Install and Connect MCC1 (Multicarrier) Cabinet
Task List: Connect DC Power and Ground
352
SI Installation and Upgrades
June 2004
Figure 100: Typical Power and Ground for a Mixed AC/DC-Powered Cabinet
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Connect Remote Power Off Cable
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Figure 101, Remote Power Off Cable Connections — Part 1,
on page 353 shows the location of the
Remote Power Off (RPO) cable. The opposite end of the cable connects to the Emergency Power Off
(EPO) switch located outside of the equipment room.
Even though the equipment room EPO switch disconnects main AC power to the equipment room, it
cannot disconnect the battery power from the J58890CH. An auxiliary set of contacts inside the EPO are
used for this function.
1
Plug the RPO cable into the connector shown in
Figure 101, Remote Power Off Cable
Connections — Part 1,
on page 353.
2
Route the opposite end of the wires to the EPO switch. The opposite end of the RPO cable
connects to the internal relay.
NOTE:
The EPO switch and the auxiliary contacts (inside the EPO switch assembly) are
customer-provided.
CAUTION:
The auxiliary contacts inside the EPO switch assembly must
close
when the switch is
pressed. This contact closure energizes the relay inside the power distribution unit,
causing the connection to the battery holdover assembly to open.
Approved
ground
1 AWG (44 mm
2
) up to
50 feet (15.2 m) or engineered for
less than 0.5 volt drop per conductor
To AC
power source
EPN
cabinet
AC power-
distribution unit
Cabinet
ground block
-48V
-48V RTN
PPN
cabinet
75A
-48V
DC power
supply
System
single-point
ground
Coupled
bonding conductor
To CBC terminal
block at MDF
AC power cord
cydfacdc KLC 032999
Ground
discharge
bar
