Install and Connect MCC1 (Multicarrier) Cabinet
Connect DC Power and Ground
SI Installation and Upgrades
343
June 2004
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Connect AC Power
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1
Set the main circuit breakers on the power distribution unit OFF.
2
Connect cabinet AC line cords to the AC power receptacles.
NOTE:
Do not power up the system at this time.
Connect DC Power and Ground
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CAUTION:
Grounding of the system shall comply with the general rules for grounding contained in
Article 250 of the National Electrical Code, NFPA 70. For more information, refer to
Approved Grounds
.
The grounding methods for the DC-powered system are more complex than that of an AC-powered
system.
Figure 95, Typical Power and Ground for a DC-Powered Cabinet,
on page 344 shows a typical power and
ground layout for a DC-powered cabinet. The size of the wire required for the -48 volt DC and -48 volt
return must ensure the voltage supplied by the battery plant is maintained between -42.5 and -54.2 volts
DC at all times for proper operation and to prevent hardware damage. The wire must be sized for a
maximum voltage drop of 0.5 VDC in each leg of the DC distribution. This procedure applies to both
PPN and EPN cabinets.
Task List: Connect DC Power and Ground
Perform these tasks to connect DC power and ground, power distribution unit (J58890CH-1 Only):
1
Install Rectifier Modules and Battery Interface Unit
2
Connect Power and Ground(s)
Perform these tasks to connect DC Power and Ground (J58890CF Only):
NOTE:
These installation tasks correspond to the numbers in
Figure 95, Typical Power and
Ground for a DC-Powered Cabinet,
on page 344:
1
Install Coupled Bonding Conductor Wires
2
Connect DC Battery and Power Cabinet Grounds
3
Connect DC Power Cabinet Approved Ground
