In theory, Viet Nam uses TCVN 6190:1999 for electric sockets.
In this standard, the socket’s hole’s diameter is between 5.5mm and 6 mm. If Vietnamese people follows this standards, all A, C, E and F plugs can be plugged easily.
However, most of Vietnamese electrical sockets and plugs (like this one) still use the old standard (TCVN 6190:1996), I can’t find that document at the moment, but IIRC, the pin diameter is only 4mm. Because, we can’t plug the 4mm diameter into 5mm diameter sockets (the plug will slip out anyway, and it’s not safe), no one bother to buy the 5mm diameter socket, unless when they realy need it.
Hence, most of Europe plug won’t be plugged in easily, unless it’s Φ5 socket.
Here is my personal socket:
It was made by LiOA, the yellow one, which is the bigger one, is the Φ5 socket.
Sockets in SE Asia are often stiff and difficult to plug into. I find it especially true of Euro type C plugs, as the contact springs can be very tight and stiff (cheap products likely the real reason). US flat blades sometimes run into issues with the wider polarity blade not fitting the same sized slots.
We just built a house in Thailand and I actually took a couple of plugs with me to the store when we sourced the electrical outlets for our electrician to make sure they plugged well.
Credit:stackoverflow.com‘
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