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DC Cable Size question

Discussion in 'General Electronics Discussion' started by Quintrex4, Oct 24, 2014.

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  1. Quintrex4

    Quintrex4

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    Oct 17, 2014
    Last edited: Oct 24, 2014
  2. hevans1944

    hevans1944 Hop - AC8NS

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    It depends on how much resistance 22.9 m of cable has. What the heck is "bi-metal" speaker wire? Copper-clad aluminum perhaps? I would use 18 AWG copper zip cord.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    OK, first thing, is it 14 strands per conductor, or 7 per conductor?

    Let's assume it's 7. So the cross-section is 7 * 0.16 = 1.1mm^2 so the effective diameter is about 1.2mm

    The resistance of this is probably something like 0.017 ohms per metre. The total length is about 46m, so the resistance is around 0.78 ohms.

    At 0.16A, the voltage drop will be 0.13V. That's probably not significant.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Good point. I assumed copper.
     
  5. Quintrex4

    Quintrex4

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    Oct 17, 2014
    Great! Running off limited information from the suppliers site. 0.13V drop is insignificant for what I need it for.

    Thanks for your help.
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    That assumes it's copper. For aluminium, the resistance is just under double copper's.

    The voltage drop will probably still be under 1/4 of a volt.
     
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