Take these simple precautions to have a safe, happy holiday season: Buy a fresh, green tree, and keep the stand filled with water. (Dry trees burn much easier than properly cared-for trees.) More than one high-wattage device can overload an electrical outlet. Damaged or counterfeit extension cords or Christmas lights can cause fires. Avoid products that lack brand labels and certification marks. Space heaters should be kept at least three feet away from combustible items.