Wiring a light switch incorrectly can result in a range of hazardous electrical malfunctions depending on the mistake. Reversing the line and load wires on a standard switch may allow it to function, but it leaves internal components energized improperly and violates safety codes. Connecting hot power directly to a neutral wire creates an immediate short circuit, causing a massive spark, tripping the branch circuit breaker instantly, and potentially destroying the switch electronics or risking fire. Verification: Use a non-contact voltage tester to verify correct terminal voltage before restoring power, and test switch actuation carefully to ensure zero buzzing or tripping.
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