Quote:
Originally Posted by intarsiabox
Your neutral line (white) also acts a ground wire. The extra green ground wire is in the event a wire comes loose in a metal electric box the electricity will still be grounded to your house and not electrocute someone or cause a fire.
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I'll have to disagree with this particular statement. The neutral is a return for the hot wire and should not be considered as what is commonly referred to as a 'ground'. The ground in your residence is connected to a grounding stake or other approved method of providing an 'earth' potential. The neutral (white) goes back to your breaker panel and essentially back to the power provider.
If you take a peek inside a properly wired breaker panel, you will see that the ground wire terminals are separate entities from the neutral wires which are attached to one side of your circuit breakers. EDIT: Ok my bad here, the neutrals are not attached to one side of the circuit breakers, but they are on a separate terminal bar which is connected to one of the lines coming into the house from the power company. The ground terminals are still separate from the neutrals though.