Huawei DBS3900 Installation Manual page 112

Climbing Up a Ladder
When climbing up a ladder, note the following:
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1.1.5 Mechanical Safety
Drilling Holes
Do not drill the cabinet at will. Drilling holes without complying with the requirements affects
the electromagnetic shielding performance of the cabinet and damages the cables inside the
cabinet. In addition, if the scraps caused by drilling enter the cabinet, the printed circuit
boards (PCBs) may be short circuited.
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Sharp Objects
Before you hold or carry a device, wear protective gloves to avoid getting injured by sharp
edges of the device.
Lifting Heavy Objects
Issue (02)
Ensure that the center of gravity of your body does not deviate from the edges of the two
long sides.
To minimize the risk of falling, hold your balance on the ladder before any operation.
Do not climb higher than the fourth rung of the ladder (counted from up to down).
If you want to climb up a roof, ensure that the ladder top is at least one meter higher than
the roof.
Before you drill a hole in the cabinet, wear insulated gloves and remove the internal
cables from the cabinet.
Wear an eye protector when drilling holes. This is to prevent your eyes from being
injured by the splashing metal scraps.
Ensure that the scraps caused by drilling do not enter the cabinet.
Drilling holes without complying with the requirements affects the electromagnetic
shielding performance of the cabinet.
After drilling, clean the metal scraps immediately.
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