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Old 04-06-2012, 12:30 PM   #1
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50 to 30 amp plug

I just got a 5th that i am going to park right by my shed while not in use i would like to have power going to it. The trailer is a 30 amp, but my shed only has a 50 amp right now are those 50 to 30 amp connectors good? Will my trailer try to take more amps then it needs? Its a old prowler. Thanks
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Old 04-06-2012, 01:02 PM   #2
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The adapter will work just fine for you. And no the trailer will not take more than
the 30 amps if that.
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Old 04-06-2012, 01:28 PM   #3
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Hi and welcome to the forum!

Just be sure the 50 amp outlet you have is wired for RV use and not the standard residential usage.

Rick
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Old 04-06-2012, 01:42 PM   #4
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Rick makes a good point the sockets are different
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Old 04-06-2012, 02:22 PM   #5
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Are the actual sockets different or are they just wired differently?

It was my understanding that the male RV plug would fit fine but instead of two 120v legs it would be exposed to a single 240v leg.

My knowledge on this doesn't go very deep but it should be checked out.

Rick
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Old 04-06-2012, 02:30 PM   #6
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What people call a 50 amp plug in the home or shop may not be a 4 wire plug but
a 3 wire and the RV 30 is wired differently it has one 120v and two grounds NOT
two 120v hots and a ground.
If it is a 4 wire no problem BUT if it is a 3 wire bad and fast things will happen.
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Old 04-06-2012, 03:28 PM   #7
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There is a HUGE difference between a three prong 50 amp receptacle found in homes, garages and shops versus a three prong 30 amp receptacle such that you should not get them confused easily as the RV 30 amp receptacle is unique to itself.

Providing that a qualified certified electrician KNOWS exactly what they are doing, a 30 amp RV receptacle can be wired properly in a home. HOWEVER, I did read where one iRV2.com member hired an electrician to wire a 30 amp RV receptacle BUT instead he wired it as a 50 amp 240 VAC and proceeded to fry the customers coach when he plugged in. Now that situation is one VERY BIG reason to have a Progressive Industries EMS unit added to your coach. If he had one of those it would have caught the electricians error BEFORE any damage was done.

Read and save this web site and refer to it often.

RV Electric

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Old 04-06-2012, 05:15 PM   #8
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alright thanks guys.
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Old 04-07-2012, 09:16 AM   #9
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One more question how do you know if its a 50 amp rv plug rather than one that isnt. Its outside by a shed that people use to hook rvs up to so i would assume it is, just want to make sure thanks.
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Old 04-07-2012, 09:33 AM   #10
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If it is a 4 plug female socket. At the top you will have a half moon pin that is ground
straight down on the bottom will be a flat spade that also is a ground .
With a AC volt meter measure those two for no voltage. The flat spades located left and
right are the hot leads. Measure the voltage between them and it should be 230/240
volts. Then measure the left spade voltage to the top pin it should be 120 volts do the same measurement to the bottom spade it also should be 120 volts.
Then measure the right spade to the top and bottom pins as above and it should be
120 volts each measurement.
If this checks out you are ok.
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Old 04-07-2012, 09:45 AM   #11
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Here is a link to documents describing how to install both 30 AMP and 50 AMP services. https://skydrive.live.com/?cid=ae67f...2766057%213455

My guess is the 50 AMP in your house is for a dryer and if you did manage to get plugged into it you would severly damage your RV or perhaps even start a fire. It is probably 240 VAC and your coach is 115 VAC, If you do not understand that last statement or the two documents, hire a pro to set you up.

IF you aren't going go live in the RV while parked in this spot, you do not need a full 30 AMP service 20 or even 15 AMP would be enough to keep the batteries charged and even run a furnace. You just wouldn't be able to run a AC unit or much of anything else together.... ie. the Coffee Maker and Microwave.

Be carefull and safe trips.

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Old 04-08-2012, 05:00 AM   #12
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Quote:
Originally Posted by zachprowler5 View Post
One more question how do you know if its a 50 amp rv plug rather than one that isnt. Its outside by a shed that people use to hook rvs up to so i would assume it is, just want to make sure thanks.
Did you look at the RV Electric link I had posted for you to read a day or two ago? There are photos that show what your normal 50 amp RV receptacles look like as compared to some typical 50 amp household receptacles.

Also, take a VOM and measure the lugs to see what each of them are. The RV Electric article will explain EVERYTHING you need to know and then some about RV Electric.

Take a photo of the receptacle and post it here, then we can tell you what you have.

Dr4Film ----- Richard
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Old 04-08-2012, 01:39 PM   #13
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Quote:
Originally Posted by RickO View Post
Hi and welcome to the forum!

Just be sure the 50 amp outlet you have is wired for RV use and not the standard residential usage.

Rick
In the case of a 50 amp outlet, so long as it is 4 wire,. there is no difference in how it's wired, But if it's 3 wire, you will need to have it re-wired.

And of course if it is not the correct outlet you will have to have the outlet replaced.

50 amp service is 120/240 volt that's two hots, a neutral and a ground,

The ground is the round (or D-or U shaped)
The opposite pin is Neutral


The remaining pins (Either side) are L-1 and L-2, and it don't matter which is which.
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Old 04-08-2012, 01:54 PM   #14
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For the purposes of this discussion Neutral and Ground are the same.
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