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They are in the same phase thus maxing out the potential allowable current load to the neutral wire, and also, Orville, often times mis-wired park power sources "will work" but still put you in danger of over-heating and melting the neutral in your coach as Tspoon suggested. A perfect example is the mis-wired pedestal I encountered in a park in Florida last winter. Both hot legs in my 50A hookup were in the same phase, thus potentially doubling the allowable load on the neutral. Made them fix it before I would hook up.
Regards,
Jerry
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