Because it's completely impossible to prevent people from being able to touch a live contact in a socket that must accept many different types of plug. Safe sockets firmly grip the plug they are designed for. This socket cannot, since it must be willing to accept anything you stick in.

Without being able to grip any individual plug's prongs, any actual plug plugged into the socket will always hang from it. This exposes the top of the live contacts, now flowing with mains (!!) power.

> https://www.ana.co.jp/cont-image/common/etc/0059-lang-multi....

Look at the image above. Note the sheer size of those bottom holes, and remember that the socket can't firmly grip anything (compare the narrow US/Japanese holes, the diagonal Australian/Chinese holes, the circular European holes, the outer British holes - all overlapping but in different places). You are basically guaranteed to get exposed contacts.

This is just bizarrely dangerous on a transcontinental flight where you might be asleep, covered in blankets, etc. Given that this kind of socket would be illegal to install in your own home under most electrical codes, I have no idea why it's fine on a plane.

(And that's without getting into how this provides a completely incorrect voltage to most of the plugs, or how it encourages folks to try to shove non-compliant plugs into all that spare room, or the existence of plugs like Argentina's, that will fit but will be electrified on the wrong prong, etc etc)

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sidewndr46 a day ago | parent [-]

I don't have need to look at this image, I've used this outlet safely plenty of times. I've helped other passengers use them as well. I've never seen a plug "hang" from it. In fact they usually are so firmly attached I have difficulty removing them.

You're argument about "exposed contacts" is absurd. The entire design of the US plug is exposed contacts. Anyone can and will find a way to use them in an unsafe manner. We allow people to eat with steak knives, despite them being able to cut their own jugular vein with them.

This socket does not provide "half" the power. It provides around 110 VAC to most outlets. Almost all devices you are going to be using are rated for 90 VAC-240 VAC. The frequency range is wide too, 47-63 Hz. Some of them work all the way up to 277 VAC as a rated voltage. The actual socket is incredibly complex and monitors for the presence of a load & the total current. Have you ever noticed the flight attendants know exactly who is using the plugs at what time? If you actually plugged a 240 VAC angle grinder into this plug, it would just turn off immediately.

This socket would be explicitly legal to install in almost any jurisdiction in the US so long as it has the right engineering documents. Equipping your home with these outlets would be so many orders of magnitude safer than normal wiring, although you could not run devices like a vacuum cleaner or a large appliance.

	▲	troad a day ago \| parent [-]
		Sorry, but no. Respectfully but firmly disagree. > You're argument about "exposed contacts" is absurd. The entire design of the US plug is exposed contacts. Anyone can and will find a way to use them in an unsafe manner. We allow people to eat with steak knives, despite them being able to cut their own jugular vein with them. This is an absurd argument re electrical safety. We spend enormous time and effort idiot-proofing consumer-facing electrics, and for good reason, consumers are idiots, but even then they don't deserve to be electrocuted by mains power. "You eat with stake knives so you may just as well run barefoot through razor blades" is not a good faith argument. > Almost all devices you are going to be using are rated for 90 VAC-240 VAC. For a narrow range of modern tech devices with adapters, sure. For the average electrical appliance that people grey import from Alibaba or buy roadside in Kuala Lumpur? "Almost all" - how many percent, exactly? Are you just thinking of your iPhone charger? Or are you thinking about some cheap night light that some mum is going to plug in because her kid is scared to fall asleep without it, or some Soviet-grade portable hand heater that some elderly babushka carries around with her? This is typical engineer blindness. "Well the elderly semi-literate Russian babushka should obviously have known that her GOST 7396 space heater from some souk in Dushanbe was not one of the devices I was imagining when I put together my utterly-non-compliant Frankenstein socket..." Really? Why? Is that going to be persuasive to anyone? > Some of them work all the way up to 277 VAC as a rated voltage. What's even your point here? That high voltage devices... exist? What does that have to do with anything? > This socket would be explicitly legal to install in almost any jurisdiction in the US so long as it has the right engineering documents. And murder is explicitly legal to commit! (Terms and conditions apply, must be wearing camo and be pointed vaguely in the direction of the Strait of Hormuz.) Your argument is almost entirely just trivia, and not even categorical trivia at that. 'Well, almost all devices do this...', 'some even work all the way up to... ', 'so long as the right documents are provided...'. These are not acceptable standards when dealing with the public. Consider that 'almost all' people do not steal, and yet we fill public spaces with security cameras. When dealing with risk, you don't just consider likelihood and call it a day, you consider severity too. An event with potentially catastrophic consequences is something one takes seriously, even if deeply unlikely. There are probably tens of thousands of unsophisticated people in the air every second of every day, wanting to plug in their vape chargers and portable hand fans and god-knows-what-else. When your Frankenstein socket - which quite explicitly adheres to no safety standard whatsoever - inevitably fails and causes property or health damage, and you're trying to explain why you ever thought it was a good idea to some safety auditor or, God forbid, a judge, how far do you think your steak knife analogy is going to take you? Or the curio that 277 V devices exist? Or the fact that this is illegal to install in a home, but you think you could get a special permit to do so - well, y'know, not after this incident, your Honour, but sort of abstractly speaking...