Why does the converter/refrigerator have a plug? - Page 3 - Fiberglass RV


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Old 05-01-2012, 11:37 AM   #29
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Originally Posted by sparky1 View Post
White should NEVER be HOT in any way. in a DC circuit.

Black or Red should be From A positive source.(hot) in a DC circuit.
........................................;.
AC circuits are totally Different, consult (National Electrical code).
But it's your trailer, hope you don't destroy it or Hurt your self, RV repair Techs are NOT Certified Electricians.

Sparky,
I'm not sure you meant what you said. In DC circuits the standard convention is black, negative and red, positive, all other colors are also positive.
In house wiring white neutral, all other colors hot.
Travel trailer wiring seems have gone closer to house wiring with white being negative, and all other colors positive and the positive bus being black.

Since the wiring colors are mixed up in trailer wiring as standard DC electronics wiring it would be a good idea to always verify with a Digital MultiMeter (DMM).

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Old 05-01-2012, 12:07 PM   #30
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White should (Never) Have a Positive potential (HOT) it should be used as a Negative or Nutral.

Red or Black Should Be Used as (HOT) Positive potential
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Old 05-01-2012, 12:11 PM   #31
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Originally Posted by Dan Meyer View Post
Good theory, but maybe wrong. In my 2000 Scamp, almost all AC power cables are solid conductor romex wiring.

-- Dan Meyer
Hmmm, I'm surprised to hear that. I don't like working with stiff wires, so I'll keep on using braided wires.




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Old 05-01-2012, 12:23 PM   #32
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from your Power Panel to all Receptacles should be Romex...

!2 volt circuitry totally different
Recrecational Units are covered by National Electrical code starting with article 550.
I will not argue with what it states--do as you please---12 volts DC will not kill you---but 28 volts @ 1/10 of a amp can.under certain instances.
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Old 05-01-2012, 12:36 PM   #33
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Originally Posted by sparky1 View Post
White should (Never) Have a Positive potential (HOT) it should be used as a Negative or Nutral.

Red or Black Should Be Used as (HOT) Positive potential
Here's 3 Bench Top Power Supplies. Look carefully at the color of the connectors and the markings. I can supply a lot more documentation if you.
Sometimes Black is negative... Sometimes Black is hot or positive.

Now go out and lift the hood on your automobile. Look at the cable colors coming off the battery. Now determine which one is positive and which one is negative. Isn't a battery in your automobile DC?
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Old 05-01-2012, 01:21 PM   #34
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Here's 3 Bench Top Power Supplies. Look carefully at the color of the connectors and the markings. I can supply a lot more documentation if you.
Sometimes Black is negative... Sometimes Black is hot or positive.

Now go out and lift the hood on your automobile. Look at the cable colors coming off the battery. Now determine which one is positive and which one is negative. Isn't a battery in your automobile DC?
You are absoluty correct. Red is positive, black is negative in the above mentioned equipment. But not on my Scamp. See http://scamp.n0kfb.org/manual/page15s.gif for the wiring diagram of my 2000 Scamp, as seen in the owners manual.

At work, the equipment I work on uses positive ground. In this equipment the negative leads are marked with either blue or black. The moral of the story: Don't assume anything unless you can live with possibly catastrophic consequences.


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Old 05-01-2012, 02:36 PM   #35
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Originally Posted by Dan Meyer View Post
You are absoluty correct. Red is positive, black is negative in the above mentioned equipment. But not on my Scamp. See http://scamp.n0kfb.org/manual/page15s.gif for the wiring diagram of my 2000 Scamp, as seen in the owners manual.

At work, the equipment I work on uses positive ground. In this equipment the negative leads are marked with either blue or black. The moral of the story: Don't assume anything unless you can live with possibly catastrophic consequences.


-- Dan Meyer
Thank You. That's my point. When wiring is involved always check instead of assuming.
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Old 05-01-2012, 03:29 PM   #36
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It sounds like white for positive is something of a trailer standard, I guess having to do with plug that goes to the vehicle. My trailer would be a real confusion to anyone assuming based on color at this point. I wired new outlets with red + and black -, the main leads are one white to the panel and one red to the converter, black for all major -. The main grounding wire to the frame is green. Two of the new light circuits are brown both ways: 14 ga lamp-type cord, and all the old stuff is white ground and who knows what color +.
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Old 05-01-2012, 04:11 PM   #37
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It sounds like white for positive is something of a trailer standard, I guess having to do with plug that goes to the vehicle. My trailer would be a real confusion to anyone assuming based on color at this point. I wired new outlets with red + and black -, the main leads are one white to the panel and one red to the converter, black for all major -. The main grounding wire to the frame is green. Two of the new light circuits are brown both ways: 14 ga lamp-type cord, and all the old stuff is white ground and who knows what color +.
I believe it's the other way around. Trailer wiring is more like house wiring. White is negative and Black is positive. Hence the confusion.
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Old 05-02-2012, 10:03 AM   #38
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I believe it's the other way around. Trailer wiring is more like house wiring. White is negative and Black is positive. Hence the confusion.
Yeah, I meant white for negative seems to be trailer standard. I think it is probably based on the 7 way trailer plug. I can't see how they came up with that though, since car batteries are always black negative, along with every car stereo I ever installed. If they were copying house wiring, seems like green would be negative. White is neutral and there is no DC neutral. The consistent thing would be to never use white with DC.
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Old 05-02-2012, 10:48 AM   #39
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One part of the NEC requires a service disconnect be provided at a piece of gear. The serviceman can then disconnect power before working on the gear. A plug would provide that disconnect, whereas the hard wiring would not. The code says something about the disconnect being within sight of the gear. Your breaker at the converter will likely be out of sight if the serviceman is working outside the trailer. It is not likely another person would enter the trailer and flip the breaker while the serviceman was working on the gear, but could happen. Usually new receptacles are trouble free until many plug/unplug cycles cause loose contact causing overheating. You should be fine with the plug and receptacle if newer.
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