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Old 08-01-2015, 04:14 PM   #29
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They make both 30 to 50 and 50 to 30 amp adaptors. I carry a slew of adaptors and thru the years used them all.

I camp at my brothers with just a 15amp garage outlet so I even use the 15amp to 30amp then 30amp to 50amp into my trailer. (Note: I do not use the AC).
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Old 08-01-2015, 04:32 PM   #30
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Originally Posted by Bigbird65 View Post
If your trailer pulls 23 amps from a 30 amp outlet it will, using an adapter, pull the same 23 amps from the 50 amp outlet.
I'm not against a 50 to 30 adaptor. Just pointing out the safety issue. If the cord shorts out near the MH, you can now draw 49 amps thru that 30 amp cord without blowing the 50 amp breaker.

To be completely safe the dog bones should have 30 amp fuses or breakers built in. ( Maybe they do )
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Old 08-01-2015, 05:02 PM   #31
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Originally Posted by twinboat View Post
I'm not against a 50 to 30 adaptor. Just pointing out the safety issue. If the cord shorts out near the MH, you can now draw 49 amps thru that 30 amp cord without blowing the 50 amp breaker.

To be completely safe the dog bones should have 30 amp fuses or breakers built in. ( Maybe they do )
The 50 and 30 amp breakers on the pedestal only protect the pedestal wiring and the supply wiring to the pedestal. The main AC breaker in the trailer/MH protects the wiring between the trailer/MH AC inlet and the main breaker. I do not see the safety issue you are talking about. My dogbone is not fused.
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Old 08-01-2015, 06:15 PM   #32
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30amp camper; 50 amp campsite hookup

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Originally Posted by Bigbird65 View Post
The 50 and 30 amp breakers on the pedestal only protect the pedestal wiring and the supply wiring to the pedestal. The main AC breaker in the trailer/MH protects the wiring between the trailer/MH AC inlet and the main breaker. I do not see the safety issue you are talking about. My dogbone is not fused.

The 30 and 50 amp breakers protect anything downstream from the breaker. So if you have a short in your supply cord, the pedestal breaker will trip.
The pedestal wiring upstream of these breakers is not protected by the pedestal breakers but is protected by another breaker at the main distribution panel.
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Old 08-01-2015, 06:58 PM   #33
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The 30 and 50 amp breakers protect anything downstream from the breaker. So if you have a short in your supply cord, the pedestal breaker will trip.
The pedestal wiring upstream of these breakers is not protected by the pedestal breakers but is protected by another breaker at the main distribution panel.
Yes the breaker will trip if you have a short in the RV supply cord but it is not protecting the RV since the short in the cord has already killed the power to the RV. The pedestal breaker trips to protect the upstream supply wiring. The pedestal breaker is not there to protect the RV. The RV has its own breaker for that protection.
The breaker at the main distribution panel that you spoke of only protects the wiring that is supplying that breaker.

Surely we have some real electricians out there who can verify what I am saying.
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Old 08-01-2015, 07:21 PM   #34
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Originally Posted by Bigbird65 View Post
The 50 and 30 amp breakers on the pedestal only protect the pedestal wiring and the supply wiring to the pedestal. The main AC breaker in the trailer/MH protects the wiring between the trailer/MH AC inlet and the main breaker. I do not see the safety issue you are talking about. My dogbone is not fused.

I think we are both correct. My issue is where you stated "The main AC breaker in the trailer/MH protects the wiring between the trailer/MH AC inlet and the main breaker."
The supply cord wiring is only protected by the pedestal breaker. If there is no pedestal breaker, you could wind up with a mess like this.
Click image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1438474866.733586.jpg
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Old 08-01-2015, 07:45 PM   #35
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Originally Posted by Winepress View Post
I think we are both correct. My issue is where you stated "The main AC breaker in the trailer/MH protects the wiring between the trailer/MH AC inlet and the main breaker."
The supply cord wiring is only protected by the pedestal breaker. If there is no pedestal breaker, you could wind up with a mess like this.
Attachment 101802
I guess we will just have to agree to disagree because I still stand behind that statement. The main purpose of a breaker is to protect wiring upstream of the breaker. If by tripping the downstream burning is stopped then that is a good thing. I was a Senior Technician for 33 years before retiring from a large electric utility. I see that I am not going to change any minds on this subject so I'm through trying.
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Old 08-02-2015, 02:04 PM   #36
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Just go to your favorite RV supply (I do not personally like Wal*mart but the do have what you need)

The 50 amp plug has 3 flat blades and one not-flat pin
The 30 amp outlet has 2 flat slots and one round-ish one

Get that adapter and you are good no matter

While you are there get a 30 to 15 amp adapter as well

This has the same outlet as the 30 to 50 (naturally) but the plug end is more like the plug on your coffee pot, television, microwave, or whatever (provided it has a 3-pin plug) and plugs into a standard wall outlet.

I carry a full set of adapter 50-30-15-30-50 and 50-15 to cover not only my current needs but past needs and thus possibly help a neighbor.
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Old 08-02-2015, 02:24 PM   #37
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50a only campgrounds are becoming more common. I've learned to have adapters for everything.
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