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Old 09-06-2021, 08:31 PM   #1
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Cool Too Hot to Handle - RV Power Blowing Breaker on House Circuit

Hi there! We just bought a '97 Rexhall Aerbus that needs a little TLC; got it home to do the work & can't get power connected to run lights, etc (been sitting for a year, so needs at least one chassis battery replacement as well). When we connect the 30 Amp -> 20 Amp adapter to an extension cord running to an exterior outlet on our house, it blows the breaker - the gentleman who sold it to us was having the same problem. Can anyone help me get the lights on in my new roadhouse?
~Sierra
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Old 09-06-2021, 08:45 PM   #2
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Turn off all the breakers in the internal 120V breaker box. Turn them on one at a time until you find the circuit that is tripping the house breaker.
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Old 09-06-2021, 08:56 PM   #3
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That's 30A to 20A adapter. The house breaker is probably only 15A, so could be part of the problem
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Old 09-07-2021, 12:08 AM   #4
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Is it a circuit breaker or GFCI outlet ?

If its a GFCI, you may need to find a non GFCI outlet to plug into.

GFCIs are not overload protection devices, they monitor for current leakage, often unavoidable in many RVs.
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Old 09-07-2021, 09:34 AM   #5
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Another issue is how long is the power cord to the RV. What all else is running on your house circuit. Just the A/C alone will pretty well load up a 15 amp breaker. Add the fridge or the water heater on electric and you will trip circuit breakers.

In short, the breaker in the house sets the maximum amps that can run on that circuit. Too long of a power cord will cause a voltage drop and heating of the cord and plugs.

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Old 09-07-2021, 10:29 AM   #6
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In summary:

GFCI protected circuit?
Too long of extension cord?
Too many items ON inside the RV?
*Amp rating of House Circuit Breaker determines Total amps available


New ideas:
*Bad connection in adapter, extension cord etc (shorts)

Turning off ALL circuit breakers inside the RV Main AC Panel is start
IF House CB trips with ALL CB's OFF then issue is with House outlet, extension cord, adapter, RV power cord, wiring up to the Main AC Panel in RV

Voltmeter...process of elimination
**Previous owner had same issue....RV wiring/Critters chewing on wires
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Old 09-07-2021, 11:14 AM   #7
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Quote:
Originally Posted by twinboat View Post
Is it a circuit breaker or GFCI outlet ?

If its a GFCI, you may need to find a non GFCI outlet to plug into.

GFCIs are not overload protection devices, they monitor for current leakage, often unavoidable in many RVs.

These days, most outdoor outlets are GFCI's. An RV that has the ground and neutral tied together will trip a GFCI outlet when they are plugged into it. RV's are not supposed to have a ground to neutral connection, but many of them do.


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Old 09-09-2021, 05:45 PM   #8
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Quote:
Originally Posted by twinboat View Post
Is it a circuit breaker or GFCI outlet ?
Indeed it was a GFCI outlet - got it running through a window to an interior (non-GFCI) outlet, thank you!
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Old 09-09-2021, 05:53 PM   #9
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Thumbs up

Quote:
Originally Posted by Old-Biscuit View Post
In summary:

GFCI protected circuit?
Too long of extension cord?
Too many items ON inside the RV?
*Amp rating of House Circuit Breaker determines Total amps available


New ideas:
*Bad connection in adapter, extension cord etc (shorts)

Turning off ALL circuit breakers inside the RV Main AC Panel is start
IF House CB trips with ALL CB's OFF then issue is with House outlet, extension cord, adapter, RV power cord, wiring up to the Main AC Panel in RV

Voltmeter...process of elimination
**Previous owner had same issue....RV wiring/Critters chewing on wires
This might seem silly but I really appreciated this summary/step-by-step rundown - thank you so much!
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Old 09-09-2021, 06:01 PM   #10
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Talking Let there be light!

GOT IT - turned off all the internal breakers, connected the RV & tripped the GFIC - moved to a different outlet in the house (non-GFIC), ran an extension cord through the window, and tried internal breakers until I got lights & nothing else - & no trip on the house breaker! Thank you all SO much - I really needed that win today.
~Sierra
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Old 09-09-2021, 06:13 PM   #11
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GOT IT - turned off all the internal breakers, connected the RV & tripped the GFIC - moved to a different outlet in the house (non-GFIC), ran an extension cord through the window, and tried internal breakers until I got lights & nothing else - & no trip on the house breaker! Thank you all SO much - I really needed that win today.
~Sierra

You fixed the symptom but not the cause. The GFCI tripping without any appliances or devices powered up indicates you have a current leak in your shore power cable or plug or transfer switch.
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Old 09-09-2021, 06:23 PM   #12
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Just a hint for future questions, and I'm sure there will be some, be as specific as you can with what happened and post pictures if possible. There's lots and lots of knowledge here, but as with many things in life, communication is very important. Good luck with your rig and don't be shy.
One more tip, create a signature line with your rig year, make and model in it, it helps when you have questions.
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Old 09-20-2021, 08:07 AM   #13
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Testing

Quote:
Originally Posted by arcaguy View Post
One more tip, create a signature line with your rig year, make and model in it, it helps when you have questions.
Did I get it?
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Old 09-20-2021, 02:29 PM   #14
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Quote:
Originally Posted by Snailbus View Post
Did I get it?
You got some of it. We need your engine and chassis information too.
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