that's the earth plug and it must be connected, otherwise circuit protection will not operate properly.
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You can't but you can install a plug on the end of a cord. Just go purchase one and install it. Very simple to do. Black wire goes to copper screw, white wire goes to silver screw, and ground or green wire goes to ground screw. It both wires are brown then connect the wire with the ridges on the outside of the wire to the silver screw as it is the neutral. The wire that is smooth is the black hot wire which connects to the copper screw.
If there is no ground wire connect the ground wire to the neutral wire.
Wall receptacles are wired in parallel. black to black, white to white, ground to ground.
Answer for UK, Europe and countries running a 50 Hz supply service.It all depends on which connection you are using. Alternating Current (AC) or Direct Current (DC). In AC there are generally two modes of transmission. Single Phase or Three Phase. In case you don't have 3-phase connection just combine yellow and green.According to Standard, Green is for the Earth Wire and Red is for the Live wire. Blue or Black is for the Neutral Wire. So best option is to combine the Yellow and Green.
The live wire is brown in coulor while the earth wireis green and yellow in color and neutral wire is blue in colour. Uses of these three wire: Live wire:It's connected with fuse.It carries a voltage which drives electric current through the electrical appliances. Earth wire:It is a safety device and protect us from electric shock. Neutral wire:It offers a return path by electric current.