How are these wires not shorting?
How are these wires not shorting?
They dont look or feel isolated, like ones inside a headphone cable
They're called enameled cables, they've got a thin layer of insulation which prevents them from rusting or shorting.
I created an account just to answer this. They can short. We had a string of these, and it shorted and nearly caught the tinsel on fire. They weren't man-handled, in fact we were extra-careful with them, because they were so thin and fragile-looking. These are dangerous. Do not use them.
The power supplies feeding these are typically .5A at 5v so they can't draw more than ~2.5w. Is that really enough to generate sufficient heat to start a fire? Maybe if they are wrapped around something incredibly flammable?
Is that really enough to generate sufficient heat to start a fire?
In case of a short circuit, yes, more than sufficient
Welcome
Thank you. :)
There is a nonconductive coating on the wire that also prevents it from oxidizing. The wires can touch, but if the coating isn't scratched it won't short.
Some fine grit sandpaper will reveal the metal so you can solder connections.
will also see it sold as “magnet wire” (for winding your own electromagnets) and the heat from your soldering iron is usually enough to melt through the enamel varnish
That's generally not recommended as a way of stripping them though, since the coating is often made of polyurethanes, which release alkyl isocyanates (highly toxic) when heated strongly. While a small amount in a well-ventilated area might not be enough to give you any problems, if you get too much it is very bad. The organic material will also impact the ability to solder. Better to scrape it off first.
They are all insulated
Yeah, those kinda puzzled me as well. They didn't look like they're varnished, but I suspect I could be wrong about that. After all, they do work, lol 😂.
"Never change something that works"
It's usually a thin resin/epoxy coating so it's transparent and has a similar slick feeling as the metal would. The same coating can go over the leds so it's fully waterproof.