Because wiring carries electricity, having it done correctly is a safety issue. Between the power source and the circuits in a building or home, there is a control center -- either a service panel or fuse box. Before anyone works on the electrical system, the appropriate circuits should be shut off at the service panel or the fuse box. Each of these are the controls for circuits, and it's a good idea to identify and label which switch (or breaker) on the service panel or which fuse in the fuse box controls which electrical outlets and which major appliances.
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