Interconnect Drawings
Plexus 9000 Planning and Engineering Guide
Issue 3, January 24, 2003
Section 130-250-000
7-4
Telica,
Inc.
Because the allowable voltage drop between the Telica shelf and the
power plant is limited to 2.5V, the Telica shelf has a worst-case load of 33
amps; the maximum power load is 1300 Watts. The required wire sizes
for a home run are determined using
The distances specified
are from the power source to the Plexus 9000. The shaded table areas
represent wire sizes too large to directly terminate on the lugs provided on
the Plexus 9000. Crimp-type splices may be used to pigtail to the
appropriate wire size as needed.
Table 7-B. 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
7.3.2 Ground
Cabling
The Plexus 9000 is suitable for installation in either the integrated ground
plane or isolated ground plane system in a central office environment. A
single 6-AWG ground cable connects to the central office ground plane.
The Plexus 9000 power return is isolated from the chassis ground and
provides the return path for all the -48 Vdc loads in the Plexus 9000.
The frame/chassis ground path is a non-current-carrying path under
normal (no fault) conditions. It provides a low impedance connection for
all metal parts of the Plexus 9000. Each frame/chassis ground connection
within the Plexus 9000 terminates to the main ground bar.
Each Plexus 9000 chassis connects to the earth/frame ground via a
6-AWG wire, with a double-hole lug at the Plexus 9000 chassis end.