In which commercial areas must 15 and 20A, single-phase, 125V receptacles be GFCI-protected?

15 and 20A, single-phase, 125V receptacles must be GFCI (Ground Fault Circuit Interrupter) protected in multiple commercial areas due to safety concerns related to the risk of electric shock in wet or damp environments. Each of the areas mentioned requires GFCI protection for different reasons, all of which align with the NEC's commitment to reducing electrical hazards.

Kitchens are considered high-risk areas where moisture from cooking and cleaning can create a potential shock hazard. Bathrooms have similar concerns, where the presence of water dramatically increases the risk of electrocution when using electrical devices. Rooftops also present unique challenges, especially if they house equipment or are accessed for maintenance, exposing receptacles to weather and moisture.

By requiring GFCI protection in all these areas, the code helps ensure the safety of individuals who may come in contact with electrical devices under less-than-ideal conditions. This necessity for GFCI protection in kitchens, bathrooms, and rooftops underscores the NEC's proactive measures in promoting electrical safety across a broad array of potentially hazardous environments.