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Old 05-23-2015, 07:59 AM   #11
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In a reverse polarity situation- your rig may perform fine BUT the frame
could possibly be electrified. It would be possible for your electronics to work and such but if you were grounded or standing on wet ground you could
be electrocuted simply by touching a metal part of your trailer.
Reverse polarity is bad and you don't want to stay in a site that has it!!
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Old 05-23-2015, 10:36 AM   #12
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And another thought, ground and neutral are normally bonded somewhere within the campground electrical system. Does reverse polarity mean that hot and ground are mistakenly bonded, or just that the outlet wires are reversed?
Reverse polarity is when the hot and neutral are reversed. In a home main panel the ground and neutral are "bonded" or tied together. (If you have a sub panel the ground and neutral should not be bonded at the sub panel. The hot, neutral and ground would be wired back to the main separately.)

The problem with reverse polarity is if you have an internal short to ground. A washing machine is a good example, as the frame is grounded. If wired correctly, a hot short to ground would trip the breaker immediately as a large amount of current would flow through the breaker. If a reverse polarity condition existed and you had the hot wire (now actually neutral) short to ground you would effectively be shorting the neutral to the machine frame. Since the neutral and ground are already bonded at the panel the breaker would be unaffected. If you then touched the machine, you could provide another path to ground, which would be a second path for current flow as you would be in parallel with the return path of current. That's my understanding.
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Old 05-23-2015, 01:26 PM   #13
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I just pulled out the 50A to 30A adapter and got my 30A hookup from the 50A plug. The 30A has two prongs (other than the ground). One is not, the other is the neutral. On a 50A, there are two hot legs and the neutral is on the middle prong. Sort of hard to get those reversed and my EMS showed it as being OK.
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Old 05-23-2015, 01:59 PM   #14
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I read on another site that the RV owner made up his own pigtail to correct the reverse polarity problem. He tried to get another site but the campground was booked up on a busy holiday weekend. Better than going home.
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Old 05-24-2015, 10:19 AM   #16
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I just pulled out the 50A to 30A adapter and got my 30A hookup from the 50A plug. The 30A has two prongs (other than the ground). One is not, the other is the neutral. On a 50A, there are two hot legs and the neutral is on the middle prong. Sort of hard to get those reversed and my EMS showed it as being OK.
A 50 amp service to an RV usually utilizes a 4 prong plug, two 120 volt hot legs, a neutral and a ground. The system is still 120 volt, basically two of them and provides a much higher available wattage. (An actual 240 volt supply, like your home stove, is two 120 lines and a ground.) The two 120 volt legs can be reversed with no problem. Reverse polarity RV's run across is at the hookup itself and probably is less likely with the 50 amp service but you never know.
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Old 05-24-2015, 10:42 AM   #17
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You must be useing 30 amp correct? If you are just change the the wires in the Pedestal breaker. If all else fails. People who do not have EMS would never know that without the unit or a meter. That's why it's important to have a system. Your stuff will still work in the trailer but it is very dangerous as others have stated. KY Dan post stated it very well....Good Luck
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Old 05-24-2015, 05:54 PM   #18
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I have had this problem at Sebastian Inlet SP. I reported it and someone came right out. They opened the box to reveal all appeared to be wired correctly. He wouldn't check any further. I plugged in and had no issues. I always test the outlets and have only found two in many many stays at campgrounds. The site I was on at Sebastian has an RV of some type on it every day of the year....just try to reserve one there. If damage had been done someone would have made a stink about it.
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Old 05-25-2015, 05:57 PM   #19
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Originally Posted by edcronin01 View Post
I read on another site that the RV owner made up his own pigtail to correct the reverse polarity problem. He tried to get another site but the campground was booked up on a busy holiday weekend. Better than going home.
This is kind of the answer I was fishing for. Seems that it would be a simple solution to make a dog bone that crosses them back if you didn't want the hassle of dealing with campground staff.
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Old 05-27-2015, 08:56 PM   #20
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Simple to not blow up my coach (campground will not cover you) move to a different site or campground.
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