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Old 10-25-2012, 04:03 PM   #29
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Thanks Jammer. Like I said, I've never used the 50 amp source. Seen the outlet in panels at CG, but didn't pay that much attention.
My guess would be if that the big rigs which require 50 amps went to a place that only had 30 amp and used an adaptor would only be able to use one A/C unit. Again, it's only a guess, since my rig is set up for 30 amps.
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Old 10-25-2012, 04:17 PM   #30
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As stated above. An open neutral can be as much of a shock hazard as a hot wire. When a neutral is open, the voltage "stands" at the open connection. If you were to get between the open neutral and the point at which it connects to the neutral buss or earth ground, you would get shocked. If the open neutral wire were to come in contact with the trailer chassis and the chassis was not properly grounded. The trailer would become a shock hazard.
Of course the hot leg to the device would have to be powered. ie the switch closed to a light fixture etc..
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Old 10-25-2012, 05:10 PM   #31
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nomenclature

one of the problems faced by anyone doing electrical work is the decades old usage of the word "ground." Today, there is "earth ground", a "multi-grounded neutral", a "grounding conductor", a conductor "bonded" to a "grounding conductor" or "grounding lug (connector)". My 1985 Airstream had a common neutral and grounding conductor bar. My 2000 has two separate bars; one for neutral conductors and one for grounding conductors-the grounding conductors and the neutral should be entirely separate. When connected to an RV park's pedestal, the RV receives a connection to earth ground via the park's AC system. If a separately derived prime source is used (a generator) then said source should have a driven rod earth ground connection, and the here-to-fore mentioned "sub-panel" in the RV now becomes a main service panel and the neutral of said panel should be bonded to the grounding bar within the panel. Now are you confused?
In DC systems, neither of the two leads required to operate a load are ground conductors, grounding conductors or bonded conductors. There is a battery lead, and a battery return lead. In sophisticated DC circuitry, there is a 3rd conductor which is indeed, a grounding conductor.

The confusion stems from the old(er) usage of 2 wire 120VAC circuitry & 3 wire 240VAC single phase circuitry, and 2 wire dc circuitry. Today, up to date facilities utilize 3 wire 120VAC circuits and 4 wire 240VAC single phase circuitry as well as 3 wire DC circuitry. AND, the extra conductor is a "grounding conductor" not "ground".

These terms (nomenclature) are found in article 100-Definitions of the 2011 National Electrical Code. The term "multi-grounded Neutral" is a Utility Power Source term used to define the neutral conductor in the Utility transmission systems.
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Old 10-25-2012, 06:55 PM   #32
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To sum it all up, for those of us still confused, can anyone put up a diagram of the correct wiring?
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Old 10-25-2012, 07:49 PM   #33
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Just separate the ground and neutral buss'. Then connect the ground buss to the chassis with at least a #6 wire. Do Not connect the neutral buss to the ground buss or to the chassis.
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Old 10-25-2012, 08:08 PM   #34
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OK, here's a picture. The line (red and black) should come in on a 240V bridged circuit as the main breaker (you can keep it on the bus bars, but this gives a bit more protection).


The neutral (white) connects to the "floating" bar, and the ground (green) connects to the bar that is bonded to the panel.
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Old 10-25-2012, 08:23 PM   #35
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Ok here is my version. In actuality the 50A breaker is installed in the breaker box and the power comes in with a different hot wire on each pole.

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