What is the appropriate gauge for car jumper cables?

[StHarley]

Car jumper cables with 25 square millimeters of copper wire are most suitable. Because the current is large when starting the engine, the lower the resistance of the jumper cables, the better. Method for using car jumper cables: First, clamp the red wire of the jumper cable onto the red positive terminal of the "dead car's" battery, then clamp the other end of the red wire onto the red positive terminal of the "rescue car's" battery; Clamp both ends of the black wire onto the black negative terminals of the "dead car" and the "rescue car's" batteries; Start the engine of the "rescue car" first; Then start the engine of the "dead car". Precautions for using jumper cables: After successfully starting the engine, the jumper cables must be removed in the correct order; otherwise, it may cause a short circuit. If the dead car still fails to start, check whether there is poor contact in the metal connection parts.