What s going on with the grounding of a single yellow wire in the distribution cabinet

The general yellow wire of the distribution cabinet is a special grounding protection, some are zero protection, some are three-phase five-wire system, and three-phase four-wire system, according to your use requirements to choose the wiring mode.

The primary side current of the current transformer is passed through P1 and comes out of P2, the primary side is not grounded, and the number of primary side ties is determined according to the requirements of the transformer name plate; The secondary side is the incoming segment from S1 to the ammeter, and after coming out, it goes to S2, and S2 is to be grounded. The 2nd side S2 grounding is to prevent the 2nd side open circuit, the 2nd side produces high voltage and the danger occurs, because the current transformer 1 side tie number is far less than the 2 secondary side, when the 2nd side opens, due to the current on the primary side, excitation is generated on the transformer core, the 2nd side winding, the resulting flux is equal to the number of ties * magnetic flux, by Faraday's law of electromagnetic induction, electromotive force = the derivative of the flux to time, due to the number of the 2nd side tie, it will produce a lot of electromotive force, which is very harmful to people.

Wiring method of the grounding wire of the distribution cabinet.

The standard for the inspection of grounding resistance by the power supply bureau is 4?Below, good grounding installation: dig a trench more than 15 meters long and 70 cm deep, use galvanized rice triangle iron to lay a triangle iron per meter in the ditch, and then weld all the galvanized round iron together.

To detect whether the installation ground wire is qualified, it should be 50 meters away from the installation ground wire and then use galvanized iron to cut 70cm, and the resistance value of the installation ground wire should be measured with a European female meter at 4?The following is qualified, and this ground wire can be used as the grounding of the distribution box.

This yellow wire is a grounding wire, so it should be connected to the ground.

First, the grounding requirements of the grounding wire of the distribution cabinet: The power supply bureau inspects the grounding resistance standard of 4 or less, and the good grounding installation: dig a trench more than 15 meters long and 70 cm deep, and use galvanized rice triangle iron to play every meter in the ditch.

It is set to be grounded with a single yellow wire, which is specified.

If the midterm is just a route, ground. Then we can check the load of this item. Disconnect all the shunt switches and check the wiring first, then check all the loads in turn.

The distribution cabinet body and cabinet door need to be grounded with yellow and green wires.

The distribution cabinet is grounded with a single yellow line, what's going on? I think grounding may be an earth fairy, it's all like this.

If you accompany her worries, we can still make better adjustments to bring us better help in order to bring us better help, and I think this is also the case.

The distribution cabinet is generally a three-phase five-wire system, three are phase wires, one is connected to zero, and a single yellow wire is grounded.

The color markings and yellow lines inside the distribution box are safety lines.

The yellow wire is grounded for safety, you can call the electrician a ** and ask what the principle is?

The yellow wire grounding you are talking about may refer to its ground wire, and there are individual words that you need to set the ground wire.

Why is the ground wire electrified1, it may be that the earth is not equipotential, in this case, after the ground wire is connected to the earth, there is also a potential difference, which also leads to the ground wire being electrified. 2. There are high-frequency interference sources around the ground wire, which will also affect the normal operation of the ground wire, resulting in the ground wire being electrified. 3. In addition, near the PE line, there is a large current passing through, which leads to some stray current flowing to the PE line, resulting in the leakage of the ground wire.

4. If the N wire and the PE wire are shared, or the N wire and the PE wire are connected in reverse, it will also cause the ground wire to have electricity. 5. The electrical equipment used has the phenomenon of leakage, and the phase wire and ground wire are short-circuited. Or due to rainy weather, the circuit is short-circuited, and the wire will be electrified.

The grounding wire of the distribution cabinet has too much impact on safety, and the main reasons are:

1. The insulation layer of the live wire is damaged and the distribution cabinet is in contact.

2. The insulation layer of the phase wire and the ground wire is damaged and short-circuited.

3. The grounding terminal is short-circuited with the phase wire.

Solution: 1. Check whether the live ground wire is shorted with the phase wire.

2. Check whether there is any damage to the live wire around the ground wire grounding terminal.

3. Whether there is a common circuit breaker on the grounding wire and whether the circuit breaker is damaged.

4. Whether the grounding wire shares the power supply with other circuit breakers, and the currents are connected to each other.

Your grounding back may not be well connected, some places may be virtual, the surface looks fine, you check the ground wire well, don't break it in the future, it will be dangerous,

Zero-ground unity, three-phase imbalance.