What is the correct ground-fault circuit interrupter (GFCI) level for a Class A device?

The correct ground-fault circuit interrupter (GFCI) level for a Class A device is 30 mA. This specification is crucial for ensuring safety against electrical shock. Class A GFCIs are designed to protect against ground faults in areas where there is an increased risk of electric shock, such as in bathrooms, kitchens, and outdoor locations.

The 30 mA threshold is effective in providing personal protection while minimizing the risk of nuisance tripping, which occurs when a device unnecessarily cuts the power due to minor or temporary faults. Devices with a sensitivity of 30 mA can reliably interrupt the circuit in the event of a potentially dangerous ground fault, preventing serious injury or death due to electric shock.

While other sensitivity levels provide specific protection schemes—like the 15 mA level, which is often used for applications where higher sensitivity is required—30 mA remains the standard for Class A devices that balance safety with practical usability.