Final answer:
GFCIs are set to interrupt circuit flow when the leakage current exceeds 5 mA to protect against electrical shock.
Step-by-step explanation:
Properly functioning Ground Fault Circuit Interrupters (GFCIs) are designed to interrupt circuit flow when the leakage current is greater than 5 mA (milliamperes). GFCIs play a crucial role in preventing electrical shock by monitoring the current in both live/hot and neutral wires. If an imbalance is detected, indicating that the leakage current is taking an alternative, potentially hazardous path, the GFCI will trip, and disrupt the flow of electricity to protect individuals from electric shock. This feature is especially important in areas with a high risk of water exposure, such as kitchens and bathrooms.