Which scenario requires the installation of a GFPE device?

The installation of a Ground Fault Protection of Equipment (GFPE) device is required in scenarios where there is a potential for ground faults that could lead to equipment damage or pose safety risks. In the case of a 480/277-volt, 3-phase, 4-wire switchgear system with a 1000-A main breaker, it falls under the category of high voltage and significant load capacity, which necessitates ground fault protection.

High-voltage systems such as this one can easily develop ground faults that lead to hazardous situations, including equipment failure or fire. Ground fault protection plays a critical role in detecting these faults and interrupting the circuit's supply before damage occurs. The specific requirement for GFPE installation is often outlined in the National Electrical Code (NEC) under specific conditions for larger systems, particularly those exceeding certain amperage thresholds. The presence of three phases and the voltage level further emphasizes the need for such protective measures.

In contrast, the other scenarios presented do not meet the same criteria for the installation of GFPE devices as they involve lower voltages, lower amperage capacities, or configurations that do not typically necessitate such extensive protection measures.