L: live line, N: neutral line.
1. Use color to distinguish: In the power cable, green and red represent phase A, phase B and phase C respectively (the wire under three-phase voltage represents the). neutral line, and yellow and green are two colors. Represents the ground wire.
2. Use an electric pen to distinguish: the live wire will glow when tested with an electric pen, but the neutral wire will not.
3. Use a voltmeter to distinguish: the voltage between the phase wires (that is, the live wire) is 380V, and the voltage between the phase wires (live wire) and the neutral wire (or a good grounding body) has a phase voltage of 220 V, and the voltage between the neutral line and a good grounding body earth is 0 V.
Detailed information:
Notees:
Depending on the meter load, inductance coils with different transformation ratios can be selected to meet the usage requirements. For example, if an electric meter with a specification of 3x1(2)A is used with an inductor coil and the inductance coil ratio is selected as 1:50, the maximum current rating that each phase can carry is of 100 A.
In accordance with regulations, the neutral wire of the 380 V civil power supply must not be earthed at the input. If grounding is done on the transformer side, this grounding is to ensure that the potential is not higher than the supply voltage due to floating potential. There is some resistance in the ground between the user side ground and the user side ground. the end of the transformer. Power method is wireunder voltage and a neutral wire, that is to say the conductive wire of the neutral point, forming a loop. There is also a ground wire connected to the single-phase, three-conductor power outlet.
The neutral wire of the generator does not need to be grounded and the ground wire is grounded separately. The neutral line is the neutral line N, which forms a loop with the live wire and does not need to be grounded. Grounding is primarily for protection. To prevent leaks due to hull electrification or insulation damage, multiple ground wires should be installed. The ground wire must be grounded because people stand on the ground and form a loop with the ground. .