If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
Have found in almost every campground I've been in. Outlet or in the breaker. Don't doubt that it's in the future).
Outlets became part of the National Electric Code in the early 70's. System upgraded, should have GFCI on the 15 Amp receptacles. Don't know when it started.
National Electric Code. Wired or with a wire not connected sometime in your camping experience. You may also find incorrect receptacles.
Sockets are not correct and the RV plug won't go in. No way to connect a "ganged" breaker or a 240 Volt application. Have been manufactured over the years.
Tester or voltmeter. Have about 240 Volts applied. Before you plug in.
Problems for less that $5 at a hardware or building supply store. And measure the voltage and/or frequency. Into the standard 15 Amp receptacle.
Receptacle and check the 30 Amp receptacle. Thing(s) in the RV will probably need to be repaired or replaced. GFCI - My simple explanation.
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