Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-30-2013, 01:17 PM   #15
Senior Member
ernieh's Avatar
Join Date: Jul 2009
Posts: 1,116
Originally Posted by hanko View Post
Actually, I took some time to do some reasearch with my trusty old NEC code book. and infact, a 30 amp rated cord and cap shall not be used in any application rated over 30 amps. Now there is a 10 and 25 ft tap ruel that allows for a hard mechanical connection of an under sized feeder into a larger fused one under certain conditions. So, actually no one including myself gave the right answer. But who cares I do it all the time, I have more adapters and electrical gizmoes than camping world
Actually, you just think that you are wrong. The cord is protected by a 30a breaker on the coach end. If the cord itself shorts, it's toast anyway and the 50a breaker will still trip before any damage is done..

2012 Phaeton 36QSH
2007 Wrangler Toad
ernieh is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-30-2013, 03:35 PM   #16
Senior Member
clyon51's Avatar
Monaco Owners Club
Join Date: Mar 2012
Location: Arizona West RV Park, Yuma, Az
Posts: 4,188
Originally Posted by ernieh View Post
Actually, you just think that you are wrong. The cord is protected by a 30a breaker on the coach end. If the cord itself shorts, it's toast anyway and the 50a breaker will still trip before any damage is done..
Exactly. More damage is done by "Qualified Electricians" working on RVs than your average Rver that understands RV electrical systems. The biggest one is configuring a 30a receptical for someone's home. They take a look at the 120vac 30a plug, then wire the outlet for 240v. Of course the RVer doesn't know the difference and why he called a "Qualified Electrician".

John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
clyon51 is offline   Reply With Quote
Old 06-30-2013, 04:47 PM   #17
Senior Member
wa8yxm's Avatar
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 23,945
Some good some well meaning some misdirection in the above replies

Question: Can you plug a 30 amp rig into a 50 amp outlet using the proper adapter: YES you can many do.

Question: Wont the voltage difference matter:
Answer: No, the adapter takes care of that See technical notes below

Question: Is it not dangerous
Answer: no, you have a 30 amp breaker inside your rv, There is one failure that might cause an overload on the cord but it is theroitical. I have never heard of it actually happening. (Partial short in the cord or before the main breaker in the RV.. In practice that's only possible on a test bench, a real short will trip the 50 amp breaker before the cord is damaged)

Question: Why would someone wish to do this
Answer1: I have been in parks where the 30 amp outlet was kind of nasty, the 50's are usually better condition.
Answer2: The plug/socket connection is better.
Answer 3: Though I've never seen one myself. It's possible that a site might only offer 50 amp, no 30 or 20.

Technical notes

All 3 levels, 20, 30 or 50 have a safety ground wire (Green or bare) This wire , in theory, carries NO current (Or rather it should not, if it does there's a problem) So we will ignore it, On your plug it is the "Rounded" pin.

50 amp service has 4 wires, the ground described above and 3 flat pins


The voltage between L-1 and L-2 in a properly wired park is 240 volts.. The voltage between either L-1 or L-2 and NEUTRAL is half that or 120 volts.. Just what you need.

The dog bone adapter picks off just one leg (L-1 or L-2 L stands for Leg or Line we usually say Leg) and the neutral it ignores the other one completly.. Save for one dual 30 amp to fifty adapter (50 amp plug 2 30 amp outlets) that puts one leg on each 30 amp.

30 amp servce has 3 wires, The ground

One of the legs
And neutral

SO it' is 120 volts

In a triple box (20-30-50 amp) the same wires that feed the 50, feed the 30. and 20,, Just one leg feeds the 30 and depending on who made the box it either also feeds the 20, or the other leg does.

Home is where I park it!
wa8yxm is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:20 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.