If your Christmas lights are old, tangled, damaged, have frayed wires or have burnt out bulbs, it is time to replace them. Make sure your lights have been tested for safety; this will be indicated somewhere on the box. This means that the particular string of lights that you have purchased has been tested in a laboratory to make sure all of the bulbs light up and there are no shorts in the wires. Only plug in three strings of Christmas lights to a single extension cord. Look for Christmas lights that have fused plugs.
Do not use Christmas lights outdoors unless they are specifically labeled for outdoor use on the box. When stringing Christmas lights up outdoors, make sure they are secured to the surface using insulated staples or hooks. If your lights are not fastened, they may be damaged by blowing around in the wind, which can make them unsafe. When you are taking your outdoor Christmas lights back down, remove them gently. Do not yank them down. If you are using Christmas lights outdoors, you should make sure your circuits are grounded with ground fault circuit interrupters. These can either be installed into the house’s electrical system by an electrician or a portable outdoor version can be purchased to use during the holiday season.
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