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 1-19Connect DC Power and Ground
1
Connect DC Power and Ground
The grounding methods for the DC-powered system are more complex than that
of an AC-powered system. The following installation procedures refer to Figure
1-7. The numbers 1-8 in Fig ure 1-7 matc h the following subsec tions 1-8. Other
figures may be referenced as required.
!CAUTION:

Grounding of the system s hall comply with the g eneral rules for ground ing

contained in Article 250 of the National Electrical Cod e, NFPA 70. For more

information, refer to ‘‘Approved Grounds’’ on pag e 1-23.

1. Install Coupled Bonding Conductor Wires
This is a conductor that connec ts to the single-point ground block and run
adjacent to pairs in an assoc iated cab le. The mutual cou p ling between the CBC
and the pairs reduc es p otential differences in terminating eq uipment. The
conductor c onsists of a 10 AWG (#25) (6 mm2) wire terminated at the CBC
ground terminal b ar at the Main Distribution Frame (MDF).
1. At the DC Power Cab inet, connect a 10 AWG (#25) (6 mm2) ground wire to
the Ground Discharg e Bar. See Figure 1-7.
2. Route the 10 AWG (#25) (6 mm2) gr ound wire to the CBC ground t erminal
bar at the MDF. Be sure a minimum of 12 inches (30.5 cm) spacing is
maintained between the CBC and other p ower and ground lead s.
3. Tie wrap the g round wire to the inside wiring cab le.
NOTE:
The ground wires are connec ted to the CBC as instruc ted in Chapter 2,
‘‘Install Telecommunications Cabling’’.
2. Connect DC Battery and Power Cabinet Grounds
1. Measure and cut a 6 AWG (#40) (16 mm2) wire (c omcode 846110971)
long enough to reach b etween the ground connection terminal in the DC
Battery Cabinet and the Ground Disc harge Bar in the DC Power Cabinet.
See Figure 1-7 .
2. Crimp terminal lugs on each end of the wire. Terminal lugs are furnished
as part of D-181895, Kit of Parts (comcode 10543455 9).
3. At the D C Power Cabinet, connec t the wire to the Ground Disc harge Bar.
4. Route the wire through 1 of the holes in the side of the c abinets and
terminate it on the Ground Connection Terminal in the DC Battery Cabinet.