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Old 06-11-2009, 03:33 PM   #1
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Wiring 30 amp receptacle

I'm putting a 30 amp receptacle (power supply) in my garage.

I've installed a new circuit from my breaker box and run my wire.
Now to wire to the receptacle.
I bought the box and receptacle from Tweety's and it was made by
Connecticut-Electric. Problem is, there is no definitive wiring diagram with it. The ground is the only identified prong.
The only difference I can see is a spot of red inside one of the connectors.
(the other is silver)
I would normally assume the red signifies hot. ? Yes?

But I want to be sure before I plug in the trailer.

The RV Dealer, where I bought the trailer, told me that if I looked at the
blade view of the plug, the lower left blade would be my white or neutral.
... and the lower right would be my hot or black.

I also called Connecticut-Electric. They're tech guy told me that as I looked
at the receptacle from a "plug-in" view, the black/hot would be the lower left and the white/neutral would be the lower right.
(he was not aware that there was no wiring diagram in their product)

Well, if both of them are right, everything matches up.

That's IF... I spent all my money on my trailer and really can't afford to be
fixing any silly mistakes. So... how to test it prior to plugging in.

DOES THIS SOUND RIGHT?

I'll plug the cord into the trailer. Then with a voltage tester to measure
ohms resistance, I'll test the prongs of the male end of the cord.
From Ground to one prong = 0 resistance = white or neutral.
From Ground to the other prong = some resistance = hot or black.

Sound correct ???

Any advice here? Thanks.
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Old 06-11-2009, 03:39 PM   #2
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Usually they are color coded. Green is for ground, or the green wire. Silver is for neutral, the white wire. Brass is for hot, or the black wire.
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Old 06-11-2009, 03:40 PM   #3
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There should be a bronze or gold colored screw for the black wire to connect to (the hot one) and a silver screw for the white wire to connect to. The ground prong should have a green screw. If you need me to, I can open up my 30 amp box and take a picture for you.

Chris
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Old 06-11-2009, 03:49 PM   #4
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Here you go:

http://www.dasplace.net/RVWiring/DSC...0AmpSocket.jpg
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Old 06-11-2009, 04:07 PM   #5
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Both screws are silver but the interior of one connection is definitely "brassier" than the other. Thanks for the pic Xsteam. Your photo jives with what the manufacturer told me.
But I'd still like to test before plugging in. (If for no other reason than just learning how to do it)
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Old 06-11-2009, 05:47 PM   #6
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Agood thing to carry is a polarity overload adapter. Some campgrounds are incorrectly wired. jim
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Old 06-11-2009, 06:26 PM   #7
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Electrical Outlet Tester

Do you have a 30 amp plug to 15 amp outlet converter? If yes, then you can go to a hardware store or home depot type store and buy a cheap electrical tester like this one. Get one that has 2 yellow lights and one red one. When you plug it into a 15 or 20 amp outlet, if everything is wired correctly, the two yellow lights come on and the red one stays off. Any other light pattern and something is wrong. The tester gives you an good idea as to what's wired incorrectly. You can use the 30 to 15 amp converter to test any 30 amp outlet. Works well.

Sorry for the fuzzy picture - but you get the idea of what to look for.

Chris
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Old 06-11-2009, 07:18 PM   #8
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Quote:
Originally Posted by BlueBelle View Post
Both screws are silver but the interior of one connection is definitely "brassier" than the other. Thanks for the pic Xsteam. Your photo jives with what the manufacturer told me.
But I'd still like to test before plugging in. (If for no other reason than just learning how to do it)
As you are looking at the plug part (where you plug the RV in), the round terminal in the center is ground, the connector to the right is the black wire, and the connector to the left is the white wire.
Remember:
Black is Hot
White is Not (Neutral)
Green grass grows on the Ground.
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Old 11-03-2015, 09:37 AM   #9
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even the professionals....

I just had a new house built with a 30 amp outdoor receptacle next to the Airstream driveway. Just before finishing the house, I plugged the cord in and BAM! The Surgegard blew up. Turns out the electrician wired it wrong.
He said "well, there were no markings on the receptacle." He replaced
the Surgegard and fixed the wiring. Lucky for him, the Surgegard was only $300. The cost to rewire the trailer would have been more.
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Old 11-03-2015, 12:49 PM   #10
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30 Amp RV outlet (120V) vs 30 Amp House outlet (240V)

Mis-wiring a 120-volt RV outlet with 240-volts | No~Shock~Zone

Hopefully the photos in this article will answer your questions.

Seems that many RV 30 amp services get wired 240V by electricians more familiar with 30 amp outlets for clothes dryers.
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