How to test the ground wire of the socket and how to measure the ground wire

1. Note that the test cannot be carried out by measuring the resistance, because it is not allowed in the live state.

2. Generally, the method of measuring voltage is as follows: use a multimeter to measure the voltage of the live wire foot to the ground wire and the neutral wire to the ground wire.

1) Normal situation: one voltage is 220V (or close to 220V), and the other is 0 (or close to 0), indicating that the ground wire is good.

3) If both voltages are 0 (or close to 0), it means that there is no ground wire.

3. In addition, it is also necessary to prevent the ground wire foot from being energized (touch the ground wire foot with an electric test pen, if it shows electricity, it is very dangerous and should be overhauled immediately).

If the ground wire is well grounded, there is a voltage of 220 volts with the live wire, which can be measured with a multimeter; If there is no multimeter, a bulb can be connected between the live wire and the ground wire, and if the luminous brightness is normal, the grounding is good; If it is darker, the ground resistance is larger; If it is not lit, it is not grounded. Additional note: If the home is leaked, the light will trip.

It can be measured with the household tap iron pipe, with a multimeter, I have not measured, but it should be very small, and there is a zero line measurement, so to say that if the ground wire is not regular, to a long time in the weather (the ground is dry) when measuring whether the meter is very small with the zero line or tap water iron pipe, the zero line and the tap water iron pipe is the same is better, only for personal safety is not allowed to be connected to it.

The grounding wire is a wire that directly connects to the earth, which can also be called a safety route, and when it is dangerous, it directly transfers the high voltage to the earth, which is a lifeline.

Building grounding wires can be measured like this:

1. Disassemble the connection points between the grounding trunk and the grounding body, or disassemble the connection points of all grounding branches on the grounding trunk.

2. Insert two grounding rods into the ground 400mm deep, one 40m away from the grounding body, and the other 20m away from the grounding body.

3. Place the shake table in a flat place near the grounding body, and then wiring it.

1) Use a connecting wire to connect the grounding body E of the terminal pile E on the table and the grounding device

2) Use a connecting wire to connect the terminal pile C on the table and the grounding rod C 40m away from the grounding body

3) Use a connecting wire to connect the terminal pile P on the table and the grounding rod 20m away from the grounding body.

4. According to the grounding resistance requirements of the ground body to be tested, adjust the coarse adjustment knob (there are three adjustable ranges).

5. Shake the shaker evenly at a speed of about 120 rpm. When the watch hand is deflected, the fine adjustment dial is adjusted until the watch hand is centered. The reading after the trimming dial is multiplied by the coarse adjustment positioning multiple, which is the grounding resistance of the ground body to be measured.

For example, if the trim reading is 10, the ground resistance to be measured is 6.

6. In order to ensure the reliability of the measured grounding resistance, the azimuth should be changed and retested. Take the average of the values measured several times as the ground resistance of the grounding body.

Summary. Hello, I am glad to answer for you: There are several ways to test whether the three-phase jack at home has a grounding wire:

1. Electric pen test:

Contact the live wire and the ground wire at both ends of the electric pen: when the electric pen is turned on, it means that the bottom wire is connected normally, and when the electric pen is not turned on, it means that the ground wire is faulty or not connected. 2. Multimeter test:

Adjust the AC positioning of the multimeter to a gear above 500V, and directly test the live wire and ground wire without distinguishing between positive and negative poles. If it shows around 220 volts, the wiring is correct. If there is no voltage display, it means that the ground wire is not connected or faulty.

How to test whether the ground wire of the three-wire jack at home is connected?

Hello, I am glad to answer for you: There are several ways to test whether there is a grounding wire for the three-phase jack at home: 1. Electric pen test:

Contact the live wire and the ground wire at both ends of the electric pen: when the electric pen is turned on, it means that the bottom wire is connected normally, and when the electric pen is not turned on, it means that the ground wire is faulty or not connected. 2. Multimeter test:

Adjust the AC positioning of the multimeter to a gear above 500V, and directly test the live wire and ground wire without distinguishing between positive and negative poles. If it shows around 220 volts, the wiring is correct. If there is no voltage display, it means that the ground wire is not connected or faulty.

