For supplemental GFCI protection, where is it required?

Supplemental Ground Fault Circuit Interrupter (GFCI) protection is specifically required in areas where there is an increased potential for electric shock due to the presence of water. Swimming pools, spas, and hot tubs fall under this category because these installations typically involve water and, consequently, a higher risk of electrical hazards. The National Electrical Code (NEC) emphasizes the importance of providing GFCI protection in these locations to enhance safety for users.

This requirement stems from the understanding that water is a conductor of electricity, and thus, where water is present, the potential for dangerous electrical faults increases significantly. Implementing GFCI devices helps to reduce this risk by quickly cutting off power in case of a ground fault, protecting individuals from serious electric shocks.

In contrast, the other options mentioned do not uniquely or universally require supplemental GFCI protection in the same way as swimming pools and similar installations do.