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Ground is more common in North American English, and earth is more common in British English.) Under normal conditions, a grounding conductor does not carry current. Neutral is a circuit conductor that normally carries current back to the source, and is connected to ground (earth) at the main electrical panel. In the electrical trade, the conductor of a 2-wire circuit connected to the supply neutral point and earth ground is referred to as the neutral.
Reversed hot and neutral wires. Measuring hot-to-neutral voltage by itself doesn't tell you if those wires are reversed. You must measure neutral-to-ground or hot-to-ground voltage. If the neutral-to-ground is 120V and the hot-to-ground is a few volts or less, then the hot and neutral wires are reversed (Fig. 1). Neutral-to-ground connection. Some neutral-to-ground voltage should be present under load conditions, typically 2V or less. If the voltage is zero with a load on the circuit, then check for a neutral-to-ground connection in the receptacle, whether accidental or intentional. Reversed neutral and ground wires. To check for reversed neutral and ground wires, measure the hot-to-neutral and hot-to-ground voltages under load. The hot-to-ground reading should be higher than the hot-to-neutral reading.