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Which practice protects a network during welding or jump starting?

  • A.Disconnect the battery and follow the correct sequence
  • B.Connect the welder earth to a module casing, which provides the shortest return path and therefore protects the modules
  • C.Nothing
  • D.Isolate the battery before welding and place the earth clamp close to the work, keeping current out of the harness

Answer: A

Welding current finding a path through the harness destroys modules and transceivers. The last option describes exactly the correct practice, which makes it a correct and more specific version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming what changes and what stays the same is the reliable route through questions of this shape.

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