Huawei DBS3900 Installation Manual page 300

To climb up to a rooftop, the vertical height of the ladder above the rooftop must be more than
1 m, as shown in Figure 1-4.
Figure 1-4 1 m vertical height of the ladder above the rooftop
Drilling Safety
Pay attention to the following safety precautions when drilling holes on the wall or ground.
Do not drill holes on cabinets. Incorrectly drilled holes will damage cabinet electromagnetic
shielding performance and internal cables. Metal scraps generated in drilling will cause short
circuit on circuit boards in a cabinet.
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Heavy Object Transport Safety
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1.6 Maintenance Safety
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Wear goggles and protective gloves in drilling.
Cover equipment before drilling to prevent metal scraps from entering equipment interior.
Timely clear and eliminate metal scraps after drilling.
Prepare for load bearing in heavy object transport to avoid injury or sprain. When
transporting a cabinet, keep your back straight and move steadily to avoid sprain.
When transporting equipment with hands, wear protective gloves to avoid cut by edges.
When moving or lifting a shelf, hold shelf handles or bottom edge, instead of handles of
installed models in the cabinet, such as power modules, fan modules and boards.
Before replacing accessories or parts, wear an ESD wrist strap, and ensure the other end
of the ESD wrist strap is grounded and the other end is properly contacted with skin.
When replacing parts, take care of parts, bolts, and tools to prevent them from dropping
into fans can damaging fans or equipment.
When replacing shelves or parts in the cabinet, carefully pull the shelves or parts out
from the cabinet to prevent unstable or heavy devices on the cabinet from causing injury
or strain.
Safety Information