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CD
Despite Steve's insistence there is no current on a live line, it is there. You might also check the pedestal receptacle innards to ensure it isn't corroded which would cause heating of the entire mated plug.
I am not being dismissive of your hypothesis that the cable quality has been changed as that appear to be more often the rule than the exception these days and we would have no way, simply by seeing a UL stds label, it isn't true here. What I do know is that when it happened to an older cable of mine, I did some surgery on it just for interest and it appeared to me upon cursory inspection to be of the same quality as a new cable I chewed up with the tractor. It was clearly the same guage wire but as you point out, the cable plug ends are sealed and not easily inspected so I couldn't draw any conclusion.
Regardless, for any number of reasons, arguable or otherwise, it is prudent to shut off the circuit at the main breaker on shore before disconnecting.
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