5. The Dangerous “Hack”: Never File Down a Prong
In older homes built before the 1960s, you might find outlets where both slots are the same size. Never file down the wide blade of a plug to make it fit into an old outlet. Filing down the prong bypasses every safety standard mentioned above. It’s better to buy a cheap adapter or, even better, have a professional upgrade your outlet to a modern, polarized version. Bypassing this safety feature is one of the leading causes of holiday-related electrical fires.
6. The “UL” Seal of Approval
You’ve likely seen the UL (Underwriters Laboratories) tag on your light strings. This organization mandates the polarized plug design. When you see that wide prong, you are looking at decades of fire-safety research and engineering aimed at preventing the thousands of electrical accidents that used to happen every December before these standards were enforced.
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