Is any USB-C charger SAFE to use on any USB-C device ?

[BrightShadowDK]

My son just bought the "samsung galaxy A8" and i has a "acer chromebook spin 11" wich is the only USB type C charger i got at my place..
is it safe to use a charger that delivers 5V - 9V - 15V og 20V ?

I know that charging a 1A-2A device on a 3A charger is not a problem, as the device only takes what it needs..

 

But how is the voltage regulated ? 

many devices i actively switching between 110V AC and 220VAC !

and it should not be possible to plug in an USB C standard devices, and kill them when the plug fits !?

i hope someone has some ironcloud facts.. ? 

[themctipers]

his phone has it's own power brick that delivers enough power for the phone, and it also comes with a charging cable (probably type c to type c, could be type a to type c)

[BrightShadowDK]

You dont seem to get my point: his charger is at his mom´s place, so he needs to use an other and just wants to know if he can use any usb-c charger.. no matter who he visits.. 

[tikker]

USB-C should have power negotiation: https://electronics.stackexchange.com/questions/159552/how-does-a-usb-c-port-provide-the-power-to-charge-laptops

So yes, the charger would be safe to use.

[BrightShadowDK]

Thank you very much it makes sense and is backed up by documentation..