 The three main causes of fires during the Christmas and holiday season are cooking, which is all year round, and then after that it's space heaters and candles. With space heaters, or say for instance kerosene heaters, is to have them at least three feet away from any combustible material. That way that you're going to help prevent a fire from happening. As far as your Christmas lights is know the manufacturer's recommendations on how many strands that you can plug in together, and because there is a limit.