While the article says apple isn't too blame you have to wonder how a
dangerous voltage got onto the connector when its so exposed.
It's bullshit. Lightning cables don't put voltage on any pins until
autonegotiation with the connected device is successful. I rather doubt
metal dog tags have a lightning chip in them.
What has really happened is that he's used a knock-off charger with
inadequate isolation between primary and secondary, so he's had mains
voltage on (probably) the metal shell of the lightning connector.
But that wouldn't make for yet another sensational "killer phone" news
report, would it.
(='.'=) "Between two evils, I always pick
Nope what actually happened is that that fool plugged the charger
into an extension cord and then managed to get his stupid jewellery
across the mains pins of the charger when he didn't even manage
to plug the charger into the extension cord properly.
I thought the chain got between the mains pins of the plug or wall-wart and
the socket on the mains extension cable. I don't think there was any
suggestion that mains got onto the low voltage input to the phone.
I think there has to be more to it than that.
Its only 110V and he got sever burns from the chain.
He must have had a path for the current to flow to somewhere and for
quite a time to get sever burns.
Maybe he got a short between live and an earth somewhere?
Is there an actual earth on the connector somewhere?
Yes, I doubt you'd get severe burns if the current flowed through his body.
He probably *did* receive a shock, since he reported being thrown off the
bed, but I think his burns are because a much high current flowed through
the chain (with very little through his body because of its higher
resistance) and the chain was heated up. If he was asleep he may not have
noticed for a few seconds that he was being burned.
Wouldn't have made any difference in this case. Here's what really
a Darwin award candidate by the looks of it.
(='.'=) "Between two evils, I always pick
I'm still not sure I understand what happened, though. Someone, please
His dog tag makes contact with one of the mains pins, and nothing
happens as he's sitting in a nice insulating bed.
Or his tag chain makes contact with both pins, and the metal chain makes
a good conductive path between them, and the mains fuse blows.
Or, he has replaced the fuse with a nail, and the chain melts between
the two pins, so then the conductive path is through the chain round his
neck. And that part of the chain gets red hot, but even so he's only got
to pull away from the plug socket for it all to stop.
Maybe the real lesson to be learnt is only to wear really chunky bling
that will melt the nail you replaced the fuse with?
It sounds as if there wasn't a direct path between the pins via the disc of
the dog tag, as this wouldn't have given him a shock. So that leaves options
1 and 3: contact with one pin and earth or else contact with both pins but
via the chain round his neck. And for him to have got a shock, it suggests
1 - current to earth via his bed etc. If the two ends of the chain had been
connected to live and neutral, I'd expect the chain to get very hot and burn
him, but I wouldn't expect much current to earth causing a shock.
I suppose even if the fuse blew, that would take time and in the meantime a
sizeable current would flow, allowing the chain to get hot.
Are American plugs fused, as our 3-pin plugs are, maybe with fuse of around
13 A, or is the only fuse the one for the whole spur/ring-main circuit? If
the plug wasn't fused then a higher current could flow - at a guess the
"fuse box" fuse might be around 30 A, as for the UK. I realise that since US
voltage as half UK voltages, the fuses may be higher to allow a similar
power to be drawn.
It doesn't say much for the construction of US plugs and sockets that the
pins withdrew so easily and that a chain could fall between plug and
extension socket and touch metal of the pins: with UK plugs, the pins would
probably lose contact with the socket before sufficient of the pin was
withdrawn to allow contact with metal rather than the plastic shield on the
upper part of the pin.
I bet US standards are lower because if the perceived lower danger from a
US plugs and sockets are flimsy in the extreme and a plug could
probably come out of a socket if you kicked it. Even if it didn't come
out completely, it would come out enough to expose live pins. The plug
pins have no insulated part and the sockets have no shutters.
There's no obfuscated Perl contest because it's pointless.
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