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08-15-2018, 09:01 AM
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#1
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Member
Join Date: Jun 2017
Location: Rockwall, TX
Posts: 77
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Wiring diagram?
Can someone provide a wiring diagram for this 50A male to 30A female adapter? I know what it's used for - I just want to see how they connect four pins to three.
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2007 Fleetwood Fiesta LX, 31M; 74,000 miles, Workhorse chassis
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08-15-2018, 09:40 AM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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I haven't seen a diagram , but only one of the legs of the 50 amp side is connected to the 30 amp side , so actually there is more power available to the RV through the adapter than from a 30 amp pedestal plug in ,and they rely on the RV's on board 30 amp circuit breaker to prevent overloads.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-15-2018, 09:58 AM
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#3
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,697
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Yeap, as Skip says. Each of the two hot pins on the 50A male can carry 50A, so just one of them is connected to the 30A hot. The neutral and the ground on the 50A make are connected to the corresponding terminals on the 30A female.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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08-16-2018, 08:58 AM
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#4
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Member
Join Date: Jun 2017
Location: Rockwall, TX
Posts: 77
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So anyone using this adapter is actually plugging into a full 50 amp source and is therefore relying on the coach electrical system to prevent drawing too much current thru the 30A power cord... Sounds potentially dangerous.
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2007 Fleetwood Fiesta LX, 31M; 74,000 miles, Workhorse chassis
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08-16-2018, 09:05 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Quote:
Originally Posted by GNICK
So anyone using this adapter is actually plugging into a full 50 amp source and is therefore relying on the coach electrical system to prevent drawing too much current thru the 30A power cord... Sounds potentially dangerous.
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It's still a 50A "cord".
Here's some good info on this stuff Electrical Adapters
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08-16-2018, 09:39 AM
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#6
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Senior Member
Join Date: Jul 2018
Posts: 4,925
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Quote:
Originally Posted by GNICK
So anyone using this adapter is actually plugging into a full 50 amp source and is therefore relying on the coach electrical system to prevent drawing too much current thru the 30A power cord... Sounds potentially dangerous.
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It is. According to Code it's not permitted as there needs to be a 30 amp breaker or fuse protecting the coach cable on the line (not load) side.
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08-17-2018, 03:14 PM
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#7
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Feb 2000
Location: San Jose, Ca, USA
Posts: 2,698
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Quote:
Originally Posted by Solo_RV_Guy
It is. According to Code it's not permitted as there needs to be a 30 amp breaker or fuse protecting the coach cable on the line (not load) side.
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Can you provide a link to this code? One can plug a 1A appliance into a 15A circuit in the motorhome, with no fuse/breaker on the line side of the cord - the protection is inside the appliance, just as it is in the RV.
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Alan Hepburn - San Jose, Ca
2007 Bounder 35E being pushed by a 2020 Jeep Gladiator Sport S or a 2022 Jeep Wrangler Unlimited (JLU) Sport S
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08-17-2018, 03:32 PM
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#8
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Senior Member
Join Date: Nov 2017
Location: Citra, Florida
Posts: 1,396
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The protection is in the 30 amp breaker inside the pedestal. A 30 amp breaker anywhere in the circuit will protect the circuit just fine. Not to worry.
Code is OK with them and there are thousands and thousands of them in use all over the world I would guess.
Be happy don't worry 
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Good Luck and keep us posted please. "Q"
1999 Newmar, Mountain Aire 3768, V-10, CAI, Headers.
"Spending our kids inheritance one trip at a time"
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08-17-2018, 03:53 PM
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#9
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Senior Member
Monaco Owners Club Winnebago Owners Club
Join Date: Sep 2011
Posts: 7,469
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Is this what you are looking for?
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US Navy Vet, Liberty Tree Member of Oath Keepers, NRA & VFW Life Member, Alaska EMT.
2009 Safari Cheetah 40 SKQ
2009 Winnebago Chalet 231CR
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08-18-2018, 09:16 AM
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#10
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Member
Join Date: Jun 2017
Location: Rockwall, TX
Posts: 77
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Quote:
Originally Posted by CountryB
It's still a 50A "cord".
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I can't tell which cord you're referring to, but my 30A power cable is NOT a 50 amp cord. Nor is the dogbone (I presume). As someone else noted, relying on a downstream 30A breaker is NOT the way the NEC defines protection. If I ever have to use the 50A source, I will take it upon myself to watch the loads.
__________________
2007 Fleetwood Fiesta LX, 31M; 74,000 miles, Workhorse chassis
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08-18-2018, 09:18 AM
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#11
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Member
Join Date: Jun 2017
Location: Rockwall, TX
Posts: 77
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Quote:
Originally Posted by sdennislee
Is this what you are looking for?
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Yes, it is - thank you. I saw that in the link provided earlier. I could have figured that out with my ohmmeter!  but I didn't know before that the 50A outlet is actually TWO separate 50A circuits.
__________________
2007 Fleetwood Fiesta LX, 31M; 74,000 miles, Workhorse chassis
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