CHAPTER 7
Connecting Power and Ground
This chapter explains how to connect the power and ground.
The sections are:
•
Power and Ground Description, page 75
•
NTP-L35 Installing the Power and Ground to the NCS 2002 Shelf, page 76
Power and Ground Description
Ground the equipment according to Telcordia standards or local practices. The following sections describe
power and ground for the NCS 2002 shelves.
For detailed instructions on grounding the NCS 2002 chassis, see the Electrostatic Discharge and Grounding
Guide for Cisco NCS 2000 Series.
ANSI Power and Ground
For AC power feed, use the power cable shipped with the NCS 2002 and one ground cable. For an AC power
supply, the fuse rating must not exceed 10A, 15A, or 20A. For North America, the branch circuit protection
must be rated 20A. The overcurrent/short circuit protection must be in accordance with local and national
electrical codes. The voltage rating value for AC power ranges between 100 VAC to 240 VAC depending on
the standards in various countries. This product is intended for use on the TN and TT power systems.
The NCS 2002 has redundant –48 VDC #12 single-hole lug power terminals. The terminals are labeled
RET(A), RET(B), -48V(A), and -48V(B) on the power module.
To install redundant DC power feeds, use four power cables and one ground cable. For a single power feed,
only two power cables (#12 AWG or larger, copper conductor, 194 degrees F [90 degrees C] minimum) and
one ground cable (#6 AWG or larger) 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 15A. The voltages –40.5 VDC
and –57.6 VDC are, respectively, the minimum and maximum voltages required to power the chassis. The
nominal steady state voltage is -48 VDC.
Cisco NCS 2000 Series Hardware Installation Guide
75
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