Reset lockout for circuit interrupting device

• US 6,381,112 B1
• Filed: 03/20/2000
• Issued: 04/30/2002
• Est. Priority Date: 08/24/1998
• Status: Expired due to Term

• Current Assignee: Leviton Manufacturing Company Incorporated
• Original Assignee: Leviton Manufacturing Company Incorporated
• Inventors: DiSalvo, Nicholas L.
• Primary Examiner(s): Leja, Ronald W.
• Application Number:
  US09/531,990
• Time in Patent Office: 771 Days
• Field of Search: 361/42-50, 335/18, 335/21, 335/24, 335/26, 335/202
• US Class Current: 361/42
• CPC Class Codes: H01H 2083/045 Auxiliary switch opening testing circuit in synchronism with the main circuit
• CPC Class Codes: H01H 2083/201 the other abnormal electrical condition being an arc fault
• CPC Class Codes: H01H 71/524 the contact arm being pivoted on handle and mechanism spring acting between cradle and contact arm
• CPC Class Codes: H01H 71/62 with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
• CPC Class Codes: H01H 83/04 with testing means for indicating the ability of the switch or relay to function properly
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: H02H 3/338 also responsive to wiring error, e.g. loss of neutral, break
• CPC Class Codes: H02H 5/083 responsive to the entry or leakage of a liquid into an electrical appliance moisture alarm G08B21/20

Abstract

Resettable circuit interrupting devices, such as GFCI devices, that include a reset lock-out mechanism are provided. The reset lock-out mechanism prevents the resetting of electrical connections between input and output conductors if the circuit interrupting mechanism used to break the connection is non-operational or if an open neutral condition exists.

Claims

1. A circuit interrupting device comprising:

a housing;

a first conductive path disposed at least partially within said housing and capable of being electrically connected to a source of electricity;

a second conductive path disposed at least partially within said housing and capable of conducting electrical current to a load when electrical continuity between said first and second electrical conductive paths is made;

a circuit interrupter disposed within said housing, the circuit interrupter having an operational state and a non-operational state and configured to break the continuity between said first and second conductive paths upon the occurrence of a predetermined condition;

a reset mechanism configured to make electrical continuity between the first and second conductive paths after said predetermined condition occurs; and

a reset lock-out that prevents the making of electrical continuity between said first and second conductive paths if said circuit interrupter is in the non-operational state; and

wherein activation of the reset mechanism activates the circuit interrupter to be in the operational state to move the reset lock-out to a reset position.

2. The circuit interrupting device according to claim 1, wherein said circuit interrupter includes a trip mechanism used to make and break electrical continuity between said first and second electrical conductive paths, and sensing circuitry used to sense the occurrence of said predetermined condition.

3. The circuit interrupting device according to claim 2, wherein said trip mechanism uses electro-mechanical components to make and break electrical continuity between said first and second electrical conductive paths.

4. The circuit interrupting device according to claim 1, wherein said condition comprises a ground fault, an arc fault, an appliance leakage fault, an immersion fault or a test cycle.

5. A circuit interrupting device comprising:

a housing;

a first electrical conductor disposed at least partially within said housing and capable of being electrically connected to a source of electricity;

a second electrical conductor disposed at least partially within said housing and capable of conducting electrical current to a load when electrically connected to said first electrical conductor;

a circuit interrupter disposed within said housing and configured to cause electrical discontinuity between said first and second conductors upon the occurrence of a predetermined condition;

a reset mechanism configured to reestablish electrical continuity between the first and second conductors after said predetermined condition occurs; and

a reset lock-out that prevents reestablishment of electrical continuity between said first and second conductors if said circuit interrupter is non-operational.

6. The circuit interrupting device according to claim 5, wherein said condition comprises a ground fault, an arc fault, an appliance leakage fault, an immersion fault or a test cycle.

7. The circuit interrupting device according to claim 5, wherein said circuit interrupter includes a trip mechanism for breaking electrical continuity between said first and second electrical conductors, and sensing circuitry for sensing the occurrence of said predetermined condition.

8. The circuit interrupting device according to claim 7, wherein said trip mechanism further comprises an electro-mechanical component.

9. The circuit interrupting device according to claim 8, wherein said electro-mechanical component further comprises a solenoid.

