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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install and Connect Cabinets
Page 1-20Connect DC Power and Ground
1
3. DC Power Cabinet Approved Ground
1. At the DC Power Cabinet, connect a 1 AWG (#70) (44 mm
2
) ground wire to
the Ground Discharge Bar. See Figure 1-7
.
2. Route the ground wire out of the cabinet and terminate it on the approved
ground. The approved ground must be identified with a grounding tag
(FORM 15657NR or equivalent). See ‘‘
Approved Grounds’’ on page 1-23.
4. Connect Main AC Supply to DC Power Cabinet
1. Have a qualified electrician connect AC power leads to the rectifiers in the
DC Power Cabinet. Each rectifier should have its own branch circuit.
Terminate the leads on the AC INPUT terminal block of each rectifier.
2. Ensure the associated circuit breakers at the AC power panel are OFF.
5. Connect Ground Wires for DC-Powered
Systems
!
CAUTION:
Do not connect any ground wires from an EPN cabinet to another EPN
cabinet or to a PPN cabinet. All ground wires must be terminated at the
single-point ground block at the main AC supply (AC mains).
1. Connect a 6 AWG (#40) (16 mm
2
) wire to the PPN cabinet ground terminal
block.
2. Route the wire to the AC mains single-point ground block and connect.
3. Connect a 6 AWG (#40) (16 mm
2
) wire to each EPN’s cabinet ground
terminal block.
4. Route the wire(s) to the AC mains single-point ground block and connect.
6. Turn Circuit Breakers Off
The main circuit breaker on a DC-powered PPN/EPN cabinet is located on the
front of the power distribution unit. The circuit breakers on the rear of the power
distribution unit control the individual carriers. See Figure 1-4
for the location of
the carrier breakers.
1. Set the main circuit breaker to OFF.
2. Set the carrier circuit breakers to OFF.