AC Power Requirements
In addition to the requirements in the
General Power and Grounding Requirements, on page 26
, AC input
power requirements are as follows:
•
An AC-powered chassis requires up to a maximum of 12,000 watts of AC input power when the chassis
is fully loaded.
•
Two separate and independent AC power sources are required for N+N redundancy, one for each power
shelf. Each power shelf should be connected to a different power source to provide 2N power redundancy
in case a power source fails. The system will operate with power to only one shelf but will not have
N+N redundancy.
•
Each AC power source must provide single-phase AC power, and have its own circuit breaker.
•
The AC power receptacles used to plug in the chassis must be the grounding type. The grounding
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
•
AC single-phase input:
◦
Single-phase, 200 to 240 VAC nominal, 50 to 60 Hz, 17A maximum.
◦
Each AC power shelf contains four specific single phase AC inlet connectors. These connectors
can accept four AC power cords provided by Cisco. AC power cords provided by Cisco can have
a IEC-309 plug 32A rated for International power systems, or a NEMA L6-30P plug 30A rated
for North America Power Systems.
The external breaker current rating can be less than 30A, depending on the chassis configuration. Please
refer to the national installation rules for the correct rating of the breakers or fuses.
Note
NEBS Supplemental Unit Bonding and Grounding Guidelines
You must connect the central office ground system or interior equipment grounding system permanently to
one of the two supplemental bonding and grounding connections on the back or side of the chassis to meet
Network Equipment Building System (NEBS) requirements as well as safety compliance requirements. These
grounding points are referred to as the NEBS bonding and grounding points.
These bonding and grounding connections satisfy the Telcordia NEBS requirements for supplemental
bonding and grounding connections. If you are not installing the chassis in a NEBS environment, you can
choose to bypass these guidelines and rely on the safety earth ground connections to the DC power modules.
Note
Hardware Installation Guide for Cisco NCS 4000 Series
28
Installing Power Components
General Power and Grounding Requirements
