The easiest way to pinpoint a neutral wire is to know the color code. Neutral wires are blue, live wires brown, and ground wires are green. The color codes may be different in your country, make sure you know them. (2) However, that is not the best method to use to identify wires. Some electricians may decide to mix up the colors and that is unacceptable and dangerous. So, always use a multimeter test to check the wires to be safe. You may also use a tester; hot wires have 220 or 230 volts whilst neutral wires have zero volts.