of the power input receptacle to latch the power input plug assembly within the power input receptacle.

33. The system of claim 30, wherein the power input plug assembly includes female electrical contacts substantially inaccessible to a user such that the power input plug assembly is safely removable from the protective wiring device when energized.

34. The system of claim 30, wherein the power input plug assembly may be safely inserted into a second electrical wiring device when energized to thereby provide power to the second electrical wiring device.

35. The system of claim 30, wherein the printed circuit board is substantially disposed between the set of power input contacts and the toroidal sensor assembly within the back cover member.

36. The system of claim 30, wherein the power input plug housing includes a first housing portion and a second housing portion, the second housing portion extending from the first housing portion in a substantially orthogonal direction.

37. The system of claim 36, wherein the first housing portion is configured to be inserted into the power input receptacle, and wherein the second housing portion is disposed adjacent the back major surface when the first housing portion is inserted into the power input receptacle.

38. A method for installing an electrical wiring device within an electrical distribution circuit, the electrical distribution circuit including a plurality of electrical conductors coupled to a source of electrical power, the method comprising:

providing a power input plug including a plurality of conductive elements;

providing a protective wiring device comprising,

a housing including a front cover member having a front major surface and a back cover member having a back major surface arranged substantially in parallel with the front major surface, the front major surface including at least one set of plug blade apertures configured to accept a set of plug blades from a corded plug, the back cover including a power input receptacle formed at a first housing end, the power input receptacle being configured to receive the power input plug,

a set of receptacle terminals disposed within the front cover member, the set of receptacle terminals including a set of receptacle contacts that are accessible via the at least one set of plug blade apertures,

a power input assembly including a set of power input contacts disposed in the back cover member within the power input receptacle, the set of power input contacts being configured to mate with the power input plug when the power input plug is inserted into the power input receptacle, the set of power input contacts being connected to a plurality of conductive paths, the plurality of conductive paths being coupled to the set of receptacle terminals in a reset state and decoupled from the set of receptacle terminals in a tripped state, and a protective electrical circuit assembly including a toroidal sensor assembly coupled to the power input assembly, the protective electrical assembly further including a printed circuit board disposed adjacent the set of power input contacts in a plane substantially parallel to the back major surface, the printed circuit board including a fault detection circuit, a solenoid assembly, and at least a portion of a circuit interrupter mounted thereon, the set of power input contacts, the solenoid assembly and the toroidal sensor assembly being arranged within a plane disposed between the printed circuit board and the set of receptacle terminals;

connecting the plurality of conductive elements to the plurality of electrical conductors; and

inserting the power input plug into the power input receptacle to establish electrical continuity between the plurality of conductive paths and the plurality of conductive elements.

39. The method of claim 38, wherein the protective wiring device includes no external terminal connection elements.

40. The method of claim 38, wherein the printed circuit board is substantially disposed between the set of power input contacts and the toroidal sensor assembly within the back cover member.

41. The method of claim 38, wherein the protective electrical circuit assembly is selected from a group of circuit assemblies that includes a GFCI, an AFCI, a transient voltage surge suppressor (TVSS), a sensor device, and/or an environmental regulation device.