How to measure leakage with a multimeter? Distribution box leakage check method
Before using a multimeter to detect leakage in the distribution cabinet or distribution box, we should first look at the distribution box to see what fault phenomenon, what are the obvious characteristics; secondly, from the surface to observe whether there is any intuitive point of failure, and then proceed to the next step in the inspection.
1. first disconnect the main disconnect switch of our power inlet, turn off the electrical load of all loads, such as unplugging the refrigerator, disconnecting the water pump switch, etc..
2. Put the digital multimeter on the 200M ohms gear, a pen on the load side of one of the two outgoing wires, the other pen touching the wall, preferably touching the grounding wire or temporary grounding wire. Waiting for the multimeter on the display of the number of stable, read out the insulation resistance value of the main line, if the insulation resistance value is less than 0.5 megohm, then it is the main line out of the problem, if the insulation resistance in the 0.5 megohm more than that can be ruled out is the main line out of the problem. Measure another wire in the same way, also check the value to see if the main line is a problem.
3. Check the insulation resistance value of the sub-circuit and each electric appliance, also use the same method to test one by one, until you find the fault point.
Precautions for operation
1. when using the 200M block of the multimeter ohmmeter, pay attention to the metal parts of the pen can not be touched by hand when measuring, which will make the reading inaccurate. 2. when measuring the insulation resistance of each electrical equipment, the same method is used to test the insulation resistance of each electrical appliance until the fault is found.
2. When measuring each electric equipment, pay attention to the discharge first, in order to prevent the capacitive current in the electric equipment from hurting people.
This method is a safer way to find faults in the absence of electricity. This method is also applicable to power users and plant leakage of the search, but in the search, not only to disconnect the power supply into the line, but also should be disconnected from the zero line, to avoid electrocution accidents.
