must after a power outage and power

First, if the single girder bridge cranes problems, must after a power outage and power switches wears a sign the job before inspection or repair work to do. It also should be noted that the hook is in the lower limit position, roll on must retain more turns of safety ropes to do the above work, but we should also pay attention to: lifting heavy objects, when the liquid metal, explosive and dangerous goods must be slowly lifted from the ground 100 ~ 200mm, brake test reliability. These are hanging on the line, Shandong use precautions, I hope you usually pay attention to it.