What is the reason for the amount of electricity on both wires of household 220V power supply?

Tester for household power supply.

The test has electricity on both wires, and the most likely possibility is that the neutral line is broken at the front end of the test point! (The zero line and the earth communicate) because the electricity of the live wire reaches the end of the zero line through the electrical appliance, and after the zero line is broken, the electricity of the live wire cannot return to the power grid, and can only form a circuit through the electric tester and then to the human body to the earth, so that the electric tester will glow. It is also possible that the live wire is directly connected to the neutral line, and the neutral wire burns out at the front end of the test point, which will also occur as you described.

Remember to use electricity safely!

This issue should be discussed in two ways. The first aspect is that there are only two wires, a live wire and a neutral wire, your fire line voltage is 220 volts, the pen handwriting will be very bright, you measure the zero line is also 220 volts, the pen handwriting is dark, this is the induced voltage, not the true voltage, because it is too close to the live wire caused by the induced voltage.

If you use an old-fashioned contact pen to measure, then when you go to measure the zero line, the indicator light will not light up. The indicator light will only light up when the fire line is met.

There is also a situation where there are a lot of wires in the switch box, then there must be several live wires, and there will also be a situation where both wires have 220V.

Power System Diagram.

It is caused by the broken line or poor contact of the zero line, the normal zero line will not have electricity, first close the main gate of the house, and use the electric test pen to measure the upper 2 lines of the main gate If there is electricity, it means that the outside zero line is in poor contact or disconnected, and it is necessary to call the property power supply for maintenance, if there is no power and one is electric, it means that the incoming line is faulty and some joints are loose indoors.

The phase line is electrified, and the ideal state of the working zero line is not shown to be live, and in actual use, there will be a voltage difference between the zero line and the ground, for the following reasons: 1The ground resistance at the power supply transformer is too large.

2.Three-phase current unbalanced.

3. The line is too long, and the neutral line resistor is shared to form a voltage difference.

The above 3 points will cause a voltage difference between the neutral line and ground.

The neutral wire is broken or the switch is installed on the neutral line, and the neutral wire communicates with the live wire through electrical appliances, so the zero line has electricity.

Household 220 volt power supply, divided into zero wire, live wire, if both have electricity, it is caused by the main zero line broken or poor contact.

It is the zero line that is broken or virtually connected. Then the neutral line is also lit, and the live wire is returned through the light bulb or other electrical appliances. So both lines are bright, but the zero line is slightly darker.

This is because the switch cut-off is the neutral line, so both wires have electricity. If the switch cuts off the phase wires or simply cuts off the double wires, it will never be charged.

This is due to the poor contact of the neutral line or partial disconnection, when the neutral line is broken, the live wire will be energized, and the electrical equipment and the neutral wire will be conducted. Therefore, the zero line will also have electricity.

The 220-volt power supply at home uses ten electric rice grains, and the two wires are electrified, and the reason for this is that the neutral line is broken. Since the other electrical appliances passing through the lamp do not form a closed loop, the neutral line is electrified. Check the neutral line and connect the neutral wire, and it's no problem.

If the fire is 22o, zero is L2 is normal, if the zero fire is about 22o, this is a short circuit, to check whether the circuit breaker and the line joint is loose or the alumina copper wire joint is prone to this phenomenon), so carefully check whether the joint parts and the circuit breaker are loose.

In this case, if the electricity consumption is normal, it belongs to induction electricity, or the switch controls the neutral line; If you can't use electricity normally, it is a fault that the zero line is broken or the zero line is poorly contacted.

The zero line is broken, resulting in the zero line not returning to zero, 6 instead becomes the live line, to find out the position of the disconnection, it may be that the line is loose or broken and the contact is poor, or the leakage or empty break zero.

It is the main zero line that is broken, and the current passes through the electrical circuit to the zero line.

The zero line is broken, and both lines will light up at this time.

There should be a place where there is electricity, check it carefully.

Dear, I'm glad to answer for you: How is it that the two of the electric pen are 12V? A:

Both the neutral and live wires have a voltage of 12V, which is a slight leakage in the line. Why? Under normal circumstances, there is no voltage in the neutral line at home, which should be equal to zero.

If both the neutral wire and the live wire carry a voltage of 12V, it means that the insulation surface of the wire is damaged or the insulation quality is not high. In this way, there is a certain leakage resistance between the wire and the electrical appliances, although people do not feel the phenomenon of hemp electricity when they contact household appliances, which can only show that the leakage is not very serious.