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Ask the Experts: Why is the earth wire thicker than the rest of the others on automobiles? | NassauNationalCable

Ask the Experts: Why is the earth wire thicker than the rest of the others on automobiles?


  • The earth/ground wire is usually thicker for all applications, not just vehicles. The purpose of the ground wire is to protect the electric circuit from electric shock and possible fires. Is thickness offers lower electrical resistance, allowing it to handle fault currents without overheating, this prevents electric shocks, fire hazards, and potential damage to sensitive electronics.

    We recommend you to read What is the purpose of a ground wire.



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