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Yes, the grounded slot in electrical outlets is "live" in the sense that it is intended to conduct the power used by devices plugged into it, same as the "hot" slot. It also happens to be grounded at the service panel, if done properly, as is the grounding slot in a three-slot receptacle. The grounding conductor is, however, intended for safety from electrocution, not to carry any significant power during normal use.

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