Cisco BWX 8305 Installation And Commissioning Manual page 63

Chapter 6 Installation
6.4.3.2 External Power Source / Supply Considerations
Note the following considerations for the - 48V and + 24V BS chassis:
6.4.3.3 BWX 8305 Ground Bus Bar Installation Procedure
Prior to connecting power and grounding to the equipment, be sure to check all regulatory requirements.
Follow accepted Telecom standards and procedures to connect input power and grounding to the BS. The
gauge of the wire is determined by the length of the run and by NEC/CEC standards (refer to Regulatory
information in the front of this document). Use a 60-amp circuit breaker when running the line.
Terminate both of the input power wires and the ground wire with a ¼-inch terminal lug.
Ensure that the power is off before connecting the input power wires to the BS input terminals.
Warning
The power supply range must meet specifications for BS components.
Warning
Install the rubber gasket into the groove in the surge protector:
6.4.3.4 Install Jumper Cables
Next, install the jumper cables from the lower bus bar to the Basestation.
6.4.3.5 System Ground Wiring
Install the system ground as a single point connection between the system ground bus bars, the BS unit,
the BS mounting rack, and the BWX 8305 Basestation Antenna. Connect the system ground to earth
ground. AWG #6 is used between the equipment and the bus bar, and AWG #2 is used from the bus bar
to the earth ground. Always refer to the regulatory standards for power and grounding. Apply
anti-oxidant joint compound to all connections
OL-16336-02
An external method of disconnecting each of the DC power Load/Return lines to the BS chassis
a.
is required, either through fuse + disconnect device(s) or a dual-pole breaker. The fuse/breaker
rating must be minimum 10% higher than that of the BS Chassis breaker but shall not exceed
70A.
The external DC power source, if current limited, shall have the limit set-point configured
b.
higher than the BS Chassis breaker rating.
The external supply "Return" and the BS chassis shall be bonded to a common Earth ground.
c.
The BS Chassis has an external ground lug provided.
d. Do not remove protective earth connection before disconnecting the Basestation from the DC
power supply.
Install the surge protector in the system ground bus bar with the surge side toward the antenna
a.
and the protected side toward the BS.
Install the star washer and nut on the top of the surge protector. Torque the nut to 140-150
b.
inch-pounds.
(Figure 6-26). Tighten all connections until secure.
BWX 2305 Basestation Installation and Commissioning Guide
BWX 8305 Basestation Installation
6-27