The RV Industry Association (RVIA) Board of Directors approved a revised implementation timeline for a Grounding Monitor Interrupter (GMI) requirement in the 2026 National Electrical Code (NEC), establishing a Jan. 1, 2027, effective date and delaying mandatory enforcement until manufacturers begin their respective 2028 model year production.
The action was approved during the board’s June 4 meeting following a recommendation from the Standards Steering Committee. The decision affects Article 551.40(D) of the 2026 NEC, which addresses GMI requirements for recreational vehicles.
According to the board-approved resolution, the association will adopt Article 551.40(D) with an effective date of Jan. 1, 2027, while mandatory enforcement will begin at the start of each manufacturer’s 2028 model year production.
The requirement had previously been delayed because fully developed, listed GMIs suitable for RV manufacturing were not available when the NEC originally established a Jan. 1, 2026, compliance date, the association said.
The Standards Steering Committee continued monitoring the availability of GMI devices and concluded that sufficient products should be available for RV manufacturers to meet the revised implementation schedule.
The board’s decision provides manufacturers with an additional year before the requirement takes effect and establishes a later enforcement timeline tied to model year production schedules.
The association also reminded members that implementation of two other updated RV standards is already underway.
The 2026 edition of NFPA 1192, Standard on Recreational Vehicles, and the 2025 edition of the ANSI/RVIA Standard for DC Voltage Systems in Recreational Vehicles both became effective June 1.
Mandatory enforcement of those standards is scheduled to begin Sept. 1, according to the association.
The association said members seeking additional information on the GMI issue can review previously published materials and the latest edition of the standard addressing GMI devices.
Questions regarding the standards and enforcement timelines may be directed to Bryan Ritchie, vice president of standards; Curt Richardson, senior director of inspection services; and Tom Ramsay, senior director of standards administration and technology.