1. Field
The disclosed concept pertains generally to electrical systems. The disclosed concept also pertains to electrical switching apparatus, such as circuit breakers, for electrical systems. The disclosed concept further pertains to guard assemblies for electrical switching apparatus.
2. Background Information
Electrical apparatus, such as electrical switching apparatus, are used to protect electrical circuitry from damage due to a trip condition, such as, for example, an overcurrent condition, an overload condition, an undervoltage condition, a relatively high level short circuit or fault condition, a ground fault or arc fault condition. Circuit breakers, for example, commonly include wiring terminals as a means to attach wires. While the wires are generally insulated, the end that attaches to the circuit breaker wiring terminal has the insulation removed (i.e., stripped).
It is common that the stripped portion of these wires extends to some degree outside the circuit breaker wiring terminal, such that, when a person is exposed to the circuit breaker and associated wiring, the person is also exposed to some portion of the uninsulated wires, and possibly also the uninsulated portion of the circuit breaker wiring terminal. This exposure to uninsulated electrically energized conductors (wires and/or wiring terminals) allows for the possibility of inadvertent contact by a person, tool, or the like, while performing various types of service or maintenance activities. It also allows a condition whereas a person may potentially be exposed to an arc flash hazard.
There is, therefore, room for improvement in electrical systems, and in electrical switching apparatus and guard assemblies therefor.
These needs and others are met by embodiments of the disclosed concept, which are directed to a guard assembly, which among other benefits, guards the exposed portion of a conductor.
As one aspect of the disclosed, a guard assembly for an electrical switching apparatus of an electrical system is provided. The electrical system includes a number of conductors each having an insulated portion and an exposed portion. The exposed portion and the insulated portion meet at a junction. The electrical switching apparatus includes a housing and a number of terminals located internal with respect to the housing. Each of the terminals are connected to the exposed portion of a corresponding one of the conductors. The guard assembly comprises: an interconnect member coupled to the housing; and a number of guard members each comprising: a first portion coupled to the interconnect member, and a second portion extending from the first portion away from the housing, the second portion comprising: a first distal end located at the first portion, and a second distal end opposite and distal from the first distal end. Each of the guard members has an opening. The opening receives at least one of the conductors. Each junction is located between a corresponding second distal end and a corresponding one of the terminals.
As another aspect of the disclosed concept, an electrical switching apparatus of an electrical system is provided. The electrical system includes a number of conductors each having an insulated portion and an exposed portion. The exposed portion and the insulated portion meet at a junction. The electrical switching apparatus comprises: a housing; a number of terminals located internal with respect to the housing, each of the terminals being connected to the exposed portion of a corresponding one of the conductors; and a guard assembly comprising: an interconnect member coupled to the housing; and a number of guard members each comprising: a first portion coupled to the interconnect member, and a second portion extending from the first portion away from the housing, the second portion comprising: a first distal end located at the first portion, and a second distal end opposite and distal from the first distal end. Each of the guard members has an opening. The opening is structured to receive at least one of the conductors. Each junction is located between a corresponding second distal end and a corresponding one of the terminals.
As another aspect of the disclosed concept, an electrical system is provided. The electrical system comprises: a number of conductors each comprising an insulated portion and an exposed portion, the exposed portion and the insulated portion meeting at a junction; and an electrical switching apparatus comprising: a housing, a number of terminals located internal with respect to the housing, each of the terminals being connected to the exposed portion of a corresponding one of the conductors, and a guard assembly comprising: an interconnect member coupled to the housing, and a number of guard members each comprising: a first portion coupled to the interconnect member, and a second portion extending from the first portion away from the housing, the second portion comprising: a first distal end located at the first portion, and a second distal end opposite and distal from the first distal end. Each of the guard members has an opening. The opening receives at least one of the conductors. Each junction is located between a corresponding second distal end and a corresponding one of the terminals.
A full understanding of the disclosed concept can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which:
As employed herein, the term “number” shall mean one or an integer greater than one (i.e., a plurality).
As employed herein, the statement that two or more parts are “connected” or “coupled” together shall mean that the parts are joined together either directly or joined through one or more intermediate parts.
As employed herein, the statement that two or more parts or components “engage” one another shall mean that the parts touch and/or exert a force against one another either directly or through one or more intermediate parts or components.
As employed herein, the term “coupling member” refers to any suitable connecting or tightening mechanism expressly including, but not limited to, rivets, screws, bolts and the combinations of bolts and nuts (e.g., without limitation, lock nuts) and bolts, washers and nuts, zip ties, wire ties, tape and/or an adhesive.
The guard assembly 100 includes an insulative interconnect member 110 and a number of insulative guard members 130 connected to the interconnect member 110. The conductors 6 each extend entirely through a corresponding one of the guard members 130. The guard members 130 are each preferably made of an elastomeric material. The interconnect member 110 is preferably made of a thermoplastic (e.g., an injection molded piece).
