Switchgear ground and test device having interchangeable grounding bars
A ground and test (G&T) device includes a test device housing having load and line conductors and a plurality of upper terminals and plurality of lower terminals carried by the test device housing and configured to engage the load and line conductors when the test device housing in installed within the compartment of the switchgear frame. A lower ground bus bar is carried by the test device housing and a plurality of grounding bars selectively connect either the upper terminals to the lower ground bus bar or connect the lower terminals to the lower ground bus bar. A ground shoe assembly is connected to the lower ground bus bar and configured to engage a grounding circuit carried by the switchgear frame.
1. A ground and test (G&T) device, comprising:
a test device housing configured to be removably installed within a compartment of a switchgear frame;
a plurality of upper terminals and plurality of lower terminals carried by the test device housing;
a lower ground bus bar carried by the test device housing;
a plurality of grounding bars that selectively connect either the upper terminals to the lower ground bus bar or connect the lower terminals to the lower ground bus bar; and
a ground shoe assembly connected to the lower ground bus bar and configured to engage a grounding circuit carried by the switchgear frame.
2. The G&T device of claim 1 , comprising three upper terminals and three lower terminals configured to engage three-phase load and line conductors contained in the compartment of the switchgear frame.
3. The G&T device of claim 1 , wherein each grounding bar is similarly configured and interchangeable with each other.
4. The G&T device of claim 3 , wherein each grounding bar comprises an upper flat end that is configured to engage either an upper or lower terminal from the plurality of upper terminals or the plurality of lower terminals, respectively, an outwardly angled section that extends outward from the test device housing, and a vertically extending lower flat section that is configured to engage the lower ground bus bar.
5. The G&T device of claim 1 , wherein said test device housing includes a front panel having removable upper and lower doors to expose said plurality of upper and said plurality of lower terminals onto which the grounding bars are secured.
6. The G&T device of claim 1 , wherein said plurality of upper and plurality of lower terminals comprise upper and lower contact arms each carrying cluster assemblies.
7. The G&T device of claim 1 , wherein said ground shoe assembly comprises a ground shoe bracket and first and second opposing bus bars each having first and second ends and carried by said ground shoe bracket, said first ends engaging the grounding circuit, and first and second flexible cables interconnecting each of said second ends to the lower ground bus bar.
8. The G&T device of claim 7 , comprising die springs carried by said ground shoe bracket and configured to bias first and second opposing bus bars against each other.
9. The G&T device of claim 8 , wherein each of said first ends of each of said first and second opposing bus bars include flared ends that extend outward, and said grounding circuit includes a grounding bar over which the flared ends engage as the test device housing is inserted within the compartment of the switchgear frame.
10. The G&T device of claim 7 , wherein said first and second flexible cables each comprises a braided cable.
11. A method of operating a ground and test (G&T) device, comprising:
installing a test device housing having a plurality of upper and lower terminals within a compartment of a switchgear frame;
selectively connecting the upper terminals to a lower ground bus bar carried by the test device housing or connecting the lower terminals to the lower ground bus bar; and
connecting a ground shoe assembly to the lower ground bus bar and to a grounding circuit carried by the switchgear frame.
12. The method of claim 11 , wherein each grounding bar is similarly configured and interchangeable with each other.
13. The method of claim 12 , wherein each grounding bar comprises an upper flat end that is configured to engage either an upper or lower terminal from the plurality of upper terminals or the plurality of lower terminals, respectively, an outwardly angled section that extends outward from the test device housing, and a vertically extending lower flat section that is configured to engage the lower ground bus bar.
14. The method of claim 11 , wherein said ground shoe assembly comprises a ground shoe bracket and first and second opposing bus bars each having first and second ends and carried by said ground shoe bracket, said first ends engaging the grounding circuit, and first and second flexible cables interconnecting each of said second ends to the lower ground bus bar.
15. The method of claim 14 , comprising die springs carried by said ground shoe bracket and configured to bias first and second opposing bus bars against each other.
16. The method of claim 15 , wherein each of said first ends of each of said first and second opposing bus bars included flared ends that extend outward, and said grounding circuit includes a grounding bar over which the flared ends engage as the test device housing is inserted within the compartment of the switchgear frame.