Huawei DBS3900 Installation Manual page 148

DBS3900 LampSite
Installation Guide
Figure 8-32 Installing steel hangers
Step 3 Install the nuts, spring washers, flat washers, and a U-shaped metal plate onto the steel
hangers, and use a torque wrench to torque the U-shaped metal plate to 5 N•m (on M6 steel
hangers) or 12 N•m (on M8 steel hangers). See Figure 8-33.
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Figure 8-33 Installing the U-shaped metal plate onto the steel hangers
(1) Nuts
Issue 08 (2016-05-30)
The edge side of the U-shaped metal plate must face upwards.
The nuts on the underside of the U-shaped metal plate must be completely fixed into the steel
hangers, and the lower surface of a nut cannot be exposed on the end side of steel hangers, as shown
in Figure 8-33.
(2) Spring washers
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8 Installing a pRRU3902 or pRRU3911 or
pRRU3911+WIFI
(3) Flat washers
141