Hacker News new | past | comments | ask | show | jobs | submit login

I've been doing a ton of reading on the subject because my unsourced and out-of-hand rejection of what you wrote did not sit well with me, and you may very well be right after all.

Apparently the DC current required is 10 times higher to do comparable damage than the AC current. This is totally at odds with both my first-hand experience and a ton of interaction with professionals. So I'm a bit confused now, there is a whole pile of literature out there that says one thing and then the wikipedia page claims the factor of 10 going the other way, citing a book that I don't have access to.

The fact that the electrical chair is AC was possibly a hint, but the electrical chair was developed during the 'current wars' by the AC proponents. (I'm not sure if they tried to convey the idea that AC was more dangerous that way, it seemed to have been an ill thought out decision from a marketing point of view.)

I'll keep looking and reading to see if I can find an authority that decisively claims either the one or the other.

The factor of 10 seems hard to believe, to generate a 30 mA current through a human body at 230VAC would become 2300V DC for a 300 mA current through that same body (per Ohms law), that's ~800 Watts delivered versus ~80.

2300V 300mA sources are hard to come by but a 600V DC source that can do only a few mA will blow you clear across the room, which makes me wonder what would happen if you happened to interact with a source that is capable of substantially more than that. This would also mean that a 300V DC source such as that battery pack should be perfectly safe to work with but I don't believe that's true for even a moment.

So, my apologies for the unsourced rejection of your claim, to be continued.




>by the AC proponents.

By the DC proponents. Or AC opponents. Definitely part of a long campaign to try to make AC appear dangerous.




Consider applying for YC's Spring batch! Applications are open till Feb 11.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: