Quote:
Originally Posted by Chance
The reason is that the adapter shares the same common in the 50-Amp RV shore line (power cord) so the 30 Amp can go down one leg, and the 15/20 Amp can go down the other leg. However, when the (up to) 45~50 Amps returns combined down a single wire (the common), there’s no way to split the current “exactly” at the adapter between the 30A and 15/20A outlets so that the GFIC protected breaker doesn’t trip.
That’s all assuming that the 30A and 15/20A are all on same phase (an assumption made in posts above that’s not a given). In event that 30A and 15/20A are wired in pedestal to separate phases, the current imbalance coming back on the neutral will be even worse. Not that it makes a practical difference because the GFIC should trip either way when it senses an imbalance of a small fraction of one Amp.
Let me know if a numerical example would help clarify this.
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Why would they NOT be on the same phase on a 120 VAC only pedestal? If they had run 240 VAC to the pedestal they could have a 50 Amp plug.
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