Correctly mapping wires to a standard electrical switch requires identifying four distinct conductor roles. The bare copper or green insulated wire connects directly to the green grounding screw on the switch yoke. The white neutral wire bundle (required for smart switches) is tied into the back of the box with the switch's white wire using a wire nut. The black hot wire coming directly from the service panel connects to the brass line terminal. The remaining black or red load wire leading out to the light fixture connects to the remaining brass load terminal. Verification: Test all wire nut connections with a firm tug to ensure they are secure, wrap the switch in electrical tape, and restore breaker power to verify safe operation.
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