Precautions for using voltage testers
1. The voltage range of the test pen is usually between 60 and 500 volts.
2. The test pen consists of a metal body at the tip, a resistor, a neon tube, a pen body, a small window, a spring, and a metal body at the end of the pen.
3. When testing a charged object with a test pen, as long as the charged object, pen, and human body form a path to the ground, and the potential difference between the charged object and the ground exceeds a certain value (60 volts), the neon tube in the test pen will emit light (whether its potential is AC or DC), proving that the tested object is charged and exceeds a certain voltage intensity.
4. When using a test pen, the area where human hands touch the pen must be on the metal at the top of the test pen, rather than the metal probe at the front of the test pen.
5. When using a test pen, it is necessary to backlight the small window of the neon tube so that it can clearly see the red light emitted when the charged body is charged.
6. After holding the pen, usually touch the top metal with your thumb and index finger, touch the test point with the pen tip, and observe whether the neon tube emits light at the same time. If the neon tube of the test pen emits weak light, it cannot be concluded that the voltage of the charged body is not high enough. It may be due to dirt on the test pen or the test point of the charged body, or it may be testing the ground wire of the charged body. At this time, the test pen must be wiped clean or a new test point must be selected.
7. After repeated testing, the neon tube is still not bright or slightly bright, in order to finally determine that the test body is indeed not charged.
8. Using the wrong method of holding a pen to test a charged object can cause an electric shock accident, so special attention must be paid.
9. Electrical operators should concentrate their thoughts, and electrical circuits should be considered "energized" before being determined to be dead by a test pen. They should not be touched by hand, and should not trust insulators absolutely. They should be considered energized for operation.
10. Before work, one should carefully check whether the tools they use are safe and reliable, and wear necessary protective equipment to prevent accidents during work.
11. After taking safety measures (after the power outage is completed), a warning sign stating "Someone is working, no switching on" must be hung on the switch handle or line to prevent others from transmitting power midway.
12. When using a test pen, pay attention to the test voltage range and do not use it beyond the range. Generally, electric pens are only allowed to be used at a voltage below 500 volts.
13. All dismantled wires during work should be handled properly, and the live wire ends should be wrapped to prevent electric shock.
14. The capacity of the wires and fuses used must meet the specified standards, and the selection of switches must be greater than the total capacity of the controlled equipment.
15. After the work is completed, the temporary ground wire must be removed and checked for confirmation.
16. After the inspection is completed, it is necessary to carefully check whether it meets the requirements and contact relevant personnel before power transmission.
17. When a fire occurs, the power should be immediately cut off, and carbon tetrachloride powder fire extinguishers or yellow sand should be used to extinguish the fire. It is strictly prohibited to use water to extinguish the fire.
18. After the work is completed, all staff must evacuate the work area, remove warning signs, and evacuate all materials, tools, instruments, etc. The original protective devices must be installed at any time.
19. If power transmission testing is required, it is necessary to contact relevant personnel to avoid accidents.
