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Planning for Installation
Plexus 9000 Planning and Engineering Guide
Issue 5, January 24, 2003
Section 130-200-000
6-14 Telica,
Inc.
6.1.7.3.1
Power and Alarm Panel Cabling
When the power panel is located in the same rack as the Plexus 9000 then
#6 AWG wires with double-hole lugs on the Plexus 9000 chassis end can
be used to connect the chassis to the power panel.
The Telica power and alarm panel provides a DB-9 female connector
interface to connect shelf alarms to the bay alarm indicator on the power
and alarm panel. Telica can provide DB-9 male-male cables for this
purpose as necessary.
6.1.7.3.2
Direct Home Run Power Cabling
When the Plexus 9000 is powered directly from customer-furnished power
distribution (home run), the allowable voltage drop between the Telica
shelf and the power plant is limited to 2.5V. The shelf has a maximum
load of 50-amps at -40 Vdc and requires different wire sizes depending on
the distance between the power source and the Plexus 9000. The required
wire sizes can be determined using
The distances specified
are from the power source to the Telica shelf. The Telica shelf is assumed
for these calculations to have a worst-case load of 33 amps at -40 Vdc.
Table 6.1-J. Wire Sizes For Home Run
Home run to shelf (no Power and Alarm Panel)
Wire size
Maximum distance to source
6 80
4 157
2
251
1
315
0
393
Note:
Shaded table areas represent wire sizes that cannot be directly
terminated on the lugs provided on the Telica shelf and/or breaker
panel. Crimp-type splices may be used to pigtail to the appropriate
wire size as needed.
T3-B