CPC G01R 19/155 (2013.01) [G01R 19/2513 (2013.01)] | 18 Claims |
1. An electrical safety monitoring system comprising:
a housing;
a plurality of visual indicators operatively connected to the housing;
an analog circuit disposed within the housing and having line inputs for hardwiring a first line (L1), a second line (L2), a third line (L3), and a ground (GND), wherein each of the line inputs is a three-phase connection, wherein the analog circuit is configured to monitor if voltage exists between any two of the line inputs and further configured to visually indicate presence of voltage on each of the line inputs using the plurality of visual indicators operatively connected to the housing;
a heartbeat circuit electrically connected to the analog circuit to provide a heartbeat signal indicative of voltage present on any of the line inputs, the heartbeat signal encoding state information for each of the line inputs for the first line (L1), the second line (L2), the third line (L3) and the ground (GND);
an isolated voltage source electrically connected to the heartbeat circuit to power the heartbeat circuit with a VDC+ and a VDC−;
a logic circuit in operative communication with the heartbeat circuit for monitoring input from the heartbeat circuit and decoding the input from the heartbeat circuit to determine state information for each of the line inputs for the first line (L1), the second line (L2), the third line (L3) and the ground (GND).
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