Use a multimeter to detect short-circuit faults in the circuit.
When there is a broken wire in the home's circuit or circuit aging caused by a short circuit between the fire wire and the zero wire, generally this short circuit point is difficult to determine where, then the resistance method with a multimeter can be easily found. After the line short circuit, should be disconnected from the main switch, unplug all electrical appliances. The multimeter is placed in the resistance file, the two pens are connected to the fire line and zero line, if the resistance value is zero or very small can be concluded that the short circuit. It is necessary to measure the resistance value between the fire wire and the zero wire section by section, if necessary, you can cut off a section of wire to determine the short-circuit point.
Use a multimeter to detect breaks in the wire.
As the outer layer of the wire wrapped in insulation, the internal breakpoints are difficult to see, with the traditional multimeter detection is very troublesome, you need to use the resistor, a section of the test, time-consuming but also very easy to break the wire. And now the digital one is much simpler, connect one end of the wire with the phase wire, the other end is suspended. One hand pinch the tip of the black pen, the other hand holding the red pen, so that the tip of the wire along the insulation layer slowly from the end of the phase line connected to start moving backward. When the multimeter's voltage reading suddenly becomes small (equivalent to one-tenth of the original reading), from here back to the 15CM is the break point of the wire.
With this method only need to destroy a point of the wire to solve the problem, is not very convenient ah. This method can also be used to detect the break point of the electric blanket.
