If you want to connect it to the metal chassis of anything that plugs into the wall (lamp, computer, PS etc.), it has to be plugged in with a three-prong plug. Otherwise, you are not connected to earth ground. One easy way to get around this issue is to create your own ground plug. Just go to the hardware store, buy a DIY three-pronged plug and run a wire (16AWG/18AWG is fine) from the ground plug and solder it to the lug on your mat. You can also buy one of [https://encrypted.google.com/search?hl=en&biw=1672&bih=833&tbm=isch&sa=1&ei=Kcm3WuXwBoH4_Abfk6f4Aw&q=ESD+Mat+Ground+Cords&oq=ESD+Mat+Ground+Cords&gs_l=psy-ab.3...81811.81811.0.82104.1.1.0.0.0.0.57.57.1.1.0....0...1c.2.64.psy-ab..0.0.0....0.r9TAk3LkKcg|these].
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If you want to connect it to the metal chassis of anything that plugs into the wall (lamp, computer, PS etc.), it has to be plugged in with a three-prong plug. Otherwise, you are not connected to earth ground. One easy way to get around this issue is to create your own ground plug. Just go to the hardware store, buy a DIY three-pronged plug and run a wire (16AWG/18AWG is fine) from the ground plug and solder it to the lug on your mat.
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Or you can also buy one of [https://encrypted.google.com/search?hl=en&biw=1672&bih=833&tbm=isch&sa=1&ei=Kcm3WuXwBoH4_Abfk6f4Aw&q=ESD+Mat+Ground+Cords&oq=ESD+Mat+Ground+Cords&gs_l=psy-ab.3...81811.81811.0.82104.1.1.0.0.0.0.57.57.1.1.0....0...1c.2.64.psy-ab..0.0.0....0.r9TAk3LkKcg|these].
If you want to connect it to the metal chassis of anything that plugs into the wall (lamp, computer, PS etc.), it has to be plugged in with a three-prong plug. Otherwise, you are not connected to earth ground. One easy way to get around this issue is to create your own ground plug. Just go to the hardware store, buy a DIY three-pronged plug and run a wire (16AWG/18AWG is fine) from the ground plug and solder it to the lug on your mat. You can also buy one of [https://encrypted.google.com/search?hl=en&biw=1672&bih=833&tbm=isch&sa=1&ei=Kcm3WuXwBoH4_Abfk6f4Aw&q=ESD+Mat+Ground+Cords&oq=ESD+Mat+Ground+Cords&gs_l=psy-ab.3...81811.81811.0.82104.1.1.0.0.0.0.57.57.1.1.0....0...1c.2.64.psy-ab..0.0.0....0.r9TAk3LkKcg|these].