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Cisco SCE8000 Installation and Configuration Guide, Rel 3.1.7
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Chapter 4 Installing the Cisco SCE8000 Chassis
Preparing for Installation
Follow these requirements when preparing your site for the Cisco SCE8 000 installation:
• The redundant power configuration provides a second, identical power supply to en sure that power
to the chassis continues uninterrupted if one power supply fails or input power on one line fails.
• Connect each of the two power supplies to a separate input power source. If you fail to do th is, your
system might be susceptible to total power failure due to a fault in the external wiring or a tripped
circuit breaker.
• To prevent a loss of input power, be sure that the total maximum load on each circuit supplying the
power supplies is within the current ratings of the wiring and breakers.
• In some systems, you might use an uninterruptible power supply (UPS) t o 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 SCE8000, which can have substantial current draw
fluctuations due to bursty data traffic patterns.
Power Connection Guidelines
This section provides the guidelines for connecting the Cisco SC E8000 AC and DC power supplies to
the site power source.
• AC-Powered Systems, page 4-4
• DC-Powered Systems, page 4-10
• Site Planning Checklist, page 4-11
AC-Powered Systems
• 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 at 20A.
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 typ e. The grounding
conductors that connect to the receptacles should conn ect to protective earth ground at the service
equipment.
Warning
Never defeat the ground conductor or operate the equipment in the absence of a suitably installed
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.
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building
installation. Install only in accordance with national and local wiring regulations.