Measurement with electrician clamp meter use and precautions
Clamp ammeter is divided into high and low voltage two kinds, used in the case of not dismantling the line to directly measure the current in the line. Its use is as follows:
(1) the use of high-voltage clamp meter should pay attention to the voltage level of the clamp ammeter, is strictly prohibited to use low-voltage clamp meter to measure the current of the high-voltage circuit. Measurement with a high-voltage clamp meter, should be operated by two people, non-duty personnel to measure should also fill out the ** kind of work ticket, measurement should be wearing insulated gloves, standing on insulating mats, and shall not touch other equipment to prevent short-circuit or grounding.
(2) Observe the meter time, pay special attention to keep the head and the charged part of the ** distance, the distance between any part of the human body and the charged body shall not be less than the entire length of the clamp meter.
(3) When measuring on the high-voltage circuit, it is prohibited to use a wire to connect another meter from the clamp-on ammeter to measure. Measurement of high-voltage cable current of each phase, the distance between the cable head line should be more than 300mm, and good insulation, to be considered convenient to measure before.
(4) Measurement of low-voltage fusible fuse or horizontally arranged low-voltage busbar current, should be measured before the phases of fusible fuse or busbar with insulating materials to protect the isolation, so as not to cause phase-to-phase short circuit.
(5) Measurement is strictly prohibited when one phase of the cable is grounded. Prevent the occurrence of low insulation level due to the cable head to ground breakdown explosion and endanger personal safety.
(6) Clamp ammeter measurement after the end of the switch to * large range gear, so as not to accidentally overcurrent the next use; and should be kept in a dry room
