Power Connection Guidelines; Ac-Powered Systems; Power Requirements - Cisco 7600-SIP-400 - SPA Interface Processor 400 Installation Manual

Chapter 2 Preparing for Installation
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Use the information in
heat dissipation of a Cisco 7600 series router based on a given configuration of the router.
provides a sample calculation. Determining power requirements might be useful for planning the power
distribution system needed to support the router.

Power Connection Guidelines

This section provides the guidelines for connecting the Cisco 7600 series router AC and DC power
supplies to the site power source.

AC-Powered Systems

Basic guidelines for AC-powered systems include the following:
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Never defeat the ground conductor or operate the equipment in the absence of a suitably installed
Warning
ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are
uncertain that suitable grounding is available.
Warning The plug-socket combination must be accessible at all times because it serves as the main
disconnecting device.
OL-4503-26
In some systems, you might use an uninterruptible power supply (UPS) to protect against power
failures at your site. Avoid UPS types that use ferroresonant technology. These UPS types can
become unstable with systems like the Cisco 7600 series router, which can have substantial current
draw fluctuations due to bursty data traffic patterns.
Table 2-3
Each chassis power supply should have its own dedicated branch circuit.
The circuit must be protected by a dedicated two-pole circuit breaker. For North America, the circuit
breaker should be rated as follows:
15A for the 950 W power supply
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15A or 20A for the 1400 W power supply
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20A for the 1900 W power supply
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20A for the 2700 W power supply
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20A for the 3000 W power supply
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30A for the 4000 W power supply.
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20A for the 6000 W power supply (one for each of two inputs)
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For everywhere else, the circuit breaker should be sized according to the power supply input rating
and local or national code requirements.
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.
through Table 2-19 to estimate the power requirements and
Cisco 7600 Series Router Installation Guide
Power Connection Guidelines
Table 2-20
2-21