NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
Deyang cable fault detection professional manufacturers remind you to prevent cable faults in advance. Abstract Imagine that when the electrical equipment shell is charged, once a person touches it, the current flows through the human body to the earth, and the person is also electrocuted. If the electrical equipment is grounded, it is quite grounded. The professional manufacturer of fault detection reminds you to prevent cable faults in advance. Abstract Imagine that when the electrical equipment shell is charged, once a person touches it, the current flows through the human body to the ground, and the person is also electrocuted. , the current flowing through the human body and the grounding body is inversely proportional to its resistance. The smaller the grounding resistance of the grounding body, the smaller the current flowing through the human body. When the grounding resistance is extremely small, the current flowing through the human body is almost zero, and people can avoid the danger of electric shock. Therefore, the size of the grounding resistance value is an important criterion for checking whether the grounding device is good.
According to the national standard regulations, the grounding resistance of the working grounding is usually 0.5-10Ω, the grounding resistance of the protective grounding is 1-10Ω, the grounding resistance of lightning protection grounding is 1-30Ω, the resistance of electrostatic grounding is required to be less than 30Ω. Therefore, when installing or repairing the grounding device, we only need to measure whether its grounding resistance is within the safe range. There are many ways to measure grounding resistance. At present, there are special grounding resistance testers on the market, whose measuring resistance range is 0-200Ω, The accuracy is up to 3%, the 3 (1/2) digits are displayed, the battery can be installed, and it is easy to use.
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