What Should We Pay Attention to When Using Live Cable Identifier

The emergence of electricity has broken people's original lighting mode and provided us with a convenient and comfortable living environment. Cable has the function of transmitting electric energy and plays a very important role in life. The demand for electricity is so great that sometimes the cable will inevitably have problems. Live cable identification instrument is one of the commonly used fault detection equipment. 1. The operator shall read the operation manual in advance, master the function, working method and work preparation of the instrument, and carry out correct test requirements. 2. Before the test, disconnect both ends of the tested wire with armored grounding, and ground the far end (one end) of the core wire. 3. The two output wires of the cable identifier shall be clamped in red on the core wire of the tested wire and grounded in black. 4. Before turning on the transmitter, the output adjustment knob must be turned counterclockwise to zero before starting. Slowly adjust the output adjustment knob to make the output reach 5a-15a (usually adjust the adjustment knob in the range of two-thirds). If the grounding resistance of the distribution station system is greater than 4 ohms, the output current is less than 8a, and the receiver instrument head can work normally, as long as it can deflect in the positive and negative directions. 5. Note: during field use, if the grounding resistance is too small and the output adjustment knob of the transmitter is zero in one clock cycle, the output current will be very large, and there is a protective circuit action in the transmitter (indicating a small swing of the plug). In Article 2, in the actual test, there are more than two connections between the two transformer chambers between the same cable conduit and other cables, The grounding resistance is connected because there are other armored cables in operation, and the change is very small, even close to zero. If the output current of the transmitter is too large and there is a protection circuit, the resistance can be tested in series in the transmitter loop test. After the test, the temperature of the test resistance is very high. Note that other 1-2 ohm resistors greater than 20W can also be used instead of the test resistance. 6. Before identifying the cable on site, please calibrate the receiver of the live cable identification instrument at the beginning of the wire according to the instrument calibration requirements in the instruction manual. 7. Standard for cable field identification: when the sensor is pasted on one of the cables for test, the header of the receiver will lean to one side and swing more. When testing on other cables (keeping the clamping direction of the sensor the same), the receiver instrument head will lean to the other side and swing less. The cable with the receiver instrument head leaning to one side and swinging sharply is the cable to be identified.

What Should We Pay Attention to When Using Live Cable Identifier 1

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