How to use and precautions for measuring clamp meters with electricians
There are two types of clamp ammeters, high voltage and low voltage, which are used to directly measure the current in the line without disconnecting the line.
How to use it:
(1) When using a high-voltage clamp meter, pay attention to the voltage level of the clamp ammeter. 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, it should be operated by two people. Non-duty personnel should also fill in the second work ticket when measuring. They should wear insulating gloves and stand on the insulating pad when measuring. They should not touch other equipment to prevent short circuit or grounding.
(2) When observing the time of the meter, special attention should be paid to keeping a safe distance between the head and the live parts. The distance between any part of the human body and the live body shall not be less than the entire length of the clamp meter.
(3) When measuring on a high-voltage circuit, it is prohibited to use wires from the clamp-type ammeter to another meter for measurement. When measuring the current of each phase of a high-voltage cable, the distance between the cable heads should be more than 300mm and the insulation should be good. The measurement can only be carried out when it is deemed convenient.
(4) When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, each phase fusible fuse or busbar should be protected and isolated with insulating materials before measurement to avoid short circuit between phases.
(5) When one phase of the cable is grounded, measurement is strictly prohibited. Prevent the occurrence of ground breakdown explosion due to the low insulation level of the cable head, which may endanger personal safety.
(6) After the measurement of the clamp ammeter is completed, pull the switch to the maximum range to avoid inadvertent overcurrent the next time it is used; and it should be stored in a dry room.
