Pointer multimeter to measure whether the wire leakage grounding method
If a user said that his home leakage insurance is not always close the gate, a power supply on the jump how to do, only a multimeter at hand, what other measuring instruments, etc. are not, that the first thought of tripping leakage there are two possibilities, one for the leakage of electrical appliances, the second for the leakage of electricity within the wall, the third leakage insurance itself, the problem of the specific checking measures:
1, the road will be all closed to test the leakage insurance itself has no problem, if the leakage insurance does not jump, prove that it is normal.
2, respectively, one by one to send the air, if one of the low plug caused by leakage trip, then the problem is found.
3, the low plug on the electric plug all unplugged, there are lights should also be removed or closed (because the LED indicator with a multimeter can also measure the resistance).
4, household lighting line is often a fire and one and one ground, in the disconnection of the total power supply and all loads after three lines should be isolated, and any line without the slightest connection between, then as long as the resistance of the multimeter open 10K file, the pointer will be calibrated to zero, and then as long as the ground line with the fire wire and the zero line respectively to measure (because of the ground line straight through, not into the switch), the normal line of non-leakage, the 10k file measurement when the pointer does not have the slightest action! As long as one of the wires with the ground between the needle has a slight action, the problem is found.
5, leakage insurance works:
a). The highest sensitivity must also be in 10mA, 0.1S action, regardless of fire or zero line can not have more than 15mA of electricity into the ground, otherwise that is tripped.
(b). Since the home of the firewire or zero line produced a leakage trip, that leakage current must be more than 15mA, it and the impedance between the ground must be in the multimeter 10k range within 5000k, so the use of the multimeter to detect leakage of power lines is still very applicable.
c). If there is direct contact between the fire or zero and a good ground, the resistance of the two wires should be within 5 ohms, then the degree of leakage can be detected from the ohm gear, X10, X100, X1k, X10k gear.
