If this is a residential system there are likely two hot wires, black and red. White is neutral and there will be 115 volts between white and either hot. Ground is typically green or a bare wire.
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If this question is really asking about a 50 Hz service - as its Category has been set to - the colors are definitely not as shown in the answer shown above. Those colors are only correct for USA, Canada and countries running a 60 Hz supply service.
Answer for countries in Europe and other world areas running a 50 Hz supply service.
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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 JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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