For swimming pools, the minimum size for a ground fault circuit interrupter is rated at _____ amps or less.

The correct answer is 15 Amps. In the context of swimming pools, the National Electrical Code (NEC) specifies that ground fault circuit interrupters (GFCIs) must be rated at a maximum of 15 amps for feeder conductors with swimming pool equipment. This rating is crucial because it ensures adequate protection against ground faults that can pose serious electrical hazards in areas where people are in close proximity to water.

GFCIs are designed to quickly cut off electrical supply in the event of an irregular current such as a ground fault, thereby reducing the risk of electrical shock. The lower amp rating is particularly important in these settings, as the presence of water increases the likelihood of electrical hazards, making enhanced protection necessary.

The other amp ratings listed, such as 30, 60, and 20 amps, exceed this safe threshold, and using them could potentially compromise safety in situations where pool equipment is used. This distinction emphasizes the importance of adhering to NEC guidelines specifically tailored for the safety demands of swimming pool environments.