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hugo7
gbj_tester
There's an insulation voltage rating (300V) and a maximum temperature (105°C conductor temp, although you don't want to run anywhere near that on a device you're going to handle). ANSI is a trade body certification, UL is underwriters' laboratory certification to satisfy your insurer. If you make a longer extension, you want thicker wire to keep the voltage drop constant, in theory doubling the length requires doubling the cross section but you'll want to do maths based on the actual charging current and permissible voltage drop to make sure you have the right wire.