Card Slot Fuses - Cisco BPX 8620 Installation And Configuration Manual

Chapter 10 Installing the DC Shelf
Remember that this is a positive ground system. Connect the positive lead to the +RTN terminal.
Warning
Connect the negative lead to the –48V terminal. Connect the earth ground to the middle terminal
labeled SAFETY GROUND (see Figure 10-1, Figure 10-2, and Figure 10-3). For personnel safety, the
green/yellow wire must be connected to safety (earth) ground at both the equipment and at the
supply side of the DC wiring.
Terminate the DC input wiring to a DC source capable of supplying at least 50 amperes. A 50A DC
Step 6
circuit breaker is required at the 48 VDC facility power source. An easily accessible disconnect device
should be incorporated into the facility wiring. Be sure to connect the ground wire or conduit to a solid
office (earth) ground.
Note
Step 7 If the system is equipped with dual power feed, repeat steps 1 through 6 for the second power feed.
Either replace the cover on the conduit terminating box(es) or attach the plastic cover plate(s) to the
Step 8
terminal block with screws into the two terminal block standoffs (see Figure 10-2 and Figure 10-3).
Proceed to Chapter 13, "Installing the BPX Switch Cards."
Step 9

Card Slot Fuses

Fuses for each card slot are installed to the backplane of the BPX switch to protect against catastrophic
backplane damage in the event of a shorted connector power pin. Backplane fuses should rarely, if ever,
need replacement. The card slot fuses are designated F4 through F18, corresponding to card slot numbers
1 through 15, respectively.
For instructions on replacement of these fuses, see Chapter 29, "Replacing Parts." Contact Cisco
Customer Service for assistance regarding their replacement.
Caution For continued protection against risk of fire, replace only with the same type and rating of fuse. Fuses
should be replaced only after all power to the BPX switch has been turned off.
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Primary overcurrent protection is provided by the building circuit breaker. In North America,
this breaker should protect against excess currents, short circuits, and earth faults in
accordance with NEC ANSI NFPA 70/CEC.
Cisco BPX 8600 Series Installation and Configuration
Card Slot Fuses
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