New RV Electrical Safety Rule Is Coming: What a GMI Does

The problem it solves

When the ground path between an RV and shore power is broken or wired incorrectly, the metal exterior of the vehicle can become energized. The industry calls it 'hot skin,' and you often cannot see or hear it — you feel it when you touch the step or the door handle while standing on the ground.

A Grounding Monitor Interrupter watches that ground connection and cuts power when it is not safe, in the same spirit as a GFCI but aimed at the vehicle's grounding path.

What's changing

• The RV Industry Association has established a Grounding Monitor Interrupter task force.
• A GMI requirement is set to apply to Model Year 2028 RVs with 30A or 50A electrical service.
• Existing RVs are not retrofitted by the standard — owners remain responsible for their own protection.

What owners can do now

• Test pedestals before plugging in, and treat a questionable pedestal as a reason to move sites.
• Never defeat or adapt away the ground pin.
• Have shore power wiring inspected after any electrical work or damage.
• If you feel any tingle touching your RV, stop, stay off it and disconnect at the pedestal.