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Bought a water heater and it has not connected a plug. There are three wires probably phase,neutral and earth wire. The colors of wires are red green and black. Of these which one is phase and which is neutral. How can I find earth and neutral wire using a multimeter? Are all devices having the same colour code in wires? Help me to connect the device to a 3-pin plug
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The neutral wire is usually identified by its white or light gray color. To find the neutral wire using a multimeter, set the multimeter to the continuity setting and touch one probe to each of the wires. The wire that registers continuity is the neutral wire. Not all devices have the same color coding for wires, so it is important to test each wire with the multimeter to ensure the correct connection. To connect the device to a 3-pin plug, connect the phase wire (usually black) to the live terminal of the plug, the neutral wire (usually white) to the neutral terminal of the plug, and the earth wire (usually green) to the earth terminal of the plug.

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It all depends on from which country you are from. From seeing the wiring color code, I assume that you are probably from an asian country or a country that follows IEC 60446 standards.
As you have red colour wire, it must be the phase. Green wire should also have a yellow stripe on it. So it must be ground or earth. So the third one ie: black color wire should be the neutral.
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According to wiring color code, I assume that you are probably from an asian country or a country that follows IEC 60446 standards. 

As you have red colour wire, it must be the phase. Green wire should also have a yellow stripe on it. So it must be ground or earth. So the third one ie: black color wire should be the neutral.

 
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The first step is to identify the type of device you have. Is it an AC or DC device? Different colours are used for AC and DC wires, so it is important to know the type of device before attempting to connect it.

Once you have identified the type of device, you can use a multimeter to determine which wire is the neutral wire. Most multimeters will have a setting for measuring AC or DC voltage. Set the multimeter to the appropriate voltage setting and touch the leads of the multimeter to each of the wires. If the multimeter reads 0 volts, then the wire is the neutral wire. If it reads a higher voltage, then it is not the neutral wire.

It is important to note that not all devices have the same colour code for the wires. The colours may vary depending on the manufacturer. It is always best to use a multimeter to identify the neutral wire.
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To find a neutral wire on a device, look for a wire with smooth, round insulation, often white or light gray in color. It is typically the center wire in a cord or the wire connected to the silver-colored screw in an electrical outlet. If unsure, consult a professional electrician for assistance.
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The device has no phase between the colors of the wires. To find the earth wire, just connect the red wire to the positive side of the network and the green wire to the negative side. To find the neutral wire, just connect the black wire to the positive side of the network and the red wire to the negative side of the network.
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To find a neutral wire on a device, you can use a voltage detector or a multimeter to test for the presence of electrical current. Place one probe on the suspected neutral wire and the other on a known ground wire or the device's metal frame. If there is no voltage detected, then the wire is likely neutral. However, it's important to take proper safety precautions and consult an electrician if you are unsure.
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The colors of wires are red green and black. Of these which one is phase and which is neutral. How can I find earth and neutral wire using a multimeter? Are all devices having the same colour code in wires? Help me to connect the device to a 3-pin plug
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Identifying a neutral wire on a device usually requires a multimeter or voltage tester. Measure continuity between wires and ground while the device is off. The wire that shows no voltage and completes the circuit is likely the neutral wire. Exercise caution and consult a professional if unsure.
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