USITT Backstage Terminology Safety Practice Exam

A GFCI is a Ground Fault Circuit Interrupter that protects people from electric shock by quickly cutting power when it detects an imbalance between the hot and neutral conductors, indicating current leakage to ground. It should be used on outlets in damp or temporary electrical installations backstage because moisture and portable setups increase the risk of shock, and the rapid shutdown helps prevent injury. It’s not a fuse that protects circuits, not a device that reduces voltage, and not a timer-style switch that turns off after a set period; those functions don’t provide the ground-fault protection needed in wet or temporary backstage environments.