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    The fire-hazard danger caused by over-heating the usb cable (or the charger itself since that has top deliver MORE power than it is design for if the extension USB cable happens to be an electrial bottleneck) is way worse than a 10 foot regular mains extension cord. USB cables usually don't have any useful information on the packaging to indicate whether they are safe to use for this.
    – Tonny
    Commented May 7, 2023 at 10:59
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    While diy.se would tell you off for using permanent extension cords, I think that's mostly because of cables melting from kW loads, while 65W on the mains side even at 120V is only half an amp (and even less in 230V territories) – doesn't sound like a fire risk even with the most garbage extension cords. Whereas the same 65W at USB-C voltages would be quite a few amps... (I am not an electrician, however.) Commented May 7, 2023 at 11:00
  • I have used power bars very safely and added that note to my post.
    – anon
    Commented May 7, 2023 at 13:14