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Old 03-18-2015, 11:54 AM   #15
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You must have 4 conductors for the 50amp.
The black is ONE "leg". The red is ONE "leg". The white is "neutral" for BOTH LEGS! The Green is "ground" and is SEPARATE from the "neutral" on RVs!!!!!!!

As mentioned above, do NOT "bond" /connect the White and Green. Do not tie in to the "bonding lug"
Inside the breaker box or anywhere else. This will trigger the "GFCI" if you have one (recommended).

You then must install a "220" breaker box (sub panel). Then rewire the box so "loads" are split across the "legs" of the Black and Red conductors.

I have posts here of my rewire. PM me or search.
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Old 03-18-2015, 12:45 PM   #16
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I purchased the same 30 amp cord as Jammer. It is a great alternative to dealing with the 50 amp stock cord until it is needed.
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Old 03-18-2015, 12:47 PM   #17
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Originally Posted by Jammer View Post
For those of you geeking out on this thread, some clarifications.

Flexible cord (type SOOW, SJOOW and so on) does not come in "with ground" or "without ground" forms. The ground wire is part of the conductor count. So 10/3 will have two current-carrying conductors (a black one for "hot" and a white one for "neutral") and one (green) ground conductor.

The "with ground" nomenclature is only used on building wiring -- type UF, type NM, and so on.

30a RV service requires 10 gauge cable with hot, neutral, and ground wires, so 10/3 is the applicable designation.

50a RV service officially requires 6 gauge cable with two hot, one neutral, and one ground wire, so 6/4 is the applicable designation.

All RV service is single phase.

One possibility for making the cable more manageable is to use 8 gauge cable, which has a capacity of 40 amps per leg. You would have to make up your own cable set if doing this, and it would be prudent to reduce the main breaker size from 50 amps to 40 amps. It is nearly impossible to exceed a 40 amp draw on either of the two hot legs, with an Airstream, while on 50a service.
I'll see your geek and raise you a half geek. RV/mobile home cords can also be 6/3 + 8/1, where the 8 AWG is the ground. Doesn't make it any lighter though.
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Old 03-20-2015, 11:16 AM   #18
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I purchased a Marinco Park Power cord. They are available on Amazon. They are definately more flexible in cold weather. You will have to change the black threaded locking ring. The cord comes with both rings. I considered the cord Jammer suggests. It is a good option.
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Old 03-20-2015, 01:54 PM   #19
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Number of wires has nothing to do with voltage, only with phases. Single-phase service is three wires. Three-phase service is four wires. Even at 120v.
Not trying to start an argument here because this has been covered before, but 50Amp RV service is not Three-phase, but split phase 240VAC.

It is used, however within most coaches, and all Airstreams that I know of, as two (2) 120VAC "legs". Some of the larger motorhomes that have washers and dryers use 240 for the dryer as I understand.

True three phase power has three hot legs.
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Old 03-20-2015, 02:34 PM   #20
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Which 50/30 Power Chord?

I have located two power chords which go from 50 Amp female to 30 Amp male. These are the ParkPower by Marinco mentioned elsewhere, and the Conntek 14435 -25'. They appear to be similar, but the Marinco chord is $44.00 more than the Conntek. Has anyone used the Conntek? Is the Marinco worth the extra money?
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Old 03-20-2015, 04:28 PM   #21
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I can only say that Marinco makes a better product than Furrion...worth the extra money there.
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Old 03-20-2015, 05:20 PM   #22
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I am out of country now so can not get to an US type RV park. The Airstream internal wiring panels for 50 amp service that I have seen are rated for 240 Vac service as there are two legs and a 240Vac breaker.

The wiring diagrams for 50 amp service show two load conductors (usually the red and black wires), a neutral which is white and a ground that is either green insulated or bare copper (in cheaper cabling).

Thus the 50 amp cable has four #6 wires whereas the 30 amp cable has three #10 wires, black for power, white for neutral and green insulated or bare copper (in cheaper cabling).

Since many of the big motor homes have 240Vac power requirements, the outlets at trailer parks are providing 50 amp 240Vac power. Since Airstream only installs 120Vac equipment, one does not see a two pole breaker in their panel. If both power wires were of the same phase, one could generate a magnetic field that would overheat the cable or conduit (been there and done that on 600 amp 240Vac service).

The insulation on the commercial RV power cords is much more resistant to weather, abrasion, and general wear and tear than the rubber SO cord's insulation.

In my opinion, power cords are not a good part of the RV experience to cut cost corners on.
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Old 03-21-2015, 07:13 PM   #23
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Jammer...I have a 50amp inlet on my Stream. If I understand you correctly on one of your above posts I can get a 30amp cord that will plug into shore power and also plug into my male 50amp plug on the trailer. This is what I need to do. No other adapters are necessary?
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Old 03-21-2015, 08:59 PM   #24
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Use a standard 30A shore cord and get a Marinco 50A to 30A adapter ton


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Old 03-21-2015, 09:01 PM   #25
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Love messaging on phones!!!!!! NOT!!

Get a Marinco 50A to 30A adapter that lugs into your trailer outlet. Then use a standard 30A shore cord to the power post.


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Old 03-22-2015, 12:53 AM   #26
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The 30 amp conversion cord applies the 110Vac 30 amp power to both poles of the 50 amp 240Vac inlet socket on the trailer. Thus you have 3,600 watts (30 amps x 120Vac) of power to spread over the air conditioner, water heater , refrigerator, or microwave. Not all can be operational at the same time.

The 50 amp cord is capable of providing 12,000 watts of power (50 amps x 2 poles x 120Vac) which allows unlimited use of all stuff installed by Airstream at any time.
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Old 03-22-2015, 05:57 AM   #27
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30 Amp "Lighter" Cord for 50 Amp male on Airstream

To have a "lighter cord" specifically when using a generator or if only 30 Amp service is available, I spliced a 50 Amp plug onto the end of a 30 Amp cord. Here is what i see when connected to 30 Amps, or when connected to my 4,000 watt generator:


Airstream_50_Amp_Receptacle to 30_Amp_Cord.001 by Fantinesvoice.com, on Flickr

And, this all works well, and when running off the generator will drive one A/C unit (Not two) but will not consistently run the heat pump. It cut out after about ten minutes, and suggests the heat pump drew too much current. However, I would not be using the heat pump when on a generator so this is not an issue.

The point is, a 30 Amp cord is much easier to move about than a 50 Amp....
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Old 03-22-2015, 07:41 AM   #28
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Originally Posted by 1Boyscout View Post
Where can you find a power cord for my 2015 Intl Serenity 28 that is more flexible and not so heavy?
Can't help with the weight question, but I have a black cable and yellow cable Marinco 30A cord, the yellow is a lot more flexible than the black one.

Maybe get a shorter cord or make yours shorter if your common hookup allows it, less cord length = less weight.
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