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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 07-07-2018
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Steelwheels Steelwheels is offline
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Default 50amp on 30amp

I have a 30amp male end cord that has a 50amp female end that goes into my 50amp power my coach plug. I haven’t used this cord before, didn’t even see it till today. Is it ok to use this as long as I manage my power use, one AC at a time.

Nothing to major. Just need to run one AC and my fridge.
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Old 07-07-2018
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Originally Posted by Steelwheels View Post
I have a 30amp male end cord that has a 50amp female end that goes into my 50amp power my coach plug. I haven’t used this cord before, didn’t even see it till today. Is it ok to use this as long as I manage my power use, one AC at a time.

Nothing to major. Just need to run one AC and my fridge.
It should be ok. Wanderlodge use to include a cord like that as part of the standard cord set.
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Old 07-07-2018
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It's usually referred to as a "dog bone". It allows you to use your 50A connector in a 30A receptacle. As you say, just monitor the amp draw on both legs to ensure the total stays less than 30A: one AC is usually OK.It's not a big deal; if you exceed 30A, it will just trip the breaker at the pedestal...a bit of a hassle if you have to stagger out & reset it at 3am.
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Old 07-07-2018
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I was at a state park the past couple days that had two 30amp hookups. I like to use my surge protector but couldn't with the two lines. Is there a way to combine the two plugs into one - use the 50amp surge protector, the run the single 50amp to the coach?
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  #5  
Old 07-07-2018
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Originally Posted by kg4rrx View Post
I was at a state park the past couple days that had two 30amp hookups. I like to use my surge protector but couldn't with the two lines. Is there a way to combine the two plugs into one - use the 50amp surge protector, the run the single 50amp to the coach?
NO! Unless you like smoke. In fact running two 30's has issues. All of the neutral current ends up on only one of the 30 amp circuits and can cause overheating and damage to the shoreline, plugs, outlets and even the coach wiring under heavy load.
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Old 07-07-2018
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Originally Posted by kg4rrx View Post
I was at a state park the past couple days that had two 30amp hookups. I like to use my surge protector but couldn't with the two lines. Is there a way to combine the two plugs into one - use the 50amp surge protector, the run the single 50amp to the coach?
Use your 50 amp cord and a 30-50 dog bone adapter plugged into one and only one 30 amp receptacle.

As Gardner said, plugging into more than one receptacle can cause trouble.
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Old 07-07-2018
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Georgia is the only place I have seen this set up in some state parks. There are 2 separate 30 amp outlets with each on its own breaker. I can only remember using this setup once with my two 30amp cords and inputs on my 88 WB with no problems.
Are you saying that even though some birds are set up for it, the dual 30amp inputs should not be used?
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Old 07-07-2018
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Georgia is the only place I have seen this set up in some state parks. There are 2 separate 30 amp outlets with each on its own breaker. I can only remember using this setup once with my two 30amp cords and inputs on my 88 WB with no problems.
Are you saying that even though some birds are set up for it, the dual 30amp inputs should not be used?

Yes, it can be an issue. This has been talked about several times on the forum. Overloading one of the neutrals will happen when the total current exceeds 30 amps. It is a characteristic of electrical circuits. The neutrals are all tied together back at the campground source and in the coach, so the return current takes the path of least resistance, which will be only one of the two lines. The neutrals in the coach will be tied together unless someone has re-wired it differently to circumvent the issue.

If you check your power usage it is likely it does not normally exceed 30+ amps continuously and might not show up as an issue, but it can be based on your continuous power load.

Now, if the two 30 amp circuits are from opposite phases of the incoming campground power, it will work just fine...long explanation, but unless you can determine this you are at risk.
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Last edited by gcyeaw; 07-07-2018 at 09:02 AM.
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Old 07-07-2018
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Thanks Gardner...Great explanation I'm guessing that's why two 30 amps aren't available on later models. It's easier to use your 50amp cable anyway
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  #10  
Old 07-07-2018
Frank W. Frank W. is offline
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Originally Posted by Steelwheels View Post
I have a 30amp male end cord that has a 50amp female end that goes into my 50amp power my coach plug. I haven’t used this cord before, didn’t even see it till today. Is it ok to use this as long as I manage my power use, one AC at a time.

Nothing to major. Just need to run one AC and my fridge.
We call that a 50/30 cheater cord. Benefits are that it supplies both legs on our era BB with power from one cord from a 30 amp campground outlet. Second + is that a 30 amp extension cord can be used so you can stretch to a distant 30 amp outlet if needed. Can be easier to handle/store than a 50 amp cord too.

The limit is as you noted 30 amps. Typical use is one AC running and one other major appliance at a time. Example: one of your AC units AND ONE these at a time: hot water heater, microwave, engine heater, hair dryer. Typical fridge is not an issue running on gas or electric.
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