Household electricity, are generally three-phase electricity, but also three colors of the line, each color has a common name of the connection, although sometimes can also be used to reverse, but the latter part of the problem affecting the maintenance.
　　First of all, home appliances, are generally three-phase electricity, but also three colors of the line, each color has a common call of the law, although sometimes can also be used to reverse, but the latter part of the problem affecting the maintenance.
　　According to the "Residential Decoration Engineering Construction Code" GB 50327-2001 16.1.4 provides: in the wiring, the phase line and the zero line color should be different; the same residential phase line (L) color should be uniform, zero line (N) It is appropriate to use blue, the protection line (PE) must use yellow and green color line.
　　Phase line is what we say FireWire, usually, red, yellow, green as FireWire, blue as the zero line, and the ground is the above mentioned protection line is generally two-color line.
　　As the wire color is more, but under normal circumstances, if you encounter a red line, it must be FireWire. In the single-phase lighting circuit, the general yellow that FireWire, blue is the zero line, between the yellow and green ground and so on.