10. The circuit interrupting device according to claim 7, wherein said trip mechanism further comprises an electronic component.

11. The circuit interrupting device according to claim 10, wherein said electronic component further comprises a semiconductor switching device.

12. The circuit interrupting device according to claim 7, wherein said reset lock-out prevents the making of electrical continuity between said first and second conductors if said trip mechanism is non-operational.

13. The circuit interrupting device according to claim 7, wherein said reset lock-out prevents the making of electrical continuity between said first and second conductors if said sensing circuitry is non-operational.

14. The circuit interrupting device according to claim 7, wherein said condition comprises ground fault.

15. The circuit interrupting device according to claim 7, wherein said trip mechanism is connected to said source of electricity, and wherein said source of electricity comprises a phase line.

16. The circuit interrupting device according to claim 7, wherein said trip mechanism is connected to a neutral line.

17. A circuit interrupting device comprising:

a housing;

a first electrical conductive path disposed at least partially within said housing and capable of being electrically connected to a source of electricity;

a second electrical conductive path disposed at least partially within said housing and capable of conducting electrical current to a load when electrical continuity between said first and second electrical conductive paths is made;

a circuit interrupter disposed within said housing, the circuit interrupter having an operational state and a non-operational state and configured to break the continuity between said first and second conductive paths upon the occurrence of a predetermined condition;

a reset mechanism configured to make electrical continuity between the first and second conductive paths after said predetermined condition occurs; and

a reset lock-out that prevents the making of electrical continuity between said first and second conductive paths if an open neutral condition exists; and

wherein activation of the reset mechanism activates the circuit interrupter to be in the operational state to move the reset lock-out to a reset position.

18. The circuit interrupting device according to claim 17, wherein said condition comprises a ground fault, an arc fault, an appliance leakage fault, an immersion fault or a test cycle.

19. A method for locking-out a reset device of a circuit interrupting device having a housing, an input conductor disposed at least partially within the housing and electrically connected to a source of electricity, and an output conductor disposed at least partially within the housing and capable of conducting electrical current to a load when electrical continuity between the input and output conductors is made, comprising:

providing a circuit interrupter having a non-operational state and an operational state;

sensing the occurrence of a predefined condition;

breaking electrical continuity between the input and output conductors when said predefined condition is sensed by enabling the circuit interrupter;

enabling a lock-out device, if the circuit interrupter is in the non-operational state, to inhibit the making of electrical continuity between the input and output conductors after breaking electrical continuity between said conductors; and

enabling said circuit interrupter to be in the operational state in response to activation of said reset device to disable said lock-out device by moving the lock-out device to a reset position, and to make electrical continuity between said input and output conductors, wherein said lock-out device is not disabled if said circuit interrupter is non-operational.

20. The method according to claim 19, wherein,

said circuit interrupting device includes a second input conductor disposed at least partially within the housing and electrically connected to a second source of electricity, wherein said source of electricity further comprises a phase line and said second source of electricity further comprises a neutral line; and

wherein said lock-out device is not disabled if said neutral line is open.

21. The method according to claim 19, wherein said predefined condition comprises a ground fault, an arc fault, an appliance leakage fault, an immersion fault, or a test cycle.

22. A circuit interrupting device comprising:

a housing;

a first electrical conductor disposed at least partially within said housing and capable of being electrically connected to a phase line;

a second electrical conductor disposed at least partially within said housing and capable of conducting electrical current to a phase line of a load when electrically connected to said first electrical conductor;

a third electrical conductor disposed at least partially within said housing and capable of being electrically connected to a neutral line;

a fourth electrical conductor disposed at least partially within said housing and capable of conducting electrical current to a neutral line of a load when electrically connected to said third electrical conductor;

a circuit interrupter disposed within said housing, the circuit interrupter having an operational state and a non-operational state and configured to cause electrical discontinuity between said first and second conductors upon the occurrence of a predetermined condition;

a reset device configured to reestablish electrical continuity between the first and second conductors after said discontinuity is caused; and

a reset lock-out device that prevents reestablishment of electrical continuity between said first and second conductors if said third electrical conductor is not connected to a neutral line; and

wherein activation of the reset device activates the circuit interrupter to be in the operational state to move the reset lock-out device to a reset position.