The answer one:
1, structural distinction:
0 lines (N) : After nodding ground connection from transformer neutral derivative mainstay line.
Ground wire (PE) : After nodding ground connection from transformer neutral derivative mainstay line, according to the standard, every removed 20-30 rice iterative earth.
2, the distinction of the principle:
0 lines (N) : Basically apply at working loop, the tension that 0 lines place produces is equal to line block to take the electricity with working loop. As a result of the transmission of Sunday run, the tension that 0 lines produce cannot be ignored, as tutelar body safe measure becomes unreliable.
Ground wire (PE) : Need not at working loop, regard protection as the line only. Those who use the earth is absolutely " 0 " voltage, produce leakage of electricity when equipment crust, electric current can flow into the earth quickly, although produce PE line to have the case of open circuit, also can flow into the earth from the ground connection body around.

The answer 2;

1. sets according to GB, both is isolated from each other;
0 lines of 2. are from transformer medium-sized dot is brought directly go out, ground wire is made in the earth according to the standard. This kind of system is three-phase 5 lines make power supply system.
0 lines of 3. can enter switch, ground wire cannot
4. ground wire can have iterative earth;
5. both is absolutely not OK crossing-over, otherwise, have risk getting an electric shock. ©ÓA í û ? \U½ ? Bbs.byf.comß ? ´ ì õý ? ù · Ð