Ground fault indicator PGR-3100

voltageLEDpanel-mount

The PGR-3100 series ground-fault indication system operates on ungrounded ac systems. This unit indicates the presence of voltage on each phase of a three-phase system. The LEDs on the panel illuminate when voltage is present. When a ground-fault occurs, the voltage on the faulted phase reduces to ground potential causing the LEDs for the faulted phase to dim. On a resistance grounded or ungrounded system, the LEDs for the unfaulted phases become brighter. Ungrounded ac systems are required by NEC Article 250.21(B) and Canadian Electrical Code (CEC) Part 1, Section 10-106 (2) to have ground detectors (such as the PGR-3100) installed on the system. External potential transformers (PTs) can be used to step down system voltage, allowing the PGR-3100 to be applied to any system voltage. PTs are not required for system voltages up to 600 V ac. Features NEC® and CEC code compliant Phase LEDs Redundant LEDs Lamp test button POWR-GARD® technology