Ground fault interrupter with reversed line polarity lamp indicator
US3932790A · kind A · utility
52Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1972 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Feb 22, 1992 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ground fault interrupter (GFI) provided with a reversed line polarity lamp indicator to indicate proper installation of the GFI. The reversed line polarity lamp indicator includes a push button and a lamp connected in series between the line conductor of the GFI and ground. In a wiring system having a ground conductor, the series connection is between the line and the ground conductor in which case the reversed line polarity lamp indicator may also be used to check for open circuits in the ground conductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.