Each of the guard members 130 includes a planar portion 132 and a tubular portion 134 that is generally perpendicular to the planar portion 132. The tubular portion 134 has a distal end 136 located at the planar portion 132, and a distal end 138 located opposite and distal from the first distal end 136. The guard member 130 also has an opening 139 extending through both the tubular portion 134 and the planar portion 132. The conductor 6 extends through the opening 139 in order to be connected to the terminal screw 16. As shown in
In this manner, the exposed portion 10 of the conductor 6, and the terminal 14 are advantageously well protected from inadvertent contact by an operator or a tool, therefore improving safety. More specifically, the housing 18, the interconnect member 110, and the guard member 130 surround the exposed portion 10 of the conductor 6. Because the interconnect member 110 and the guard member 130 are insulative, the likelihood of having an electrical pathway between an operator and the exposed portion 10, or between an operator and the terminal 14, is significantly diminished. For example, if an operator inadvertently contacts the guard member 130 and the guard member 130 deflects into the exposed portion 10, the insulative properties of the guard member 130 will advantageously protect the operator from electrical exposure. Additionally, if an operator contacts the distal end 138 and the distal end 138 deflects into the insulated portion 8, the insulative properties of each of the guard member 130 and the insulated portion 8 of the conductor 6 will advantageously protect the operator from electrical exposure.
It will be appreciated that the disclosed concept is not limited to the electrical system 2. For example,
The guard assembly 300 includes an insulative interconnect member 310 and a single insulative guard member 330 connected to the interconnect member 310. The conductors 206 each extend entirely through the guard member 330 in order to be electrically connected with the terminals of the circuit breaker 204 in a similar manner as discussed above in association with the electrical system 2 (
The circuit breaker 204 includes a housing 218 and a plurality of terminals located internal the housing 218. Furthermore, the housing 218 has a number of slots (see, for example, three slots 219, shown in hidden line drawing in
Continuing to refer to
The body portion 312 has a number of thru holes 316, and the first portion 332 of the guard member 330 has a number of apertures 336. Furthermore, the guard assembly 300 includes a number of coupling members (see, for example, coupling members 350, shown in
The guard member 330 also preferably has a flexible bellows portion 340 located in the second portion 334 between opposing distal ends 342,344 of the second portion 334. In operation, the flexible bellows portion 340 advantageously allows the guard member 330 to flex in order to allow the conductors 206 to properly mate with the terminals of the circuit breaker 204. For example, when the conductors 206 are secured to the guard member 330, the flexible bellows portion 340 allows the exposed portions (
The circuit breaker 404 includes a housing 418 that has a number of slots (see, for example, slots 419, shown in
In operation, the circuit breaker 404 partially extends into (i.e., is partially enclosed by or contained by) the guard member 530 in order that each of the thru holes 536 is aligned with (i.e., overlays or is located directly on top of) a corresponding one of the slots 419. Furthermore, each of the coupling members 550 preferably extends through two of the slots 419 of the circuit breaker 404 and two corresponding thru holes 536 of the guard member 530 in order to couple the guard member 530 to the circuit breaker 404. Additionally, the coupling member 552 extends into the thru holes 538 in order to secure the conductors 406 to the guard member 530. When the coupling member 552 is secured to the conductors 406, the guard member 530 is under tension. Stated differently, because the guard member 530 is relatively flexible, the coupling member 552 advantageously causes the guard member 530 to deflect in order to secure the conductors 406 to the guard member 530.
Similar to the guard member 330 (
Although the disclosed concept has been described in association with the molded case circuit breakers 4,204,404 it will be appreciated that the disclosed concept is applicable to any known or suitable alternative electrical switching apparatus, such as, for example and without limitation, a power circuit breaker (not shown) and/or a fusible switch (not shown).
Accordingly, it will be appreciated that the disclosed concept provides for an improved (e.g., without limitation, better protected) electrical system 2,202,402 and electrical switching apparatus 4,204,404 and guard assembly 100,300,500 therefor, which among other benefits, minimizes and/or eliminates the possibility that the exposed portion 10 of a conductor 6,206,406 will inadvertently come into contact with an operator and/or a tool. More specifically, dangerous inadvertent contact with uninsulated conductors is advantageously minimized and/or eliminated.
While specific embodiments of the disclosed concept have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the disclosed concept which is to be given the full breadth of the claims appended and any and all equivalents thereof.
This application claims priority from and claims the benefit of U.S. Provisional Patent Application Serial No. 62/104,973, filed Jan. 19, 2015.
Number | Date | Country | |
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62104973 | Jan 2015 | US |