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Old 09-07-2016, 10:37 PM   #1
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30 or 50 amp?

We recently purchased a new 27rkss and absolutely love it! During our PDI the tech said that even though it is a 30 amp unit we should always use an adapter and plug into 50 amp service if available. After the PDI the service manager recommend the same thing. I haven't been able to find this information anywhere else, what are your thoughts? Any pros and cons to doing this?
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Old 09-07-2016, 10:50 PM   #2
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Yes. You can use an adapter to connect to 50amp service if needed. No issues.


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Old 09-07-2016, 10:52 PM   #3
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Yes. You can use an adapter to connect to 50amp service if needed. No issues.


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I understand no issues if needed, I guess my question is is there any benefit to doing it if I don't have to?
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Old 09-07-2016, 10:52 PM   #4
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I've done it with an adapter because it was only 50 amp. I have never heard of always doing it. Maybe I'm missing something?
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Old 09-07-2016, 11:09 PM   #5
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IMHO, I think what he was saying was... "Possible trouble with the campground electrical post"

The initial logic is that the 30A plug is the most common and gets worn out more that the 50A. Worn electrical connections can cause problems for your unit.

Invest in electrical protection, not just a surge guard.

I have a 30A TT and a commonly called "dogbone connector". It is a short thick extension cord that plugs into the female 50A plug on the the post with a 30A female connector for my TT cord. I use it when stuck at a 50A only site or when there is trouble with the electrical service. Troubles can happen at a campground that is packed during the hot summer and people are taxing the electrical grid running ACs.

If you have troubles with the 50A, move... Remember a surge guard will not warn you of all electrical troubles and may not not protect you from them.

I know others here can say this better and in more detail than I.

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Old 09-08-2016, 09:32 AM   #6
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Actually, If your RV is set up for 30A, you will get slightly more power if you use 30A service compared with 50A plus adapter.

30A service comes in on 1 phase meaning a single wire carries the entire load.

50A service uses 2 phases meaning you get (2) 25A wires.

When you use a 30A to 50A adapter, you only connect to one of the phases meaning all you will get is 25A.
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Old 09-08-2016, 09:39 AM   #7
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Quote:
Originally Posted by timfromma View Post
Actually, If your RV is set up for 30A, you will get slightly more power if you use 30A service compared with 50A plus adapter.

30A service comes in on 1 phase meaning a single wire carries the entire load.

50A service uses 2 phases meaning you get (2) 25A wires.

When you use a 30A to 50A adapter, you only connect to one of the phases meaning all you will get is 25A.
Tim, actually a 50 amp service is two legs of 120 volt, each at 50 amps (100 amps total).

You are correct that the adapter only connects to one leg, but this leg is 50 amps (not 25).

The 50 amp split phase 120/240 volt service is actually one of the most common misunderstood things, and here are some better links to help explain it.

Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp

RV Electric

and a schematic:

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Old 09-08-2016, 09:43 AM   #8
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Good info, I never knew this. I've only carried my adapter around in case 30A wasn't available. Now I'll actually use the darn thing!
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Old 09-08-2016, 09:58 AM   #9
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also a 50 amp site usually cost more per day than a 30 amp site.....FYI
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Old 09-08-2016, 10:04 AM   #10
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I use the 50 to 30 amp pigtail whenever I can. I only use the 30 amp plug if 50 amp isn't available.

I'm not looking for more power, but the 50 amp pedestal receptacle is usually less used and abused than the 30 amp one is.
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