Have you heard about the 2026 RV rule? It’s a National Electrical Code rule that will require all new 30-amp and 50-amp RVs to include a Grounding Monitor Interrupter (GMI), a device designed to prevent unsafe electrical shocks. The GMI inspects the campground pedestal to ensure proper grounding before sending electricity into your rig. It immediately cuts power if it finds a problem.
For RVers, this means better protection against “hot skin” hazards—but it could also leave your rig without power at some campgrounds until you fix the issue.
How the 2026 RV rule introduces grounding monitor interrupters
A GMI is a safety device that ensures your RV’s metal frame and body remain properly grounded. Unlike a GFCI (ground fault circuit interrupter), which monitors current imbalances, a GMI focuses entirely on grounding. If the pedestal you plug into isn’t wired correctly or loses its ground during use, the GMI will cut power instantly. This prevents the dangerous “hot skin” condition, where your RV’s metal exterior could become electrified.
Why RVers need to understand the 2026 RV rule and GMI safety
For travelers, this change adds a critical layer of protection—but it may also cause short-term frustration. Older or poorly maintained campgrounds may not meet the new grounding requirements. When you plug in a properly equipped RV, the GMI could refuse to power up your rig, leaving you without electricity until the pedestal is repaired or you move to another site.
Some sources have suggested that a campground could opt to install new GMI equipment on their pedestals. That could create issues for older, non-GMI equipped RVs. HOWEVER, it appears at this point that campgrounds are NOT planning to install such equipment.
How the 2026 RV rule affects campground electrical systems
RV parks and campgrounds will need to test their electrical systems to ensure all pedestals have solid ground continuity. Simple 30-amp and 50-amp testing tools are available to identify problem sites before RVers arrive. Parks that stay ahead of this requirement may advertise “GMI-compatible” pedestals to reassure visitors.
What RVers should do to comply with the 2026 RV rule
The 2026 RV rule and its Grounding Monitor Interrupter requirement represent a major safety improvement. Updating your power cords and adapters, checking pedestal compatibility, and being aware of potential trips at older campgrounds can help ensure smooth travel. While it could cause temporary inconvenience at some sites, the system is designed to protect you, your passengers, and your RV from electrical hazards.
And here’s one more “lookout.” While the rule directs manufacturers of new RVs to install GMI systems after the implementation date sometime in 2026 (yet to be determined), some RV parks may take a “safety first” (and cover their liability) stance. What could that mean?
RVers could conceivably see some parks begin to require ALL RVs, not just new ones, to have GMI protection on their rigs. While the RV Industry Association says that retrofit devices “are not yet widely available,” the implication is that they will eventually hit the market. Take that “not yet widely available” statement with a major grain of salt. At this point there are NO retrofit devices being marketed. If they do roll out, costs are yet to be seen.
UPDATED 11/24/2025: Major RV electrical requirement pushed to 2027 amid equipment shortage
SOURCE: RV Industry Association
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RVT1230b
Actually, I check for proper wiring before I plug my RV into the pedestal. If I am slow, it adds 20 seconds to the connection process.
Yes. Before backing in to a site, I plug our Hughes Power Watchdog in, flip the breaker, and wait 5 seconds.
This has saved our trailer from an open ground, from an open neutral, and a loose hot line (3 different campgrounds). Each of these avoided repairs more than the cost for the device. Surge protection is merely a plus.
If you look online for Ground Monitor Interrupt, you will find NEC and RVIA articles, but no devices for sale!!
Does the Power Watchdog and other similar devices qualify as a GMI?
It sure does, that’s happened to me twice where no ground or faulty ground was detected and refused to turn on. The one park I went to in Florida looked suspicious from the get go very ghetto and no pedestal just wires coming out of conduit at ground level my watchdog turned red immediately “no ground detected” the manager a scruffy homeless looking dude suggested, actually demanded that I not use the watchdog “just plug it right in it will work fine”. I said no thanks while he ran around trying to get others to share their electric. We left and never got reimbursed. I didn’t care I was glad we didn’t have to stay there it was so bad. We ended up in a beautiful state park right on the water.
Not necessarily. The cheapo versions protect you against nothing. They just light idiot lights and you need to be staring at the device the instant the problem occurs.
I just looked on Amazon for a GMI and they didn’t have anything available. I used the full name, but there were no matches.
Most good RV surge protectors will have that function. I highly recommend the Power Watchdog, not the cheapest but probably the most popular. It also connects to your phone so you can monitor your usage and if there’s a problem it will tell you why and you can reset the circuit usually right from your phone because it will interrupt service for numerous unsafe conditions before the breaker will trip. No I don’t work for them. If I had one as a newbie it would have saved me from blowing up my AC which cost me a lot to replace. So yeah get something.
I’m starting to like the fact that we dry camp 90% of the time.
They better make the system recognize the advanced surge systems that will alert you immediately if you have an open ground.
I hardwired a Southwire Surge Guard unit in my TT as well as the remote monitor panel a couple years ago. It monitors shore power continuously and shuts off when it detects power surges, open ground, open neutral, low or excessive voltage, miswired pedestals, or reverse polarity.
It would appear they have been available for some time now, just not mandatory.
Of course, it has never been used except at home as all our camping since installing it has been boondocking.
Oh, and when first plugged in, there is a 2 minute delay while the Surge Guard analyzes the electrical connect before it will pass any power to my trailer. I am not sure what else this “new” GMI will do that my surge guard won’t. Sound like they just changed the name and made it mandatory.
Let’s see how long it takes to work the bugs out of the GMI system.When arc fault breakers first came out, there were some issues like when a ceiling fan or vacumn cleaner was turned on the breaker would trip. They eventually got it fixed but there was a lot of frustration in the beginning.
I Believe some of this information is AI generated and incorrect. Mike Sokol will clarify some issues with this soon He has been the leader in RV electronics for years. I would hope that all of the input side of all these articles are screened for accuracy prior to posting. IMHO.
Yes! Mike Sokol has kept campground electrical regulations under good control for years. He has great advice for us.
I believe my Progressive Industries EMS system provides this protection. I recently had an Open Ground error and no power into my 5th wheel while plugged into my garage where it had always been just fine. I found that the subpanel ground wire connector had corroded off the grounding rod. Once I replaced the connector it is just fine again.
Most building codes are there for a reason. Many building codes are developed when contractors get in bed with bureaucrats
Mike Sokol published an article about GMI Oct 13, the day after this article. In his article he noted GMI is only installed in the RV, not campground pedastals.
Just an FYI for the other commenters. You can not buy a GMI device and probably won’t be able to for some time. They are for trailer OEM’s to install. Campgrounds will not install GMI devices because they don’t exist for them. This is for newer RV’s only and will cause some grief for those “early adopters”.
Not sure if you read my comment above, but what will a “GMI” do my Southwire Surge Guard won’t??
I have the Progressive Industries (EMS-HW30C) wired into my RV and it checks for an open ground among other checks. Is that sufficient?
Would carrying a power watchdog fulfill these potential new requirements?
Oops, never mind, saw the answer below!
How is this going to work for boondockers using a generator. They are all open ground.
Thank you for the news, Russ and Tina! Hopefully our 2022 rig has the necessary hardware to not fall victim to a power pedestal refusing to send power into our rig. Have a great week, grand 2026, and safe travels!