Dc Power Requirements - Cisco NCS 4000 Series Hardware Installation

Installing Power Components
• Installation of the routing system must follow national and local electrical codes:
• Two separate and independent DC power sources are needed to provide 2N redundancy for system
power. Each power source requires its own circuit breaker.
• Each power source must provide clean power to the site. If necessary, install a power conditioner.
• The site must provide short-circuit (over-current) protection for devices.
• Proper grounding is required at the site to ensure that equipment is not damaged by lightning and power
surges. In addition:
• Site power planning must include the power requirements for any external terminals and test equipment
you will use with your system.
Be sure to review the safety warnings in the Cisco Network Convergence System Regulatory Compliance
Note
and Safety Information for the Cisco Network Convergence System 4000 Series Routers before attempting
to install the routing system.

DC Power Requirements

Observe the following guidelines for DC-powered shelves. In addition, be sure to review the requirements
described in the
• A DC-powered chassis requires up to a maximum of 9000 watts of DC input power when the chassis is
fully loaded.
• All power connection wiring must conform to the rules and regulations in the National Electrical Code
(NEC) and any local codes. In addition, make sure that the wiring conforms to any internal requirements
at the installation site.
• Each DC power source must comply with the safety extra-low voltage (SELV) requirements in UL
60950-1, CSA-C22.2 No. 60950-1, EN60950-1, AS/NZS 60950, and IEC60950-1.
• 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.
◦ In the United States: United States National Fire Protection Association (NFPA) 70 and United
States National Electrical Code (NEC).
◦ In Canada: Canadian Electrical Code, part I, CSA C22.1.
◦ In other countries: International Electrotechnical Commission (IEC) 60364, parts 1 through 7.
◦ Chassis grounding is required for DC-powered systems.
General Power and Grounding Requirements, on page
General Power and Grounding Requirements
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Hardware Installation Guide for Cisco NCS 4000 Series
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