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08-25-2013, 02:01 AM
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#1
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Member
Join Date: Oct 2012
Posts: 46
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50 amp male to 30 amp female adapter
Is it safe to plug into a 50 amp plug with an adapter (dog bone) for my 30 amp TT?
Or do I need to put a 30 amp breaker box between the adapter and the TT?
(adapt the adapter )
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Home is where you park it.
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08-25-2013, 05:39 AM
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#2
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Member
Join Date: Mar 2013
Posts: 32
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It's safe.
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08-25-2013, 06:43 AM
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#3
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,960
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Using a properly wired adapter is OK. You can pick them up at Wally World in their RV section.
Here is a link that helps explain how it works:
Using a 50 to 30 Amp RV Power Adapter - RV Basics .com
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A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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08-25-2013, 07:38 AM
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#4
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Senior Member
Join Date: Feb 2012
Posts: 825
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You could fry your 30 amp trailer cord if something happened before your breakers trip in your trailer. If you have a 30 amp surge protector between the 50 amp to 30 amp dog bone and your 30 amp trailer cord that would protect the your cord and the cord to your breaker box. That is the way I would do it to be safe.
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2012 Cedar Creek Silverback 29RE
2011 GMC 2500HD Diesel
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08-25-2013, 07:54 AM
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#5
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by camper1999
You could fry your 30 amp trailer cord if something happened before your breakers trip in your trailer. If you have a 30 amp surge protector between the 50 amp to 30 amp dog bone and your 30 amp trailer cord that would protect the your cord and the cord to your breaker box. That is the way I would do it to be safe.
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How does a surge protector protect a cord from overload?
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08-25-2013, 08:06 AM
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#6
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Senior Member
Join Date: Feb 2012
Posts: 825
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Quote:
Originally Posted by BarryD0706
How does a surge protector protect a cord from overload?
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The good ones monitor not only volts but amp draw also.
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2012 Cedar Creek Silverback 29RE
2011 GMC 2500HD Diesel
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08-25-2013, 08:21 AM
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#7
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by camper1999
The good ones monitor not only volts but amp draw also.
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Could you give me a specific model or brand that you think does that? My Progressive Industries EMS unit does not. In fact, it doesn't even properly display currents above 35 amps on the readout. (But that's a 50-amp EMS.)
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08-25-2013, 08:28 AM
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#8
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Site Team
Join Date: Aug 2012
Location: top side land of Lincoln
Posts: 7,509
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Quote:
Originally Posted by BarryD0706
Could you give me a specific model or brand that you think does that? My Progressive Industries EMS unit does not. In fact, it doesn't even properly display currents above 35 amps on the readout. (But that's a 50-amp EMS.)
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Portable Surge Guards With LCD Display - 30 Amp - TRC 34730-001-LCD - Surge Protectors - Camping World
I plug into the 50 amp with my surge protector.
No problems
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2014 LaCrosse 323RST-TE-C
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Seasonal
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08-25-2013, 08:30 AM
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#9
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Senior Member
Join Date: Feb 2012
Posts: 825
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Quote:
Originally Posted by BarryD0706
Could you give me a specific model or brand that you think does that? My Progressive Industries EMS unit does not. In fact, it doesn't even properly display currents above 35 amps on the readout. (But that's a 50-amp EMS.)
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Pricey but good.....
TRC 30 Amp Portable RV Surge Guard with LCD Display
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2012 Cedar Creek Silverback 29RE
2011 GMC 2500HD Diesel
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08-25-2013, 08:42 AM
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#10
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Thanks guys. I do see that it says they do that, but I think all it means is that they display the amps value. I am going to call TRC on Monday and ask them.
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08-25-2013, 08:43 AM
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#11
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Site Team
Join Date: Aug 2012
Location: top side land of Lincoln
Posts: 7,509
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Quote:
Originally Posted by BarryD0706
Thanks guys. I do see that it says they do that, but I think all it means is that they display the amps value. I am going to call TRC on Monday and ask them.
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volts and amps on mine
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2014 LaCrosse 323RST-TE-C
2009 Chevy 2500HD Z71
Seasonal
Zelda the campin dog
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08-26-2013, 02:50 PM
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#12
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by BarryD0706
Thanks guys. I do see that it says they do that, but I think all it means is that they display the amps value. I am going to call TRC on Monday and ask them.
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I just got off the phone with TRC technical support. While they do "continuously monitor" the "amps" being drawn, all they do with that information is to display it. They will not shut the power down to the output due to high current, which means that a SurgeGuard will not protect your cord from high current.
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08-26-2013, 03:08 PM
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#13
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Site Team
Join Date: Aug 2012
Location: top side land of Lincoln
Posts: 7,509
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Quote:
Originally Posted by BarryD0706
I just got off the phone with TRC technical support. While they do "continuously monitor" the "amps" being drawn, all they do with that information is to display it. They will not shut the power down to the output due to high current, which means that a SurgeGuard will not protect your cord from high current.
