3 ms·
> Yes, you don't want 5V power lines in your walls, but 150V DC would still be more efficient for most devices than 120V AC. Arcing can become a hazard with la
by flyinghamster 4y ago
> Yes, you don't want 5V power lines in your walls, but 150V DC would still be more efficient for most devices than 120V AC.
Arcing can become a hazard with large-scale DC power distribution. Old American wall switches often had ratings for both AC and DC service, and the DC current rating was much lower due to arcing. An AC arc self-extinguishes 60 (or 50) times a second, but DC doesn't offer that luxury.
Even 48V can pack a wallop; I've read accounts of wrenches being vaporized when dropped onto bus bars in telco installations.