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Which jump lead specification matters most?

  • A.Adequate conductor cross section for the current
  • B.The length of the leads, which must be sufficient to reach between the two vehicles without straining the clamps
  • C.The colour
  • D.The insulation rating, which must exceed the system voltage in order to protect against a shock during the operation

Answer: A

Thin leads drop several volts and cannot deliver the current a starter needs, so cross section is the key specification. Length matters because it adds resistance, which makes the second option a related concern. Twelve volts poses no shock hazard. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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