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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.
The secondary (120 V side) of the lighting transformer has one of its terminals connected to ground. This grounding procedure is done to reduce the possibilities of shocks due to an internal fault in the transformer. The grounded terminal of the 120 V lighting supply is often referred to as the lighting neutral.