4 ms·

Yes and power negotiation does not protect against improper voltage whatsoever. This wasn't my point, despite me addressing negotiation in another comment.

by junon 5y ago

mlyle 5y ago
> Yes and power negotiation does not protect against improper voltage whatsoever. Oh? Everyone else seems to think the mechanisms are sufficient for safety. > This wasn't my point, despite me addressing negotiation in another comment. I still don't understand your point, unless it's a failed effort at pedantry.
- junon 5y ago
  If I put 120 volts through to my MacBook directly over the cable it will invariably damage it. Voltage negotiation doesn't matter here. Also the original comment was unclear; they've edited to clarify. But of course, I'm the bad guy on HN for not being able to read minds. E: I realize my GP comment was also unclear. I should have said "excessive" voltage, not improper I suppose. "Improper" in my head meant outside the rated voltage for either end/the cable. I'm not the one being a pedant here.
  - anamexis 5y ago
    Voltage negotiation matters, because that what keeps a charger from putting 120 volts into your MacBook. Which is exactly what GP was saying in the very part that you quoted: > chargers and cables are advertised with the wattage they support, but it's really the voltage and current that matters. and what you agreed with in that very same comment: > Also, it arguably does have everything to do with volts
anamexis 5y ago
USB-C power negotiation absolutely protects against improper voltage, assuming it is implemented correctly.
- can16358p 5y ago
  Out of curuosity: is there any instance where it isn't implemented correctly that actually damaged/fried some electronics? What I've seen is that in the worst case it doesn't charge or negotiates at a very low voltage and charges slowly.
  - jsjohnst 5y ago
    Yes, I don’t have a search term handy, but there’s someone who maintains a website cataloging these.
danachow 5y ago
What do you think USB power negotiation is for if not negotiating a mutually supported voltage? That’s pretty much why it exists.

Yes and power negotiation does not protect against improper voltage whatsoever. This wasn't my point, despite me addressing negotiation in another comment.

by junon 5y ago

Yes and power negotiation does not protect against improper voltage whatsoever. This wasn't my point, despite me addressing negotiation in another comment.

mlyle 5y ago

> Yes and power negotiation does not protect against improper voltage whatsoever. Oh? Everyone else seems to think the mechanisms are sufficient for safety. > This wasn't my point, despite me addressing negotiation in another comment. I still don't understand your point, unless it's a failed effort at pedantry.

junon 5y ago
If I put 120 volts through to my MacBook directly over the cable it will invariably damage it. Voltage negotiation doesn't matter here. Also the original comment was unclear; they've edited to clarify. But of course, I'm the bad guy on HN for not being able to read minds. E: I realize my GP comment was also unclear. I should have said "excessive" voltage, not improper I suppose. "Improper" in my head meant outside the rated voltage for either end/the cable. I'm not the one being a pedant here.
- anamexis 5y ago
  Voltage negotiation matters, because that what keeps a charger from putting 120 volts into your MacBook. Which is exactly what GP was saying in the very part that you quoted: > chargers and cables are advertised with the wattage they support, but it's really the voltage and current that matters. and what you agreed with in that very same comment: > Also, it arguably does have everything to do with volts

anamexis 5y ago

USB-C power negotiation absolutely protects against improper voltage, assuming it is implemented correctly.

can16358p 5y ago
Out of curuosity: is there any instance where it isn't implemented correctly that actually damaged/fried some electronics? What I've seen is that in the worst case it doesn't charge or negotiates at a very low voltage and charges slowly.
- jsjohnst 5y ago
  Yes, I don’t have a search term handy, but there’s someone who maintains a website cataloging these.

danachow 5y ago

What do you think USB power negotiation is for if not negotiating a mutually supported voltage? That’s pretty much why it exists.