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Old 11-22-2017, 07:00 PM   #1
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100 amp hookups?

There is a big controversy going on in some Facebook RV groups about 50 amp electric plugs at RV parks. Will they put out 50 amps to each leg at the same time so that they are actually 100 amp hookups Does anyone know for sure
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Old 11-22-2017, 07:03 PM   #2
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100 amp hookups?

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Originally Posted by RV Vagabond View Post
There is a big controversy going on in some Facebook RV groups about 50 amp electric plugs at RV parks. Will they put out 50 amps to each leg at the same time so that they are actually 100 amp hookups Does anyone know for sure


Yes you have 50 amps per leg or 12,000 watts available vs 30 amp which is one leg at 30 amps or 3,600 Watts.
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Old 11-22-2017, 07:25 PM   #3
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There is a big controversy going on in some Facebook RV groups about 50 amp electric plugs at RV parks. Will they put out 50 amps to each leg at the same time so that they are actually 100 amp hookups Does anyone know for sure
50 Amps per leg for a total of 100 Amps.....and that's where to put your money on the bet. Each leg has the ability to provide 50 amps at 120 volts for a total of 12K watts. It is the same type system that you house has, except the wire size and the amperage is less for the RV system. And BTW, there is absolutely NOTHING controversial about it.....it is strictly facts....nothing more nothing less, so go collect you money if you bet with what is the facts.
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Old 11-23-2017, 04:04 AM   #4
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Beware the wolf in sheeps clothing. Should be, could be, oughta be!
Yes, 4 pins is standard for 50amp service (100amp total) but without testing you cannot be sure the pedestal is wired correctly.
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Old 11-23-2017, 04:53 AM   #5
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Don't know why this would be a big contraversary...
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Old 11-23-2017, 05:02 AM   #6
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Show them this article.

https://www.rvtechmag.com/electrical/chapter3.php
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Old 11-23-2017, 05:03 AM   #7
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check out the link below:

http://www.myrv.us/Imgs/PDF/50-amp%20Service.pdf

It shows the wiring for a correctly wired "50" amp RV plug. So you see that you have two legs of 120 volt, each of 50 amps. Each leg is out of phase with the other. If you were to combine them, you would get 240 volts.

Where can I get in on the bet?!?
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Old 11-23-2017, 06:06 AM   #8
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Sounds to me like there was a little too much beer circulating and everyone forgot why they were camping. ( relaxation vs a controversy )
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Old 11-23-2017, 06:18 AM   #9
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Wow--another 50 amp RV question--who would of thunk????? Happy Thanksgiving everyone!
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Old 11-23-2017, 06:21 AM   #10
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They are 50 amps at 240 volts divided into two 50 amp 120 volt legs.

The proper description is 50 amps

But some people (mostly salesmen) will say "100" because there are two legs. But the proper description is 50 amps.

NOTE IF you measure amprage, with FULL LOAD. no wire will carry more than 50 amps. IF one does. Click goes the breaker .... OR.... In some cases. the park cheated on the wiring. (in which case the neutral can be seriously overloaded)
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Old 11-23-2017, 06:24 AM   #11
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can`t make this stuff up

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Originally Posted by vsheetz View Post
Don't know why this would be a big contraversary...
I made an absolute pile of money off people that were mystified by electricity. It`s simple, you can`t see volts and amps so they can`t really understand how it works and they think it will kill you every time. Master Electrician 15 years
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Old 11-23-2017, 06:26 AM   #12
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If you are asking an electrician to install an outlet. It is a 50Amp service.

If you looked at the load center in your house and the Main breaker is 200A...you do not call it a 400A service.

Sometime in the past...somebody in RV world..started calling it 100A to help people compare the power to 30A. If the ends justify the means...I guess it's all good. But it does remind me of a Steve Martin skit...

"Wanna be mean to a kid? Teach him to talk wrong..." for those out there that remember the SNL skit...


If you want to purchase a Receptacle...please don't search for 100A.

https://www.amazon.com/gp/aw/d/B0000...SjL&ref=plSrch
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Old 11-23-2017, 01:11 PM   #13
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Three years ago we attended an FMCA Rally in Redmond, Oregon. One of the seminars was on coach care. An employee of a local repair facility was doing the seminar. A few minutes into his seminar, he got into a discussion with a couple of the attendees, telling them that 50 amp outlets only provide 50 amps of power. He was clueless on how coach electrical works. Many of us got up and left, as things went downhill from there.
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Old 11-23-2017, 01:48 PM   #14
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As was pointed out...Amperage is a measure of current flow...PERIOD.

If you have a clamp meter, you can physically measure the Amperage or current flow. At no time, can you ever tell me that if you hook a clamp meter around the service lines going into the RV...will you EVER, EVER see 100Amps.

With the exception of some really high end coaches with 220V. Appliances...most in the RV industry are wired for 110v service only. The TT-30 receptacle is wired to HOT-NUETRAL-GROUND. It supplies one 30Amp LEG. If you have a NEMA 14-50R receptacle you will have HOT-HOT-NUETRAL-GROUND. There are two (2) Hot LEGS. LEG1 and LEG2. They are each capable of supplying 50 amps. They are 180 degrees out of phase from one another. Thus...it is only 50amps of current...and the Neutral only has to carry the imbalance of the load...since it's NOT a heavy enough gauge to carry 50+50 or 100Amps back to the parks main panel. So instead of saying you have 100 amps...which you do not...you could say you have up to 1.1kVA or 11,000 watts of power available. But 100 amps??? Not the correct useage of the term.

I have been to one park that was improperly wired. They had a TT-30 receptacle wired with #6 wire and protected by a 50A circuitbreaker. This was at a Fairground in Mobile AL. I'm sure the carnival workers love having at least one 50amp service Leg. The problem is...the adapters we use to convert our 50a RV's power cord to a TT-30 receptacle only has 10gauge wire in it. This creates a severe overload hazard...since thier poles 50 a breaker, and our coaches 50 a breaker ...neither would prevent more than 30 amps but less than 50 amps to flow thru our adapter. Which is ONLY rated for 30 amps with 10Gauge wire.

Luckily, our RV has an Energy Management System and detects any single Leg source by default as a 30 amp and sheds loads to prevent going over. So we had some protection afforded us by that system.
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