The newly erected wires on site are laid across the road or the erected lines, and the new lines are erected at a higher height; Or, although the height of the new line is not high, but the sag is in the hanging position, it is necessary to build insulated steel pipes and bamboo frames above the already erected line to support the wires of the new line to pass temporarily. This kind of frame is called "conductor crossing frame". No matter whether the line is live or not, the voltage level is high or low, and the nature of the line current is what it is, the jumper frame should be erected according to the specifications.