Plexus 9000 Planning and Engineering Guide
Interconnect Drawings
Section 130-250-000
Issue 3, January 24, 2003
Telica, Inc.
7-3
7.3.1 Power
Cabling
Each Plexus 9000 requires that redundant power be provided from two
separate (A and B) 50 amp breakers at -48 Vdc. Therefore, each breaker
requires wiring sized to handle up to 50 amps at -48 Vdc. Each power
connection requires two wires, -48 Vdc and Return.
Power can be provided to the Telica shelf either directly from customer
power distribution (home run) or via a Power and Alarm Panel (PAP)
mounted in the equipment bay. A PAP can be purchased from Telica.
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
connect the chassis to the breaker panel.
The input power wire sizing at the power panel must support a 150-amp
bus rating and thus must have a minimum size of 1-AWG. The primary
system breaker must have a minimum rating of 100 amps.
The allowable voltage drop between the Telica shelf and the power plant
is limited to 2.5V.
specifies the maximum allowable distances from the power
source to the PAP for the allowable wire sizes. The shaded table areas
represent wire sizes too large to directly terminate on the lugs provided on
the Telica power and alarm panel. Crimp-type splices may be used to
pigtail to the appropriate wire size as needed.
Table 7-A. Wire Sizes To Power And Alarm Panel
Power and Alarm Panel Feed
Wire size
Maximum distance to source
1 102
0 127
00
159
000
198
0000
250
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.
T2-B