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02-19-2018, 08:50 PM
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#1
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4 Rivet Member
2011 27 FB International
Tucson
, Arizona
Join Date: Apr 2014
Posts: 258
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Electrical Gurus - 50 to 30 amp dog bones
I have a 50 amp pedestal on my property and when other ASers visit I use a 50 to 30 dog bone.
If I need to remain hooked, or if I have two needy visitors at once, I'm wondering how dangerous, fatal, hair-brained (or what ever term suits your fancy) the following idea is:
The standard 50A pedestal is wired Ground, Hot "A," Common, Hot "B." If I create a "double dog bone" by wiring two 30 A females into one 50 A male, how much trouble am I looking at? I'm looking at Circuit "A" using "Hot A," shared common and shared Ground; and Circuit "B" using "Hot B," shared common and shared ground, realizing that "A" and "B" are 180 degrees out-of-phase. Similar to this:
https://www.amazon.com/Epicord-Adapt...ogbone+adapter
Why won't this work, bearing in mind I don't want to make crispy critters out of my friends?
Your views are appreciated.
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02-20-2018, 07:11 AM
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#2
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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Looks like the female ends are 20 amp.
It would be difficult to run AC's. Other than that, it should work.
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02-20-2018, 07:28 AM
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#3
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Site Team
2002 25' Safari
Dewey
, Arizona
Join Date: Mar 2005
Posts: 15,606
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This is what you want.
https://www.amazon.com/dp/B073WB5LBY...a-350338554146
We used 100+ of these at the Escanaba International Rally last year. Running AC was not a problem.
__________________
Richard
Wally Byam Airstream Club 7513
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02-20-2018, 07:44 AM
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#4
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4 Rivet Member
Currently Looking...
Green Cove Springs
, Florida
Join Date: Oct 2016
Posts: 479
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Quote:
Originally Posted by azflycaster
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Yep, use to carry one of these on my boat. I had two 30 amp inlets on the boat and used one of these to tap the 50 amp outlet at the marina. Worked like a champ for years.
__________________
Breathe In, Breathe Out, Move On
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02-20-2018, 07:48 AM
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#5
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,667
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Quote:
Originally Posted by The Ice Man
I have a 50 amp pedestal on my property and when other ASers visit I use a 50 to 30 dog bone.
If I need to remain hooked, or if I have two needy visitors at once, I'm wondering how dangerous, fatal, hair-brained (or what ever term suits your fancy) the following idea is:
The standard 50A pedestal is wired Ground, Hot "A," Common, Hot "B." If I create a "double dog bone" by wiring two 30 A females into one 50 A male, how much trouble am I looking at? I'm looking at Circuit "A" using "Hot A," shared common and shared Ground; and Circuit "B" using "Hot B," shared common and shared ground, realizing that "A" and "B" are 180 degrees out-of-phase. Similar to this:
https://www.amazon.com/Epicord-Adapt...ogbone+adapter
Why won't this work, bearing in mind I don't want to make crispy critters out of my friends?
Your views are appreciated.
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In essence, that is what happens inside a trailer with 50A service, as long as it doesn't have 240V loads like a home stove or clothes dryer. It should work just fine, but get 30A receptacles, or buy the one suggested by Azflycaster.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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02-20-2018, 09:47 AM
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#6
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4 Rivet Member
2011 27 FB International
Tucson
, Arizona
Join Date: Apr 2014
Posts: 258
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Quote:
Originally Posted by azflycaster
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That's perfect. I thought I had searched Amazon and only found the 20 amp version. That's why I was thinking of making one up. This is ready made and costs less than the components bought individually.
Thanks!
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02-20-2018, 10:46 AM
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#7
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3 Rivet Member
1985 31' Excella
st. Paul
, mn
Join Date: May 2007
Posts: 239
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Bad math , the 1st link gave 2 x 15amp = 30 amp outlets from 1 - 50amp .
The second link 2 x 30amp = 60amp , from 1 x 50 - overloaded by 10 amps .
