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Installation Manual – Hardware Installation
BBU3806 WCDMA Base Band Unit
Tower
ground grid
Figure 3-1 Ground grid
Ground the cabling rack, suspend iron rack, NodeB rack or frame, metal air duct,
and metal doors and windows in the equipment room.
3.4.6 General Grounding Requirements
To meet general grounding requirements, you shall:
Never connect the neutral line of AC power cable to the protection ground of any
exchange or communications devices.
Make all ground cables as short and straight as possible.
Never add fuse or switch to ground cables.
Make sure that there is no oxidation on the grounding bar against large contact
impedance between ground cables and grounding bar.
Ensure that ground cables connect to the protection grounding bar of the
equipment room securely.
3.4.7 Grounding Impedance Requirements
The grounding impedance of NodeB cannot exceed 5 ohm. For places with less than
20 thunderstorm days in a year, the grounding impedance of NodeB can be lower
than 10 ohm.
3.4.8 Lightning Rod Requirements
Make sure that all NodeB antennas stay under effective protection of the lightning rod.
The lightning rod must have a dedicated line for lightning current lead. The lightning
rod shall be made of 40 mm × 4 mm galvanized flat steel.
3.4.9 Feeder Cabling and Grounding Requirements
To meet the requirements for feeder cabling and grounding, you shall:
Horizontal
grounding body
Equipment room
ground grid
Huawei Technologies Proprietary
BBU3806 Operating Environment Requirements
Vertical
grounding body
Transformer
ground grid
3-4
Chapter 3
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