How to use and precautions for electrical measurement clamp meters
(1) When using a high-voltage clamp meter, pay attention to the voltage level of the clamp meter. It is strictly forbidden to use a low-voltage clamp meter to measure the current of a high-voltage circuit. When measuring with a high-voltage clamp meter, two people should operate it. Non-duty personnel should also fill out a second work ticket. When measuring, they should wear insulating gloves and stand on insulating pads. They should not touch other equipment to prevent short circuits or grounding.
(2) When observing the meter timing, pay special attention to maintaining a safe distance between the head and the live parts. The distance between any part of the human body and the live body must not be less than the entire length of the clamp meter.
(3) When measuring on a high-voltage circuit, it is forbidden to use a wire to connect another meter from the clamp meter. When measuring the current of each phase of a high-voltage cable, the distance between the cable head wires should be more than 300mm and the insulation should be good. The measurement can only be carried out when it is considered convenient.
(4) When measuring the current of a low-voltage fusible fuse or a horizontally arranged low-voltage busbar, the fusible fuses or busbars of each phase should be protected and isolated with insulating materials before measurement to avoid causing phase-to-phase short circuits.
(5) When one phase of the cable is grounded, measurement is strictly prohibited. This is to prevent the cable head from breaking through the ground and exploding due to low insulation level, which may endanger personal safety.
(6) After measuring, the clamp ammeter should be switched to the maximum range to avoid accidental overcurrent during the next use; it should be stored in a dry room.
