How to do a wiring check with a multimeter before power is applied
The site wiring is threaded with lights and panels installed. How do I measure the wiring with a multimeter to see if there are any problems before I send power? To ensure that the wire panel lights are not burned when the power is sent.
The first step to confirm the rated voltage of the lamps and lanterns and take power at the voltage is consistent, with a multimeter gear to AC voltage 500 (600) V gear measurement of the power to take power at the (switch) input voltage can be known to be 220V or 380V, the general lamps and lanterns rated voltage is 220V, if through the 380 Ⅴ voltage will be burned lamps; the second step in the absence of power before the power to take the power to take the power at the (switch) output end of a multimeter adjusted to the Diode gear to measure the lamps and lanterns to take power lines are short-circuited, if there is a short-circuit resistance value is generally between 0 and a few Europe (000-010), when this needs to be the next step in the confirmation and detection, if the value is a few thousand ohms or infinity can be disregarded; The third step to confirm that the lamps and lanterns of the on-line voltage and line is not short-circuited under the circumstances of the energisation (close the switch), if the power take-off point (switch) to control the lights do not light up, it is necessary to Check the lamps and lanterns end of the public line is disconnected, disconnect the public end of one of the bandages (public wiring) disconnect the line and pay attention to the line does not touch anything else, and then energised with a multimeter adjusted to the AC voltage of 500 (600) V stalls, you can use the black table ground, red table when the pen were testing the measurement of disconnecting the line at both ends, if the meter shows the voltage of a few tens of volts or more to measure the line shows that the line has no Disconnect, if the test is no voltage at both ends of the need to disconnect at the power take-off (switch) two lines to switch to connect and then measure, there is a good voltage end line, no voltage end line is out of the anomaly, the former is suitable for 380V line pass judgement measurements, the latter is suitable for 220v line pass judgement measurements; if only a local lamps and lanterns do not light up the lamps and lanterns, re-examining the sub-lines, power supply output connection and other issues.
