Generally it should be phase wire-A phase yellow, B phase green, C phase red. Zero wire - light blue, ground wire is yellow and green, if it is a three-hole socket, the left is the zero wire, the center (above) is the ground wire, and the right is the fire wire.
Simply put: A ground wire is a form of electrical protection. Its role is when your electrical equipment leakage or induction charged can quickly through the grounding wire will be the current into the earth so that the equipment shell is no longer charged, thus ensuring the safety of personnel after the equipment.
Extended information1, in the circuit there is a zero line and the ground line, then you will find a high voltage capacitance in the middle.
2, the zero line and the ground line these two are belong to different concepts, not the same thing.
3, zero and ground are not the same potential to ground, the ground is zero potential to ground. Use the nearest point of electrical grounding. The ground potential of the zero wire is not necessarily zero. The nearest point of grounding of the zero line is at the substation or the transformer supplying the electricity.
4, there is another is the occurrence of electric shock. Zero line will sometimes electrocution, when the electric stove does not heat up, do not think that there is no electricity, will not be electrocuted, wrong! There may be such a possibility, from the appliance is very Yuan place zero line disconnected, with a voltmeter will find that the appliance's zero line and the fire wire are electric voltage! Ground will not electrocute people, unless it is a very bad situation, the designer does not understand, or mess with the product!