They are referencing the lack of isolation on the prongs for US plugs. If a US plug isn’t fully inserted, it’s possible for both of the two prongs to form electrical connections with the outlet, whilst not yet being fully inserted.
This means a small part of the prongs which are now at 110V potential to each other is exposed, and could potentially be touched by a child, or cause a short circuit if an object gets into the gap.
So yeah, the electrical code in the US for household plugs is just straight unsafe.
You can see the way to do it properly in this post: Notice how the two L+N prongs only have exposed metal at the very tip, this, if they’re inserted deep enough to create contact, it’s not possible for any exposed metal to still protrude from the outlet.
They are referencing the lack of isolation on the prongs for US plugs. If a US plug isn’t fully inserted, it’s possible for both of the two prongs to form electrical connections with the outlet, whilst not yet being fully inserted.
This means a small part of the prongs which are now at 110V potential to each other is exposed, and could potentially be touched by a child, or cause a short circuit if an object gets into the gap.
So yeah, the electrical code in the US for household plugs is just straight unsafe.
You can see the way to do it properly in this post: Notice how the two L+N prongs only have exposed metal at the very tip, this, if they’re inserted deep enough to create contact, it’s not possible for any exposed metal to still protrude from the outlet.