A useful source:
https://worldofsockets.com/
this post was submitted on 29 Jul 2025
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Type I
Earth pin doesn't cause the plug to murder your feet like the UK plug.
Angled pins to prevent cross polarisation.
Localised power switch per socket so you can turn something on or off with your toe and not bend down to unplug it.
Looks like a ghost face and when in the double gang formation the switches when on looks like the plate is high.
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The main problem with type I (and a few others) is that it's not recessed. If it comes loose a bit, you still have the problem of exposed live pins.
And the thin pins means that with any weight (wall-wart, etc.), it starts to come out.
Doubly so if it's set into thin plasterboard that already wobbles.
Pins are insulated since 2003.
Also:
Thin stamped construction is cheap, but can still be fitted with sleeving on the live (active and neutral) pins like UK & europlug, but not US plugs. This prevents objects or fingers getting to live pins on a partially inserted plug.
Industry has agreed that leads exit either straight out, or down-and-right, so there is no conflict for horizontal or vertical sockets. Sockets are universally installed earth-down.
Reasonably compact.
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Some images of the plugs, since I didn't know what they looked like.
It was mentioned the pins started being insulated like that second image 20 years ago, but going by the images I found the older uninsulated style is still more common. This is ofc a major shock hazard when plugging in your stuff.
Even with the insulation, you can still reach under the half inserted plug, just less easily and maybe only if you have smaller hands (like children).
Fundamentally flat sockets are doomed to be shock hazards, compare it to the recessed sockets where the entire surface the contacts insert into is cut off from reach before the pin insertion starts, and on top of that the pins of say type F have been insulated for so long many don't know there were uninsulated variants.
Another bonus of the recessed style is the plug doesn't stick as far out of your walls. For extension cords it's probably a bit bulkier, but when you sink the recession into the wallbox of the outlet you can get as flush as the width of the cable with an angled plug.
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Also pretty sure you can step on angled type I plugs resting on their backs. The recessed plugs usually have grips on top so can't rest on their back even when angled. Their pins are also ball-shaped on the end, type I looks quite angular and more painful.
I live in Australia and I just did an audit of the power board that was sitting next to my bed. All four devices and the power board itself all have the insulated pins. I can't remember the last time I saw one that didn't have insulated pins. I'm sure they exist, but they are not common.
We also have RCD on all our circuits so if someone is able to short the pins, it will trip within 20ms or less.
Ironically, those are upside down.
Which usually indicates Chinese Type I - they don't insulate pins but do put earth on top.
We insulate pins but live/neutral is on top.
Oof, I see.
Kinda a bad look for type I when some of the users follow a different spec and ruin all attempts at improving safety or even keeping standards like earth being down.
In comparison the european plugs are moving closer together, for example F+E combo plugs are increasingly common.
I'm a G guy at heart but use I now. My main issue is how easily the pins can bend.