Grace Technologies, Inc.

Grace Engineered Products, Inc.

Philip Brown Allen

Mark Alan Hockert

Drew Philip Allen

An electrical safety monitoring system is provided. The system includes an analog circuit having line inputs for hardwiring an L1, an L2, an L3, and a GND three-phase connections, the analog circuit configured to monitor if voltage exists between any two of the line inputs, a heartbeat circuit electrically connected to the analog circuit to provide a heartbeat signal indicative of voltage present on any of the line inputs, an isolated voltage source electrically connected to the heartbeat circuit to power the heartbeat circuit with a VDC+ and a VDC&#x2212;, and a logic circuit in operative communication with the heartbeat circuit for monitoring input from the heartbeat circuit and decoding the input from the heart beat circuit. The isolated voltage source may be supplied by a programmable logic controller (PLC) and the logic circuit may be implemented within the same PLC as a function block.

Electrical safety monitoring system utilizing a heartbeat signal indicative of voltage present on line inputs

A convenience interface device is provided for personnel to access devices that reside inside an enclosure without opening the enclosure door. The convenience interface device includes a housing, a cover assembly comprising a cover and a cover receiving frame operatively connected to the housing, a first metal insert and a first magnet for magnetically connecting together, one of the first metal insert and the first magnet on one of the cover or the receiving frame and the other of the first metal insert and the first magnet on the other of the cover or the receiving frame, and a second metal insert and a second magnet for magnetically connecting together, one of the second metal insert and the second magnet on one of the cover or the receiving frame and the other of the second metal insert and the second magnet on the other of the cover or the receiving frame. The housing passes through an opening in the enclosure door and includes inside and outside outlet faces. The cover may be held closed by the magnet and metal inserts or alternatively by screws when a more secure closure is needed.

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Davenport, IA, United States of America

Philip Brown Allen