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Old 01-28-2012, 01:00 PM   #1
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Replacing 50A cord with 30A, Hubbell or Marnico?

I recently purchased a 2011 FR Coachman. It came with the second air option with a 50A cord. I can't see adding the second air and most of the campgrounds around here & my generator are 30A. Would like to buy a smaller/lighter 30A cordset to replace the 50A.

The end that connects to the camper is a twistlock type attachment. Does anyone know if this is a Marnico brand or Hubbell brand connector? I think I read somewhere that these connectors are different and I want to make sure I order something that is compatible. I plan to take a closer look at the 50A cord & connector to see if it is marked with a brand, but it may be a few weeks until I get over to the storage facility & I'd like to get 30A on order asap.

Thanks,
Joe
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Old 01-28-2012, 01:19 PM   #2
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If you change over to 30A you will have the change the attachment at the TT plus you will have to rewire the panel. The 50A has two 120volt lines in it while the 30A has only one 120volt. It is not going to be an easy fix. If you are not handy doing electrical work you should leave it to a person who will do the job right. You should just purchase a 50A to 30A cheater.
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Old 01-28-2012, 02:55 PM   #3
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It is not as simple as rewiring your panel either, without getting into a technical rat hole, think of it this way. A 30 amp implementation has 3 circuits, circuit capacity is defined by the total amount of AMP's that the devices on the circuit require, if you exceed the circuit AMP the breaker trips. So on a 50AMP service you get more circuits that's all, rewiring a 50AMP panel to be serviced from a 30AMP service will cause the breakers to trip constantly depending on what you turn on/off at any given time, the reason for the 50AMP panel is that more circuits were required due to more electrical devices that "may" need to draw current at the same time.
Here is a simple test, get a 20AMP cheater and plug it between your 50Amp cord and a 30AMP service plug, go in camper band begin turning things on, before long the 30amp service panel (where you plugged the cheater in) breaker will trip. What services did you get to run at the same time? Air, Frig, Microwave, how many lights, etc.

To rewire the camper correctly you would have to recalculate the load per circuit and move the end devices and plugs, most likely end up with plugs or lights that would not be on any circuit, or if used when other devices on that circuit were drawing a load the camper circuit breaker would trip.
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Old 01-28-2012, 03:23 PM   #4
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Actually, not trying to convert the trailer to 30A. Basically I am asking about something like the "cheater" adapter mentioned above ... except it's not just the dog bone adapter but instead the whole cord that goes from the trailer receptacle to the campground power box. You can see the Marnico brand at this web site ... 50A to 30A RV Adapter - 25' | Marinco .... basically it's a 25' cheater cord. Just trying to understand if the connection at the trailer is the Marnico type or the Hubbell type, or if it even makes a difference. I didn't want to order the cord above if it is not compatible with the twist-lock connection on the side of the trailer.

Sorry for any confusion & thanks for responding.

Joe
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Old 01-28-2012, 04:35 PM   #5
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Why not just buy the adapter?
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Old 01-28-2012, 04:48 PM   #6
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Quote:
Originally Posted by cfsoistman View Post
Attachment 10107

Why not just buy the adapter?
:


That was my observation as well. Seemed to be too simple so I figured that the OP had another reason for changing the whole thing out.

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Old 01-28-2012, 05:17 PM   #7
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cfsoistman, VTX AL,

The 50A cord is bigger, heavier & I don't need it to run the appliances that I have & I won't need the dog bone adapter. Just would prefer the smaller size/gauge cord for ease of handling and storage. Not a big deal, I know, but just something I want.

Thanks for posting,
Joe
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Old 01-28-2012, 05:22 PM   #8
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Quote:
Originally Posted by dezeldad View Post
cfsoistman, VTX AL,

The 50A cord is bigger, heavier & I don't need it to run the appliances that I have & I won't need the dog bone adapter. Just would prefer the smaller size/gauge cord for ease of handling and storage. Not a big deal, I know, but just something I want.

Thanks for posting,
Joe
Why not just buy a 30 amp extension cord and the adapter. Leave the 50 amp cord in the compartment and run the 30 amp extension cord up into the compartment and plug into the adapter? Store the 30 amp cord wherever it's easy to get to. Just a suggestion!!
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Old 01-29-2012, 02:30 AM   #9
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dezeldad.This info indicates that the 50 amp Marinco and Hubbell use the same twist lock connector.
"The cord is UL and CSA approved so it suits both the U.S. and the Canadian market. This high quality power cord is made with three 6 gauge and one 8 gauge 100% copper wires. The Marinco 50 amp locking connector has a twist-lock connector body and comes with a weather-proof boot with a threaded ring. This locking connector fits all 50 amp Marinco and Hubbell power inlets and is perfect for weather-proof applications. This power cord also comes with a special plug head with build-in flanges on the side. So unlike other power cords out there, you have something to hold onto when trying to unplug this gigantic cord from the power source." This is where I got this info from http://www.adventurerv.net/marine-po...r-p-22804.html

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Old 01-29-2012, 10:55 AM   #10
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Dezeldad,

Hubbell makes Marine systems, those use 63AMP systems not 50AMP and the connections are a different configuration.

You can do what you are asking, however, you will damage your unit over time as as systems will not receive the required draw they were designed for(brown condition). You are will need to wire the 50AMP female end to handle the loss of the phasing that you get in a 50AMP system (the adapters handle this already for you)

Keep this in mind: 30 AMP = 3600 watts of service
50AMP is really 100AMP and = to 12,000 watts of service.

See this link to get a better idea of how 50AMP service really works vs 30AMP:
AC Electricity
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