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Cisco Network Convergence System 4000 Series Hardware Installation Guide
Chapter 4 Installing Power Components
General Power and Grounding Requirements
•
A DC-powered system should be installed in a restricted access area in accordance with the
National Electric Code, ANSI/NFPA 70.
•
All components in the area where DC input power is accessible must be properly insulated.
If it is not possible to rely on the identification of the earthed conductor in the DC mains supply, whereby
the equipment is not provided with a two-pole disconnect device, then a two-pole disconnect device is
to be provided external to the equipment.
AC Power Requirements
In addition to the requirements in the
“General Power and Grounding Requirements” section on
, 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.
Note
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.
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
