How to use the multimeter to quickly check where the leakage is (Figure)

The rainy and humid weather gradually increased, and the fault repairs caused by leakage were also increased. I believe that electrician friends are using a lot of brains to find the cause of leakage. In fact, you can easily find out the cause of the leakage by using the multimeter in your hand.

Fault finding analysis

Before analyzing the leakage, we must first look at what is happening in the home, what are the obvious features; secondly, observe the visual point of failure from the surface, and then proceed to the next step.

1. Disconnect the main disconnect switch of our power input line and turn off all the user's power load, such as unplug the refrigerator and disconnect the water pump switch.

2. Place the gear of the digital multimeter on the 200M block of the ohm file, one pen on one of the two outlets on the load side, and the other pen touches the wall, preferably touch the ground wire or temporarily Ground wire. After the number displayed on the multimeter is stabilized, the insulation resistance value of the main line is read. If the insulation resistance value is less than 0.5 megohm, then the main line has a problem. If the insulation resistance is above 0.5 megohm, then it can be excluded. 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 values ​​of the shunt and each electrical appliance, and use the same method to detect one by one until the fault point is found.

Operational precautions

1. When using the 200M block of the multimeter ohm block, be careful not to touch the metal part of the test pen by hand during the measurement, which will make the reading inaccurate.

2. When measuring each electrical equipment, be sure to discharge it first to prevent the capacitive current in the electrical equipment from injuring people.

This method is a safer way to find fault points in the absence of electricity. This method is also suitable for the search of power users and plant leakage, but in the search, not only to disconnect the power supply, but also to disconnect the neutral line to avoid electric shock.

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