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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Compact Modular Cabinets
555-230-128
Issue 3
May 1998
Install and Cable the Cabinets
Page 1-16AC Power and Ground
1
APPROVED FLOOR GROUNDS
!
CAUTION:
If the approved ground is inside a dedicated equipment room, then these
connections must be made by a qualified electrician.
Floor grounds are those grounds on each floor of a high-rise building that are
suitable for connection to the ground terminal in the riser closet and to the
cabinet single-point ground terminal. Approved floor grounds may include:
■ Building steel
■ The grounding conductor for the secondary side of the power transformer
feeding the floor
■ Metallic water pipes
■ Power-feed metallic conduit supplying panel boards on the floor
■ A grounding point specifically provided in the building for the purpose
Uninterruptible Power Supply
An optional UPS (Uninterruptible Power Supply) may be used for power
holdover. The type of UPS depends on the holdover requirements. Holdover
times vary from less than 10 minutes to up to 8 hours. The UPS must provide
surge protection for all connected cabinets.
1. Connect the UPS to an electrical outlet capable of handling the power
requirements of all cabinets:
a. For 100 VAC, multiply 4.5 Amps times the number of cabinets.
b. For 120 VAC, multiply 3.8 Amps times the number of cabinets.
c. For 200 VAC, multiply 2.3 Amps times the number of cabinets.
d. For 220-240 VAC, multiply 2.0 Amps times the number of cabinets.
2. Be sure that Cabinet A (control carrier) is connected to an “unswitched” or
“always on” electrical outlet on the UPS.