Cisco NCS 2006 Hardware Installation Manual page 356

Power and Ground
For redundant AC power feeds, install the four AC power modules, and use the four power cables (right and
left cables) and one ground cable.
The ground lug of the NCS 2015 AC shelf must be permanently connected to ground. The single ground
Note
lug must be a dual-hole type, UL Listed, CSA certified and rated to accept the #4 AWG cable. The
grounding lug must be assembled on the chassis with two screws and washers.
For the NCS 2015 AC shelf:
• The building installation must provide a means for connection to protective earthing.
• The equipment must be soundly earthed.
• Service personnel must check whether the socket outlet from which the equipment is to be powered
provides a connection to the building's protective earthing. If there is no connection, the service personnel
must arrange for the installation of a protective earthing conductor from a separate earthing terminal to
the protective earthing wire in the building.
For an AC power supply, the fuse rating must not exceed 20A. For North America, the branch circuit protection
must be rated 20A. The overcurrent or short circuit protection must be in accordance with local and national
electrical codes. The voltage rating value for AC power ranges between 200 VAC to 240 VAC depending on
the standards of various countries. This product is intended for use on the TN and TT power systems.
For redundant DC power feeds, install four DC power modules and use eight power cables and one ground
cable. For a single power feed, only two power cables (#6 AWG, copper conductor, 194 degrees F [90 degrees
C] minimum) and one ground cable (#4 AWG) are required. Use a conductor with low impedance to ensure
circuit overcurrent protection. However, the conductor must have the capability to safely conduct any faulty
current that might be imposed. For a DC power supply, the fuse rating must not exceed 60 A.
The DC power modules have –48 VDC or –60 VDC #6 AWG dual-hole lug power terminals.
We recommend the following wiring conventions, but customer conventions prevail:
• Red wire for battery connections (–48 VDC or –60 VDC).
• Black wire for battery return connections (RET).
• The battery return connection is treated as DC-I, as defined in Telcordia GR-1089-CORE, Issue 6.
Cisco NCS 2000 Series Hardware Installation Guide
328
Connecting Power and Ground