Four safety requirements for clamp current meter measurement operations
1) In practical work, it is often necessary to measure the current value of low-voltage wires or equipment. In the measurement of the current of low-voltage busbars and their electrical components in power distribution equipment, the distance between the wires of the low-voltage busbar layout is generally not large enough, and some clamp current meters have large body sizes. Opening the clamp during measurement may cause phase to phase short circuits or grounding. If the posture of the measuring personnel is unstable or their arms shake, accidents are more likely to occur.
Therefore, according to the actual conditions on site, qualified insulation materials must be used to isolate the busbar and electrical components from each other before measurement, and attention should be paid not to touch other live parts.
2) When measuring the current of bare wires, if the distance between different phase wires and between wires and ground is small, and if the insulation of the clamp is poor or the insulation sleeve is damaged, it is easy to cause short circuit accidents between phases and between phases and ground.
Therefore, it is usually not allowed to measure the current of bare wires with clamp ammeters. If it is necessary to measure, safety preparations for insulation isolation of bare wires should be made to prevent accidents from occurring.
3) For a multi-purpose clamp ammeter, all functions must not be used simultaneously. For example, when measuring current, voltage cannot be measured simultaneously. For safety reasons, the test wire must be unplugged from the clamp ammeter.
4) At the measurement site, all equipment should be orderly arranged, and a sufficient distance must be maintained between the various parts of the measuring personnel's body and the charged body, at least not less than the safe distance (the safe distance for low-voltage systems is 0.1m-0.3m). When reading, one often involuntarily lowers their head or waist, and special attention should be paid to the safety distance between their limbs, especially the head, and the live parts.
