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Old 05-14-2016, 10:04 PM   #15
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Just an aside to your 30A RV; NEVER plug your RV into a 3-prong home electric dryer receptacle! It is 220VAC on that one leg. You will ruin your RV electrics, at least the majority of it.
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Old 05-14-2016, 10:44 PM   #16
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I am assuming that he is going to use a 30 amp power cord and put a 50 amp plug on the end of it. I for one never ever advocate putting a 30 amp cord or service on 50 amp breaker. You should never have a breaker that will handle more current than the wiring that is attached to it. It is dangerous and a possible fire hazard.
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Old 05-15-2016, 02:33 AM   #17
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Quote:
Originally Posted by Ray,IN View Post
Just an aside to your 30A RV; NEVER plug your RV into a 3-prong home electric dryer receptacle! It is 220VAC on that one leg. You will ruin your RV electrics, at least the majority of it.

Ray, you a right and wrong. Yes it will ruin lots of things in your RV, but there is not a hot leg with 220. There are 2 hot legs out of phase instead of one hot and one neutral. If you test from the ground to either hot leg you should get 120 and across the two hots, 240.


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Old 05-15-2016, 05:41 AM   #18
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Ray, you a right and wrong. Yes it will ruin lots of things in your RV, but there is not a hot leg with 220. There are 2 hot legs out of phase instead of one hot and one neutral. If you test from the ground to either hot leg you should get 120 and across the two hots, 240.


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Thanks for catching my mistake. That's what I get for overthinking.

gemini5362, It's perfectly OK to run 30A circuit from a 50A breaker when the 30A circuit is protected by a 30A breaker, which is true in this instance. It's no different than your house attached to the power grid.
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Old 05-15-2016, 06:35 PM   #19
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Originally Posted by gemini5362 View Post
I am assuming that he is going to use a 30 amp power cord and put a 50 amp plug on the end of it. I for one never ever advocate putting a 30 amp cord or service on 50 amp breaker. You should never have a breaker that will handle more current than the wiring that is attached to it. It is dangerous and a possible fire hazard.
By that thinking one should never plug a phone charger in to a standard wall outlet - the outlet is protected by a 15A breaker, but the charger is only 1A or so.
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