TM 5-3895-374-24-1SHIPPING DAMAGE, HANDLING & STORAGEThe GC-100 Ground Fault Relay is designed for Industrial environments Reasonable care should be exercised in handlingand storage to protect the device from excessive mechanical shock, humidity, or temperature Do not drop device Storagetemperatures should be less than 200F but more than -10°F The relay should be stored in Its original shipping carton untilready for installation when not supplied as an integral part of other electrical apparatus such as a switchboard orpanelboardExamine all components carefully for concealed shipping damage upon receipt of the equipment If damage or loss isdiscovered, file a claim with the delivering carrier Immediately, and notify the nearest Square D field office Arrange forrepair or replacement through your local Square D office before returning any components to the factoryGROUNDED POWER SYSTEMSThe GC-100 Ground Fault Relay is intended for use only on power systems which include a grounded conductor (neutralor grounded phase) The grounded conductor must be grounded at the service equipment, but the neutral may or may notbe used In the feeder or branch circuits.SYSTEM OPERATIONA block diagram of the complete system including the Sensor, Ground Fault Relay, Monitor Components, and theDisconnect Trip Coil Is shown in Figure 1. When circuit conditions are normal, the currents from all the phase conductorsand neutral (if used) add up to zero and the Sensor produces no signal When any ground fault occurs, however, thecurrents add up to equal the ground fault current and the Sensor produces a signal proportional to the ground fault. Thissignal Is sensed by the Ground Fault Relay and used to Initiate timing and other functions(page 3-89)
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