What is the most suitable size of copper wire for car jumper cables?

[Ella]

25 square millimeters is the most suitable size of copper wire for car jumper cables. Because the current is large when starting the engine, the smaller the resistance of the jumper cables, the better. How to use car jumper cables: First, clamp the red wire of the jumper cable to the red positive terminal of the "rescued car's" battery, then clamp the other end of the red wire to the red positive terminal of the "rescue car's" battery; Clamp both ends of the black wire to the black negative terminals of the "rescued car" and the "rescue car" batteries respectively; Start the engine of the "rescue car" first; Then start the engine of the "rescued 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 rescued car still cannot start, check whether there is poor contact at the metal connection points.

[JudeDella]

I used to frequently help friends jump-start their cars, and every time I had to use jumper cables. The experience I've summarized is that it's best to choose copper wires with a cross-section of at least 6 square millimeters. Car starting currents are extremely high, often reaching hundreds of amps. If the wires are too thin, such as 4 square millimeters, they can overheat and burn out. I once nearly had an accident when the connector melted and sparked. Now I only use thick 8 square millimeter copper wires. Long cables are also not good as they cause voltage drop and make starting difficult; it's recommended to keep them within 2 meters. Additionally, the quality of the clamps shouldn't be overlooked—only pure copper clamps can grip the electrodes tightly and minimize sparking. Store them in a dry place to prevent oxidation and failure. Regularly check the cables for wear to avoid mishaps during emergencies.

[DelKai]

Those familiar with automotive electrical systems know that thicker ignition wires are more reliable. The copper wire cross-section should be at least 6 square millimeters, and for larger vehicles like SUVs, 8 to 10 square millimeters is safer. High current can cause resistance to spike, leading to voltage drops, making starting difficult and increasing the risk of overheating and melting the wire insulation. Don't skimp by using aluminum alloy wires—I've tested them several times, and their performance is poor, prone to oxidation and poor contact. Choose pure copper wires with good insulation materials that are heat and pressure resistant. Shorter lengths are better, around 1.5 meters is ideal. Regularly clean the connectors to ensure conductivity, which can extend the lifespan.

[OAurora]

Safety always comes first, don't cut corners with jumper cables. The minimum should be 6 square millimeter copper wires - thinner ones will rapidly overheat under high current, potentially melting or causing fires. I've read reports about substandard cables causing vehicle fires, which is extremely dangerous. Choose certified cables with slip-resistant, insulated clamps to prevent sparking injuries. Follow the proper sequence when connecting: positive terminal first, then negative - getting the order wrong can cause issues. Don't forget to check the battery condition; if it's too weak, jump-starting may not work. Safety measures are far more important than saving money - lives are at stake.

[DelEdward]

Considering cost-effectiveness, 6 square millimeter copper wire offers the best value. Thicker wires like 10 square millimeter are significantly more expensive and unnecessary for over-specification; thinner ones like 4 square millimeter are prone to damage and frequent replacement, which ends up costing more. After comparing in the market, 6 square millimeter wire is moderately priced, sufficient for regular small cars, and durable for three to five years. Choose mid-range brands with sturdy clamps, avoiding cheap off-brands. Store in a dry and ventilated place to save on maintenance hassles. Test install periodically to ensure reliability in critical moments.