Short

[nuisance]

Has this ever happened to anyone else? My 50 to 30 amp pigtail. Lost power, went out to check and my son found this at his trailer.

[Wobbles]

Wow! That looks like it failed in time to save everything. When I say "in time" I am not sure that it was designed to do that. Are the electrics inside all ok?

[5picker]

Looks like it was full of water at some point.

[Bluepill]

Most likely a loose connection at the receptacle on the power post. Not that uncommon.

[nuisance]

They lost no electronics. This happened at 3am on the coldest night of the year. We did have rain a few days earlier. Campground owner checked everything out the next day and found nothing wrong he did replace the pigtail

[wmtire]

Nuisance, so what I appear to be looking at is a 50 amp male (not shown) to a 30 amp female (shown) adapter..... with the male prongs from the RV's power cord still in the female adapter.

If so, then the RV's power cord's male end is destroyed? Correct? Since it appears the sliced/cut off hot and neutral wires are still connected to the spade terminals and inserted into the adapters female end. .

What could have easily happened here, is that someone overloaded the RV's 30 amp capability, and the RV's main 30 amp breaker failed to trip. This is why I always rail against trusting a breaker, and to make sure you manually/mentally keep your electrical power requirements to less than 30 amps.

By you using an adapter to plug your 30 amp RV into a 50 amp power pedestal, you lose your second failsafe circuit breaker on the power pedestal that would normally trip at above 30 amps.

Normally, If you overload your RV's 30 amps, the main circuit breaker either inside the RV or the 30 amp circuit breaker on the power pedestal will trip, thus saving everything.

Again though, when you plug into a 50 amp outlet via the adapter, you lose this second circuit breakers protection at the power pedestal, as it's now not going to trip till it exceeds 50 amps for a while...... so if your RV's 30 amp main fails to trip (which it appears it didn't in time) then you may burn up the power cord, as it appears happened.

You said it was the coldest night of the year, can I ask if you were perhaps running space heaters?....... which could easily cause a 30 amp overload.

Easy RV electrical math is watts= voltage X amps or another way is amps= watts/voltage.

say for example you are running a 1500 watt space heater. Using the above formula 1500 watts/120 volts = 12.5 amps.

If your water heater is also on electric, with it's 1440 watt heating element/120 volts = 12 amps

So there is 24.5 amps just with two electrical things...and this doesn't count your other 120 volt stuff that may be running at the same time..or if you tried to use two or more space heaters.

Now with all that being said, it also appears it was possibly your neutral wire that caused this problem, looking at the pic, but sometimes images are reversed in pics, and appear backwards. If the neutral, it could have been caused by a loose connection in your RV's power cord.