Comment on Why is daisychaining multiple extension cords considered unsafe, even if only done to the length of a standard cable?

• gazter@aussie.zone ⁨1⁩ ⁨week⁩ ago

  Not sure if you’ve ever used fuse wire before. It’s what was used before capsule fuses and breakers. Essentially, if too much current goes through it, it will melt, breaking the circuit as protection. The thicker the fuse wire, the more current it can pass through without melting. The length of the wire doesn’t come into it. 1cm of 10 amp fuse wire will melt at the same current as 1 meter of 10 amp fuse wire.

  source

  • uis@lemm.ee ⁨1⁩ ⁨week⁩ ago

    Yes, maximum carried current is indeed invariant of length. I explained math behind it in lemm.ee/comment/17115060

    source

    • gazter@aussie.zone ⁨1⁩ ⁨week⁩ ago

      We may be discussing slightly different things here, I’m not sure if I follow the application of your math in this context.

      My point is that a thinner wire will get much hotter than a thicker wire, given the same amount of current. Is this not the case?

      source

      • uis@lemm.ee ⁨1⁩ ⁨week⁩ ago

        Correct. And temperature does not depend on length. We already said it.

        source