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then wouldnt the campers electric equipment be at risk too??
a spike is high currant
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2014 LaCrosse 323RST-TE-C
2009 Chevy 2500HD Z71
Seasonal
Zelda the campin dog
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08-26-2013, 03:28 PM
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#14
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by Platokidd
then wouldnt the campers electric equipment be at risk too??
a spike is high currant
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Sorry, but no, a spike is high voltage (of very short duration). The unit doesn't disconnect the RV's power for a spike. The spike is just dissipated (shorted out) thru the MOV spike suppressors.
A "surge" is a longer-duration change in voltage (much less voltage than a spike), and this is what the unit disconnects the RVs power for.
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08-26-2013, 03:52 PM
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#15
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by BarryD0706
Could you give me a specific model or brand that you think does that? My Progressive Industries EMS unit does not. In fact, it doesn't even properly display currents above 35 amps on the readout. (But that's a 50-amp EMS.)
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Franks Electronics Autotransformer that I use (see my review) has an integral 30 amp breaker on the input side. This prevents passing more than 30 amps INTO the Franks.
The 50 amp Franks has dual "ganged" 50 amp integral breakers.
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2008 GMC Sierra 3000HD Allison Duramax
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08-26-2013, 03:58 PM
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#16
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by Platokidd
then wouldnt the campers electric equipment be at risk too??
a spike is high currant
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I have the 30 amp SG by TRC, It will shut off it your voltage dropped to 108 volts or exceeded 138 volts, Current is the amps drawn has nothing to do with volts. If you exceed 30 amps your trailer breaker will trip at about 32 0r 33 amps. Granted your 50 amp will not trip but the trc will protect from high and low voltage NOT AMPS....
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Concord
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08-26-2013, 04:02 PM
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#17
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by herk7769
Franks Electronics Autotransformer that I use (see my review) has an integral 30 amp breaker on the input side. This prevents passing more than 30 amps INTO the Franks.
The 50 amp Franks has dual "ganged" 50 amp integral breakers.
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Good, there is one! But then your Franks is mounted inside your RV so that 30-amp breaker is pretty close to the 30-amp breaker already in your coach electric panel. In other words, there is still the potential to "melt the cord" if you're plugged into a 50-amp outlet.
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08-26-2013, 04:21 PM
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#18
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by BarryD0706
Good, there is one! But then your Franks is mounted inside your RV so that 30-amp breaker is pretty close to the 30-amp breaker already in your coach electric panel. In other words, there is still the potential to "melt the cord" if you're plugged into a 50-amp outlet.
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I do not understand how you can melt the cord if your 30 amp breaker trips you are not pulling any current at that time, your cord can not melt. I never heard of such a thing. If you over load your house circuit say 15 amps your wire in the wall would not melt it's the same thing. If your breaker in the trailer trips you are not pulling any current but you will still have the potential of voltage to the breaker only not Amps which creates the heat electrical 101. That is what trips the breaker not voltage.
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Coachmen M/H
Concord
2018 / 300 DSC
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08-26-2013, 04:32 PM
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#19
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Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
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Quote:
Originally Posted by gljurczyk
I do not understand how you can melt the cord if your 30 amp breaker trips you are not pulling any current at that time, your cord can not melt. I never heard of such a thing. If you over load your house circuit say 15 amps your wire in the wall would not melt it's the same thing. If your breaker in the trailer trips you are not pulling any current but you will still have the potential of voltage to the breaker only not Amps which creates the heat electrical 101. That is what trips the breaker not voltage.
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We are talking about the case where there is some kind of short (eg, conduction path) somewhere between the 50-amp pedestal plug and the 30-amp breaker in your RV. So for example, you have a cord that plugs in at your RV (not permanently mounted) and something shorts across that cable plug at the RV end. It doesn't matter what's going on with the breaker in your RV. The only other breaker is 50 amps and the 30-amp cord will melt before that 50-amp breaker trips. Does that help?
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08-26-2013, 05:01 PM
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#20
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by BarryD0706
We are talking about the case where there is some kind of short (eg, conduction path) somewhere between the 50-amp pedestal plug and the 30-amp breaker in your RV. So for example, you have a cord that plugs in at your RV (not permanently mounted) and something shorts across that cable plug at the RV end. It doesn't matter what's going on with the breaker in your RV. The only other breaker is 50 amps and the 30-amp cord will melt before that 50-amp breaker trips. Does that help?
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I guess another way to say it, If you connect to a 50 amp supply and transmit power with a 30 amp cord your taking your rv life in your hands. You are relying on an inexpensive, probably Chinese, saftey device to clear in time from fault current or overload. If the Rv breaker fails to open, you have eliminated the correct protection at the pole... Is your insrance paid up?
National Elec Codes mandates the sizes for each customer requirement, not interchangeble.
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