1. The total length of the metal cable bridge and its bracket is not reliably grounded (2 locations);

2. The expansion joint is not set according to the specification requirements;

3. The cable bridge and the bracket are not fixed, and the bridge bracket is not grounded.

4. No fire blocking is done through the fire zone;

5. There is no insulation treatment against galvanic corrosion between the aluminum alloy bridge and the steel bracket;

6. The bridge elbows, tees, etc. do not use the finished accessories that are matched with the bridge, but are manufactured on site, and the processing quality does not meet the specifications;

7. When the screw hanger is installed on the bridge, the anti-shake bracket is not set according to the specifications;

8. The steel support is not constructed according to the anti-corrosion requirements;

9. The ground jumper is randomly installed or missed on both sides of the bridge, and the ground jumper is not located on the conspicuous side;

10. The crimping order of the grounding jumper wire and claw-shaped gaskets are reversed. Some claw-shaped gaskets are not provided, and the galvanized bridge grounding bolts do not have lock washers;

11. Inner pallet and slotted bridge tray cover leakage cover;

12. The nut of the fixing bolt of the bridge connecting plate is installed inside the bridge;

13. The bridge frame and the distribution box, cabinet and the steel pipe connected or connected are not grounded.