My (newish) 30-min dial timer for my bathroom lights keeps sticking. I've been told that some silicone based lubricant should be safe to spray into the mechanism. Am I going to burn down my house?
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Silicone is non-conductive and will work fine. Another name for it is dielectric grease which is literally used to insulate electrical terminals from water and debris.
Your dial is probably sticking from the humidity in the bathroom while the shower is going. Keep the bathroom fan running when the shower is going to prevent humidity buildup.