What type of receptacles in crawl spaces require GFCI protection?

The requirement for GFCI (Ground Fault Circuit Interrupter) protection in crawl spaces can be traced to the National Electrical Code (NEC) provisions that address safety in areas where moisture is present, such as crawl spaces. According to the NEC, any receptacle located in a crawl space is required to be protected by GFCI, particularly to mitigate the risk of electrical shock due to the damp conditions commonly found in such areas.

The correct answer specifies 15 and 30A receptacles, as these are common amperage ratings for receptacles that are utilized in different applications, including those found in crawl spaces. GFCI protection is mandated for 15A and 20A receptacles serving general use, but 30A receptacles also need to comply with GFCI protection when utilized in specific circumstances.

While it's important to consider the overall requirement for GFCI protection in crawl spaces, this particular choice is reflective of the NEC's broader intent to ensure safety standards are applied based on the amperage ratings that are relevant to the receptacles being used. Other amperage receptacles, such as those above 30A, would typically not be required for GFCI in a crawl space unless they were specifically outlined in code