Electrical folks...wire gauge question.

Discussion in 'Mech Tech' started by Dubs, Aug 13, 2019.

  1. Dubs

    Dubs Sponsor

    If one needed to replace a wire to a coolant temp gauge, would I be right in thinking it would need to be exactly the same gauge wire to ensure a correct reading?
  2. Not really. Unless you went for ridiculously thin wire, the resistance of it would be negligible, especially as the gauge is drawing very little current.
    mikedjames, andyv and Dubs like this.
  3. Dubs

    Dubs Sponsor

    Ok, so if one was to use a slightly heavier gauge, it wouldn't make a noticeable difference?
  4. Unlikely, as the gauge is taking beggar-all current.
    Dubs likes this.
  5. Dubs

    Dubs Sponsor

    Well you learn something every day.

    Cheers! :thumbsup:
  6. Only if it is a digital signal, then it can get lost amongst all those electrons.
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  7. ron


    Think your referring to a thermocouple where the wire is critical
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  8. I believe - maybe @MorkC68 will know - that unless there are environmental factors like heat resistance, you can use normal cable even for a thermocouple.
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  9. Normal cable doesn’t have the correct resistance, for example a K type or an N type need the correct compensating cable from thermocouple to your readout.

    If you mix an N type thermocouple with K type compensating cable you can potentially have a 100 degrees Celsius error (ask me how I know).

    Your readout may be K type, may be N type, either way it will say.

    This link from Omega tells you all abou it.

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