Example Of Metal Mast Installation On Building-Top - Huawei iSiteC BTS3601C Installation Manual

Installation Manual
iSiteC BTS3601C CDMA Base Station
angle 30°C between them), as shown in Figure 2-5. The 40mm%4mm
hot-gavanlizing flat steel should be used as the downleads of arresters.
The external shielding layer of the BTS3601C antenna and feeder should be
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grounded at the bottom of the antenna and at the front end beofore they are
connected to the BTS3601C. The grounding cable should be connected to the
cabling ladder or other metal grounding parts. The grounding cable should be
made of yellow-green (or black) plastic insulation copper wire with the core
diameter not less than 6mm
Grounding bar can be installed on the metal holding support, or fixing beam, or
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platform directly and reliable electric connection should be achieved among the
grounding bar and the metal parts aforementioned. A dedicated grounding
downlead should be installed on the grounding bar and be connected to the
counterpoise.
Power cables and trunk cables should not be winded or bound on the arresters or
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their downleads, instead, these cables should be kept as far as possible from the
downleads of arresters. Power cables and signal cables should be distributed
horizontally and the spacing between any two cables should be at least 5cm. And
they should not be routed vertically and crossly.

2.2.4 Example of Metal Mast Installation on Building-top

Such installation of BTS3601C is applied for the coverage of villages and towns.
I. Facility requirements
For an omni BTS, 3 masts should be used (one is used to install the lightning
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arrester and the other two to install two monopole omni antennae. The spacing
between the latter two masts should be over 4.5m. Two masts are generally used
for a directional BTS, as dual polarization antenna is adopted for the BTS.
The length of the mast should be determined by the height of the BTS3601C
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antenna. However, based on the conditions on building-top, the mast length
should not be more than 8m.
The mast should be made of steel pipe with sufficient intensity and the dialmeter
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from 60mm to 114mm. Each mast must be secured by three steep ropes at least.
A cabling rack should be installed between the masts on which the antenna is
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fixed. Its height should be lower than 1.2m.
The PGND bar should be fixed to the AC lightning protection box or at the bottom
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of the IAFB mast and close to the building wall. Following are three methods to
connect the PGND cables:
a) If the equipment room is located in the building, lead the grounding cable from
the building-top to the grounding bar in the equipment room;
b) Connect the grounding cable to the counterpoise at the building bottom;
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Hardware Installation
2 Installing Cabinet Hardware