How to distinguish between the fire wire ground and zero wire with a multimeter how to measure the
1, the use of capacitance pen test:
Test with a capacitive pen under power on, will be bright is the firewire; determine the firewire, respectively, with the remaining two lines connected to the 220V bulb, and then connected to the firewire, power on, bright is the zero line, the dark is the ground line.
2, look at the wiring colour analysis:
Under standard circumstances, the warm line (red, orange, yellow, etc.) is the fire wire; cold line (black, brown, blue, etc.) is the zero line; yellow-green interspersed (flower line) is the ground line.
3, look at the location of the socket hole judgement:
In the three-hole socket, the standard case, the left is the zero line, the right is the fire line, the upper side is the ground line. General installation are so stipulated, corresponding to the three-hole plug zero wire and fire wire labelled with the opposite left and right (mirror image).
Steps to distinguish ground and zero wires with a multimeter:
1, take out the multimeter, the multimeter conversion switch rotary to AC 250V or 500V gear, specific regulation gear specific analysis.
2, with the red pen on the fire wire, black pen on the other two lines, for insurance purposes, it is best to use the multimeter resistance file and then you measured out of the ground line with your building in the steel bar and then measured, there should be a not too big resistance (or access, due to the grounding resistance of each building is different, so the measured resistance resistance is also different.)
3, when the multimeter reading appears high value, the measured for the fire wire. And a meter pen with a hand holding the metal head, a meter pen to touch the three lines, that one of them is going to have a swing.
4, if the needle does not move, will be the multimeter conversion switch gear by gear down to the lowest gear, there is still no obvious readings, then the measured point for the zero line.
5, if there is no grounded place can also be used in the following way: the multimeter switch to AC voltage gear, any one of the pens connected to the power supply to be measured, the hand index finger and thumb pinch the other pen, if the multimeter has readings. If the multimeter has a reading, the measured point is the firewire; if the multimeter pointer does not move, it is the zero line or ground.
