Yes, Article 422.51 of the National Electrical Code (NEC) is retroactive.Article 422.51 requires the installation of ground fault circuit interrupters (GFCIs) in all kitchens, bathrooms, garages, and outdoor receptacles. This requirement applies to all existing and newly constructed buildings.If a building does not have GFCIs installed in the required locations, the owner or occupant is responsible for having them installed. This is because the NEC is a safety code that is intended to protect people from electrical hazards.The NEC is updated every three years, and the 2023 NEC includes a number of changes that are retroactive. These changes include the requirement for GFCIs in all kitchens, bathrooms, garages, and outdoor receptacles.If you are unsure whether your home or business is in compliance with the NEC, you should contact a qualified electrician. Flag for review