With the gradual increase of rainy and wet weather, the fault repair of the cause of leakage has also increased. I believe that many electricians and friends are moving a lot of brains to find the cause of the leakage. So how can we use the multimeter to easily detect the cause of leakage?
Fault Finding Analysis Â
Before analyzing where leakage occurs, we must first look at what faults occur in the home and what are the obvious characteristics; secondly, we must observe whether there are intuitional points of failure from the surface, and then conduct the next inspection.
1, first disconnect our power into the line of the total isolation switch, close all the user's electricity load, such as unplug the refrigerator, disconnect the pump switch.
2. Place the digital multimeter's gear on the 200M gear of the Ohm range. Place one test lead on one of the two outgoing wires on the load side. The other pen touches the wall. It is best to touch the ground wire or temporarily. Ground wire. After the number displayed on the multimeter is stable, the value of the insulation resistance of the main line is read. If the value of the insulation resistance is less than 0.5 megohms, then the main line has a problem. If the insulation resistance is above 0.5 megohm, it can be eliminated. There is a problem with the main line. Use the same method to measure another wire and check the value to see if there is a problem with the main line.
3. Check the insulation resistance value of the shunt and each electrical appliance, and use the same method to detect one by one until you find the fault point.
Handling Precautions 1. When using the 200M block of the multimeter's ohmic block, note that you cannot touch the metal parts of the meter when you measure, as that will make the reading inaccurate.
2. When measuring each electrical equipment, pay attention to discharge first to prevent the capacitive current in the electrical equipment from hurting people.
This method is a safer way to find the point of failure without power. This method is also suitable for the search for power leakage in power users and buildings. However, when searching, it is necessary not only to disconnect the power supply line, but also to disconnect the neutral line to avoid electric shock accidents. This article is for reference only! Non-professional electricians should not operate casually!
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