Mechanical wall light switches are generally durable devices, but it is relatively common for them to wear out over fifteen to twenty-five years of regular daily use. Every time you toggle a switch, the internal spring mechanism experiences mechanical fatigue and micro-arcing across the contacts. Switches controlling heavy inductive loads, such as large fluorescent lighting banks or bathroom exhaust fan motors, tend to fail much sooner due to electrical pitting. You can troubleshoot switch wear easily by monitoring tactile snap action. You can verify that your corrective action is successful when identifying a loose toggle or flickering lights early, shutting off the breaker, and replacing the old switch with a new unit restores crisp operation and reliable lighting control.
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