A good grounding system is an important guarantee for the safe and reliable operation of power, telecommunications, and electrical equipment. The size of the grounding resistance is the basis for evaluating the quality of the grounding system. Below, the editor of graphite based flexible grounding body will introduce the wiring method of grounding resistance.

1、 Grounding resistance testing requirements:

a. The grounding resistance for communication work should not exceed 4 Ω;

b. Grounding for safety work, the grounding resistance should not exceed 4 Ω;

c. DC working grounding, the grounding resistance should be determined according to the specific requirements of the computer system;

d. The grounding resistance of lightning protection ground should not exceed 10 Ω;

e. When using joint grounding for shielding systems, the grounding resistance should not exceed 1 Ω.

2、 The ZC-8 grounding resistance tester is suitable for measuring the resistance values of various power systems, electrical equipment, lightning rods, and other grounding devices. It can also measure the resistance value of low resistance conductors and soil resistivity.

3、 The editor of the graphite based flexible grounding body reminds you that the operation of this instrument consists of a hand cranked generator, a current transformer, a sliding line resistor, and a ammeter. All mechanisms are installed in a plastic shell with a leather shell for easy carrying. The accessories include auxiliary probe wires, etc., which are packed in the accessory bag. Its working principle adopts a reference voltage comparison formula.

4、 Before use, check if the tester is complete. The tester includes the following components.

1. One ZC-8 grounding resistance tester

2. Two auxiliary grounding rods

3. One wire for 5m, 20m, and 40m each

5、 Usage and Operation: 1. The wiring method for measuring grounding resistance is specified. The E terminal on the instrument is connected to a 5m wire, the P terminal is connected to a 20m wire, and the C terminal is connected to a 40m wire. The other end of the wire is respectively connected to the grounding electrode E ˊ of the measured object, the potential probe P ˊ, and the current probe C ˊ, and E ˊ, P ˊ, and C ˊ should be kept straight with a distance of 20m. 1.1 When measuring grounding resistance greater than or equal to 1 Ω, the wiring diagram is shown in Figure 1. Connect the two E terminals on the instrument together.

When measuring a grounding resistance of less than 1 Ω, the wiring diagram is shown in Figure 2. Connect the two E-terminal wires on the instrument to the tested grounding body to eliminate the additional error introduced by the resistance of the connecting wires during measurement.

2. Operation steps

1. All wiring at the instrument end should be correct and error free.

2. The instrument wiring should be firmly in contact with the grounding electrode E ', potential probe P', and current probe C '.

3. After the instrument is placed horizontally, adjust the mechanical zero position of the galvanometer to zero.

4. Set the "magnification switch" to the maximum magnification and gradually increase the speed of the handle to reach 150r/min. When the ammeter pointer deviates in a certain direction, rotate the dial to restore the ammeter pointer to the "0" point. At this time, multiplying the reading on the dial by the magnification level is the measured resistance value.

5. If the dial reading is less than 1 and the ammeter pointer is still not balanced, the magnification switch can be set to a lower magnification level until it is fully balanced.

6. If the ammeter pointer of the instrument is found to be shaking, the shaking handle speed can be changed to eliminate the shaking phenomenon.

The above is an introduction to the wiring method of grounding resistance brought to you by the editor of graphite based flexible grounding body. We hope it can be helpful to everyone.