In which NEC revision were GFCIs first required?

The requirement for Ground Fault Circuit Interrupters (GFCIs) was first introduced in the National Electrical Code (NEC) in the 1971 revision. This revision marked a significant advancement in electrical safety standards, particularly concerning protection against electrical shock in areas where moisture is present, such as bathrooms, kitchens, and outdoor locations. The inclusion of GFCI requirements was a proactive measure to enhance safety in residential and commercial wiring, reducing the risks associated with ground faults, which can lead to serious electric shock injuries or even fatalities. Understanding this timeline helps in appreciating how electrical safety standards have evolved to protect individuals from hazardous electrical situations.