__________________
85 Excella , 31' , electric brakes , R. twin [ would like it to be a single ] , future upgrades , composting toilet [ replace black water tank with a 2nd fresh ] , solar power , instant hot water heater .
Tow 94 Dodge Ram , 4x4 , Cummins , AT .
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02-20-2018, 11:05 AM
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#8
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,667
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Quote:
Originally Posted by JohnTF
Bad math , the 1st link gave 2 x 15amp = 30 amp outlets from 1 - 50amp .
The second link 2 x 30amp = 60amp , from 1 x 50 - overloaded by 10 amps .
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Nope - Each leg of the 50 amp service is rated at 50 amps.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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02-20-2018, 11:59 AM
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#9
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4 Rivet Member
2019 25' Flying Cloud
Greeneville
, Tennessee
Join Date: Jul 2008
Posts: 436
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Yep
Quote:
Originally Posted by azflycaster
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Right on!
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02-20-2018, 06:07 PM
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#10
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1 Rivet Member
2004 25' International CCD
NEW ORLEANS
, Louisiana
Join Date: Apr 2015
Posts: 9
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Its done all the time, but you should be aware that you and/or your friends won't be properly protected electrically. You'll have a 50AMP breaker protecting a 30 Amp cable. Not really idea or to NEC code. If you swap out the 50Amp double pole breaker with a 30Amp double pole breaker it would be much safer (and meet code).
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02-20-2018, 07:19 PM
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#11
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4 Rivet Member
2022 27' Globetrotter
Asheville
, North Carolina
Join Date: Jan 2017
Posts: 396
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Please read what dfbroussard said again.
The breaker exists to protect the wires. Not the equipment.
If you downsize the wires you need to downsize the breaker.
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02-20-2018, 07:47 PM
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#12
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Site Team
2002 25' Safari
Dewey
, Arizona
Join Date: Mar 2005
Posts: 15,606
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You do have 50 amps available at the pedestal, but the mainline breaker at the trailer is 30 amp.
__________________
Richard
Wally Byam Airstream Club 7513
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02-20-2018, 08:02 PM
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#13
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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There is no protection of wire between the pedestal and the panel inside the trailer.
The breaker in the trailer only protects what is downstream.
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02-20-2018, 08:46 PM
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#14
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Rivet Master
1999 34' Excella
Currently Looking...
Hillsboro
, Texas
Join Date: Feb 2013
Posts: 6,406
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the power is there... why not just add the two 30 amp receptacles? only don't use the 50 if using any 30?
__________________
Peace and Blessings..
Channing
WBCCI# 30676
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02-20-2018, 08:57 PM
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#15
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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He may not have room in the box he has....
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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02-21-2018, 05:50 AM
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#16
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4 Rivet Member
2022 27' Globetrotter
Asheville
, North Carolina
Join Date: Jan 2017
Posts: 396
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Just for fun, check the size of the wire your pedestal was wired with. My RV panel has 50, 30 and 20 options. Could be they sized the wire for more and it’s just the panel that’s restricted.
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02-21-2018, 07:57 AM
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#17
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Rivet Master
2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction
, Arizona
Join Date: Sep 2012
Posts: 6,214
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A RV power panel with 50-30-20 outlets has at least 80 amp wire coming in as the potential maximum load could be 80 amps on one leg and 70 amps on the other.
The 50 amp socket is in reality a 240Vac socket. However, an Airstream treats it like there are two individual 120Vac 50 amp outlets. For convenience, say one is leg A and the other is Leg B. In the typical panel, the 30 amp incoming power would be on Leg A and the 20 amp power would be on Leg B.
Thus if one has maximum load of 50 amps on both lets A and B, then adding a 30 amp load to leg A means the wiring upstream is seeing 80 amp power draw. Leg B is seeing a 70 amp power draw.
Most parks may have these panels wired with 100 amp capacity wiring coming into the box to help with voltage drop over distance.
__________________
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic w/ twin beds, 50 amp service, 1000 watt solar system, Centramatics, Tuson TPMS, 12" disc brakes, 16" tires & wheels
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