Extension: It should be noted that since the ground wire and the neutral wire are connected in the electrical connection, when the neutral wire and the ground wire are connected in the opposite direction, the above test method cannot judge whether the neutral wire and the ground wire are connected in the wrong position.

I hope the above is helpful to you If you are satisfied with me, please give me a thumbs up

1.Electric pen test.

Use the electric pen to contact the live wire and the ground wire at both ends: the electric pen is --- correct; The pen does not light up--- the ground wire is faulty or missing.

2.Multimeter test.

Use a multimeter to AC a gear above 500V, and the meter pen directly tests the live wire and the ground wire regardless of the positive and negative poles: when it shows about 220V, it means that the wiring is correct; The absence of a voltage display indicates that the ground wire is missing or faulty.

3.Gadget.

You can use a three-pole socket to connect the hard wire, make a test gadget to facilitate the test, and pay attention to the separation of the wire and do not short circuit. Plug in the plug and test the wire directly.

4.Note: Because the ground wire and the neutral wire are connected in the electrical connection, when the neutral wire and the ground wire are reversed, the above two test methods cannot determine whether the neutral wire and the ground wire are connected in the wrong position.

If the three wires entering the socket are all one color, you must have a voltage tester, first use any of the wires to connect the live wire (measured with a voltage tester) at the empty opening, and then find this line at the terminal to make a mark and specify it as the ground wire, and connect it to the upper port of the socket (E terminal); Then take off the wire on the empty open and connect it to the grounding wire of the distribution box. The second step is to use one of the remaining two wires to press to the open live wire, and then find this wire from the terminal as the live wire to connect to the socket (L terminal); The remaining one is connected to the socket (N terminal) as a neutral wire. After all are connected, the person will use a voltage tester to measure the front of the socket panel and the hole on the right is the fire wire, because the regulation is "facing the socket left zero and the right fire grounding", please try it, and pay attention to electricity safety.

1。Measure the voltage of the live wire, the ground wire, and the neutral wire.

You can use the AC 250V file of the pointer meter or the Hongqiao AC 1000V file of the digital meter, first insert the red watch pen into the live wire jack, and then insert the black watch pen into the zero line (vice versa, the AC has no positive and negative poles), and see what the voltage value is at this time (about 220V); Then the red watch pen does not move, insert the black watch pen into the ground wire, such as the voltage value of the fight at this time is a few volts or the watch hand is only slightly biased, indicating that the power socket is not installed with a ground wire; If the voltage value is about 220V or the pointer has a very large deviation, it means that the power socket may be connected to the ground wire. Whether to install the ground wire depends on the test results of the second step, because if the protection in the power socket is connected to zero, this will also happen.

2。Measure the resistance between the neutral and ground wires.

In order to distinguish whether the power socket is "protected to zero", it is necessary to further judge the installation of the mains wiring. First cut off the home entrance wire, that is, break off all the leakage protectors and small circuit breakers in the current home. Then measure the resistance between the ground wire and the neutral wire with the 1 gear of the pointer meter or the conduction file of the digital meter, if the resistance value is very small or directly conductive, it means that the mains wiring uses the protection connection zero, and this connection needs to be canceled; If the resistance value is very large or not on, it means that the ground wire is correctly installed at home and can be used normally. :

To measure whether the ground wire of a triangular socket is grounded, follow these steps:

1.Preparation tool: A digital multimeter or earth resistance tester is required to perform the test.

3.Wiring: Clamp one test lead to the COM (common) port of the DMM and the other to the OHM (ohm) or resistance (resistance) port of the DMM.

Make sure that the test lead ports are of good quality and free of oxides or dirt.

4.Connect to the ground wire: Clip one test wire to the test plier of the DMM, and then clip it to the ground wire hole of the triangle socket to ensure good contact with the ground wire.

5.Measure ground resistance: Clip the other test wire to the other test plier of the DMM and then to the live wire hole of the socket while keeping the previous connection in place. At this point, the DMM should show the resistance value of the ground wire.

If the DMM shows a resistance value close to zero, the ground wire is well grounded.

If the DMM shows a very high resistance value, or if it shows an open circuit (infinity), it may indicate that the ground wire is not well grounded.