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GFCI (Ground Fault Circuit Interrupter) protection is crucial in environments where there is an increased risk of electrical shock, such as carnivals, circuses, and fairs. Receptacle outlets rated for 15, 20, and 30 amperes are specifically required to have GFCI protection due to the varied electrical equipment and temporary installations often found in these settings.

The reasoning for focusing on these amperages includes the fact that 15 and 20-amp receptacles are commonly used for general-purpose circuits and are likely to power various portable equipment and devices. The inclusion of 30-amp receptacles accounts for larger equipment that may be used at such events, which could also pose a risk if not properly protected.

GFCIs are designed to quickly disconnect power when they detect ground faults, significantly reducing the risk of electric shock in wet or outdoor conditions, which are prevalent in carnival environments. Hence, the requirement for GFCI protection for these specific amperages is a safety measure ensuring that the equipment used is less likely to cause harm to individuals in high-footfall areas where moisture and various other hazards exist.