Now if you consider it a bit, this ground plane doesn’t must be connected by any means to the earth ground which will work properly. So in engineering we recall to mind it as a chassis or local ground. Also note that this ground plane can become electrically energized with a voltage capabilities above earth ground if it’s not properly bonded connected to the shore power’s impartial ground bonding point more on that below. The thing we call a hot skin stray voltage is in reality the bottom plane chassis ground of the RV being electrically elevated above the abilities voltage of the earth. Well, yes, in a way it is.
But it’s not really “THE GROUND” that’s used in campground electricity to protect you from electric shock due to a hot skin ground plane. This earth ground is based by a ground rod more properly called an “earthing rod”, which pokes into the dirt by 8 ft. or more. However, while the earth itself is a extremely good ground for lightning strikes, it’s a stunning poor ground when it comes to draining away any AC fault currents on the chassis of your RV. That’s as a result of a ground rod could have up to 25 ohms of resistance to the earth technically “impedance” at 60 Hz and that’s not enough conductivity to trip a circuit breaker in the event of a short circuit in your AC wiring. And in many cases with dry, sandy soil, the ground rod impedance can be on the order of 100 ohms.
For something really fun in a geeky way, search for the Ufer ground, which was designed by a guy named Herbert Ufer in the 1940’s for military installations in the desert. Read more on the Ufer ground HERE. However, many if not most small inverter generators under 5,000 watts 5 kw similar to the Honda EU2000i don’t “ground the impartial” within themselves. Instead they have something called a floating impartial with out any electrical connection to the chassis/ground of the generator itself. This doesn’t hurt most home equipment in anyway, except that when you have an clever/ems surge protector from Surge Guard or Progressive, it is going to interpret this floating neutral as a broken ground from the shore power supply, and close off the ability to your RV. UPDATE: On March 6, 2019, RV Daily Report published a piece of writing indicating that Honda had issued a stop sell order and recall as of February 12 on bound Honda EU2200i and EB2200i portable turbines.
Now it’s back to the mathematics for Ohm’s Law. That 120 amps of fault present will trip any 20 , 30 or 50 amp circuit breaker in your RV simply, typically within a fraction of a second. And that’s what actually keeps you safe from a hot skin/stray voltage on your RV. The ground rod at the carrier panel and even your RV if you add one your self doesn’t do that at all, as it’s only there for lightning coverage.