Low voltage systems are very particular. Did you know that the first light from the transformer CANNOT be closer than 10 feet to the transformer? If the first light is closer, it will not burn the lights. Then too, what is the capacity of your transformer? If its say an 80, and you have 120 total, then it will not burn. Then one other thing that has happened to me, local fire ants took up residense in my transformer and ate the wiring or the chips and killed the trany.