Huawei DBS3900 Installation Manual page 247

DBS3900 (Ver.B)
Installation Guide
Figure 8-19 Stacking a cabinet onto another cabinet
Step 4 Use a torque wrench to tighten the four M12x30 bolts in the cabinet, as shown in
Figure 8-20 Tightening the bolts
(1) M12x30 bolt
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Issue 06 (2011-09-15)
8 Outdoor Scenario with DC Power Supply (BBU Installed
(2) Spring washer
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(3) Flat washer (4) Gasket with an oblong hole
in a +24 V DC APM30H)
Figure 8-20.
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