You have a potentially deadly wiring problem in which the open neutral could mean someone accidentally switched off the white wire instead of the black wire, or some other horrible mistake. Please call a qualified electrician to diagnose this problem immediately.
black = HOT White = Neutral (current carrying) Green = Ground
You'll have to explain your problem better.If HOT black and Neutral White in your house wiring are both hot then Neutral is NOT bounded to ground in main panel and neutral could be floating. There should be no voltage between Neutral and Ground (Bare wire in panel). By code if there are multiple panels Ground is only bonded to Neutral in th emain entry panel. I have seen cases where this bonding was not done. At your main panel check voltage between neutral and ground. It should be zero.
You don't say "turn off" or turn on". Light should be connected black to black and white to white and ground to ground. If you connect white to ground it will work, but you are then using the ground wire for an unintended purpose. Neutral is bonded to Ground at the panel. Current on ground wire could cause ground loops and may cause GFCI to trip if you have them in your house.
It depends on the color coding standards for what country you are in. In the US, the answer is no. The Neutral (white wire) is grounded at the service entrance to the building. The black wire should have roughly the same voltage to the neutral and to the ground. Something to be aware of: If you are using a meter and checking for continuity between the black wire and ground, it may tell you that they have continuity if the breaker is on.
In Bangladesh the color of live is green and neutral is blue and ground is black.
black = HOT White = Neutral (current carrying) Green = Ground
You'll have to explain your problem better.If HOT black and Neutral White in your house wiring are both hot then Neutral is NOT bounded to ground in main panel and neutral could be floating. There should be no voltage between Neutral and Ground (Bare wire in panel). By code if there are multiple panels Ground is only bonded to Neutral in th emain entry panel. I have seen cases where this bonding was not done. At your main panel check voltage between neutral and ground. It should be zero.
You don't say "turn off" or turn on". Light should be connected black to black and white to white and ground to ground. If you connect white to ground it will work, but you are then using the ground wire for an unintended purpose. Neutral is bonded to Ground at the panel. Current on ground wire could cause ground loops and may cause GFCI to trip if you have them in your house.
Answer for USA, Canada and countries running a 60 Hertz supply service.A test meter across black and ground in a 120/240 split phase system should read about 120 volts. Note, however, that ground is not the correct reference point; neutral is the correct reference point, and the meter should be connected across black and white, or red and white, or red and black. This is because the ground connection is a protective earth ground, not intended to carry current. Since ground and neutral are tied together at the distribution panel, you might expect them to have no potential difference, but impedance in the conductors will result in a voltage drop across neutral, biasing the voltage seen between hot and ground, as opposed to hot and neutral.
It depends on the color coding standards for what country you are in. In the US, the answer is no. The Neutral (white wire) is grounded at the service entrance to the building. The black wire should have roughly the same voltage to the neutral and to the ground. Something to be aware of: If you are using a meter and checking for continuity between the black wire and ground, it may tell you that they have continuity if the breaker is on.
In Bangladesh the color of live is green and neutral is blue and ground is black.
Answer for USA, Canada and countries running a 60 Hz supply service.The Hot wire should be black and the Neutral wire should be white. To further ID the wires, use a voltmeter.Measure between the Neutral and the Hot and you should have current (120 Volts?).Measure between the Hot and Ground and you should have the same current. Between the Neutral and Ground there will be no current.If you don't have a voltmeter, you can use a lamp rated for the current in the wires you're trying to ID (ie, a 120 volt lamp if it's a 120 volt circuit).Wire the lamp between the Hot and Neutral, and it should light up.Wire the lamp between the Hot and Ground, and it should light up.Wire the lamp between the Neutral and Ground, and it should not light up.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
Most likely your "purple" was once black, and is the negative; to verify, trace "purple" to ground, or touch the leads of an ohmmeter to purple and ground. You should get "0" ohms at the correct wire. This assumes a negative ground.
Black & Red are hot, and White is neutral. If it has no place to connect neutral connect neutral to ground.
Without more information that appears to be a 240 volt circuit. Red & black would connect to the 240 volt breaker, white connects to the neutral bar, and ground conductor from the ground rods or ground plate connects to the neutral bar. Make sure that the bonding screw is in the neutral bar and it is screwed through to bond the distribution panel enclosure to the neutral bar.
A ground fault circuit breaker detects leakage current between the hot wire coming off the breaker and the neutral/ground since the neutral is bonded to the ground in the panel, if it senses a current of 6 milliamps or more it will trip. Note: no sharing of the neutral for a circuit on a ground fault breaker If a few milliamps from the hot (black) wire do not return on the neutral (white) wire, then a GFCI assumes that current it traveling harmfully elsewhere through your body. So it disconnects. A GFCI can monitor 15,000 milliamps. But if only 5 go missing, then a GFCI trips.
The black wire is the hot wire through which the electrical current flows to the appliance. The left over voltage which is usually zero flows back to the main circuit panel through the white neutral wire where it flows to ground.