Dfb what do you me mean? I think you have that backwards. 50 amp going to a 30 amp could over heat the wiring because there is the potential for to much current. You can just about alway oversize wire and run less amperage with no problems. Kind of like plugging your 50 amp cord into an 30 amp adapter and only drawing 30 amps through the cord. Usually you go to higher voltage to run more power through smaller wire. That is why the transmission lines are such high voltage and use fairly small wire.
Tom Marty
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