Never try to modify a polarized plug by filling down the big prong.
2.
If it is a polarized plug, connect the neutral wire to the wide prong.
3.
Another safety feature is the polarized plug and receptacle.
4.
Use electrical cords, power strips and surge protectors that have polarized plugs with one blade slightly wider than the other, or grounded three-pronged plugs.
5.
Japanese plugs generally fit into most North American sockets without modification, but polarized North American plugs may require adaptors or replacement non-polarized plugs to connect to older Japanese sockets.
6.
I did find this interesting design from Japan where a 2-prong non-polarized plug fits directly into the slots in any position .-- talk ) 21 : 29, 18 April 2016 ( UTC)
7.
Some extension cords also incorporate safety features such as a polarized plug and receptacle, fusible link, or even a residual-current device ( also known as a ground-fault circuit interrupter or GFCI ).
8.
You can replace the outlets with new-style outlets but, if there's no grounding wire in the wall ( or if the outlet isn't grounded somehow ), you're short-circuiting ( no pun intended ) the safety of the polarized plug or the 3-pin plug.
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