ELECTRICAL ENCLOSURE VOLTAGE PROTECTION SYSTEM

摘要

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.

主权项

1. An electrical isolation apparatus electrically connected to a main electrical panel of a type having a first enclosure and a main power disconnect switch mounted on said first enclosure, said electrical isolation apparatus adapted to automatically interrupt main power in advance of a junction to said main electrical panel whenever said main disconnect switch is turned off, the electrical isolation apparatus comprising:
an auxiliary relay resident in said first enclosure and actuated by said main disconnect switch; a second enclosure; a power contactor resident in said second enclosure and having at least one power contactor switch selectively interrupting said main power before said junction to said main electrical panel, and a control input connected to said auxiliary relay resident in said first enclosure for controlling said at least one power contactor switch.