Author: Noyafa–Noyafa Cable Tester
Why can't a passive live cable identifier be used to identify if a running cable is live? Price of live cable identification instrument Recently, users often ask: why can't a passive live cable identification instrument be used to judge whether the cable is a running cable. The main reason is that the passive live cable identifier cannot be used to identify whether the running cable is live? Recently, users have often asked: why can't a passive live cable identifier be used to determine whether the cable is a running cable? The main reasons are as follows: Everyone knows that the principle of the live cable identification instrument is: when there is a power supply 50HZ current flowing through the running cable, a magnetic field will be generated alternately along the running cable. By detecting the alternating magnetic field, the live cable can be detected. cable.
However, misjudgment occurs when the following situations occur: 1. If the operating cable has voltage and no load, there is no current flowing through the cable, and the magnetic field cannot be detected at this time. 2. If the cable is not running, but if this cable is in parallel with other running cables, an induced current will be generated, and the induced current will also generate a magnetic field. At this time, the cable identification The instrument will also have instructions, and misjudgment will occur at this time. 3. If there are multiple cables in the cable trench, these multiple cables will generate a magnetic field. At this time, there will be a magnetic field generated by a 50HZ current in the entire area. At this time, there will be a magnetic field in the entire area, making the judgment impossible. Misjudgment is easy to occur.
In the case of misjudgment, it is very easy to cause personal injury. Shenzhen Noyafa Electronic Technology Co., Ltd.
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