Electrical enclosure voltage protection system
US9490610B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2015 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Dec 18, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02B3/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical isolation apparatus to automatically interrupt main power in advance of its junction to the main electrical panel whenever the main disconnect switch is turned off. A method for retrofitting an existing electrical panel enclosure with an electrical isolation box (EIB) is also disclosed, along with a retrofit kit. The electrical isolation apparatus includes an auxiliary relay resident in the main electrical panel enclosure and actuated by said main disconnect switch. The electrical isolation apparatus also includes the EIB in a second ride-on enclosure attached to the main panel enclosure. The EIB encloses a power contactor with at least one power contactor switch (three for three-phase). The control input of the power contactor is connected through both enclosures to the auxiliary relay resident in the main enclosure for controlling the power contactor. Indicator lights, a voltage monitor, and a reset/test switch panel-mounted on the EIB enclosure are also disclosed for status display. The foregoing avoids any high voltage condition in the main power receptacle after the disconnect is actuated, creating a safer work environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.