
2. The command signal is not clear and does not hang;
3, bundled, hanging loose or unbalanced, may cause slip does not hang;
4. Not hanging when someone is hanging or floating.
5. The structure or parts have defects that affect safety work or do not hang when damaged;
6. Do not lift the embedded object when it is not clear;
7. The workplace is dark, and it cannot be seen when the ground, hanging objects and command signals cannot be seen;
8. When the edges of the objects to be lifted are not padded with the binding wires, they are not lifted;
9, do not hang when pulling a heavy load;
10, crane insurance device is not complete, not reliable and not hanging;
11, where there are high-voltage lines can not work; 12, cloudy wind and rain can not work;
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