Frayed electrical cords are the primary cause of electrical fires during holidays and celebrations. By maintaining your holiday lights you can minimize risk. You should inspect them each year for fraying, bare spots, gaps in the insulation, broken or cracked sockets and excessive kinking or wear before putting them up. You should use only lighting listed by an approved testing laboratory. Do not overload electrical outlets. Do not link more than three light strands, unless the directions indicate it is safe. Make sure to periodically check the wires – they should not be warm to the touch. And, do not leave holiday lights unattended.