Cor van de Water via EV wrote:
Bob, Measure the voltage drop and you know its resistance - that will tell you the gauge. I bought 12 gauge cords after I experienced a 15V drop from a cheap extension cord that not only was running hotter than I felt comfortable with, but wasted power and the drop affected the power available, so I could not charge as fast. The 12 gauge cord hardly has voltage drop, I believe I measured it a around 4 Volts drop at full charging current, for a 100 ft run.
That's good advice. The voltage drop will also tell you if you have a crappy plug or socket.
Note that with the current high price of copper, you will occasionally find "bargain" wire and cords that may be marked "14 gauge" (or whatever) but are actually something smaller!
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