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Installing the Cisco NCS 4206
Caution
Preventing Power Loss
Use the following guidelines to prevent power loss to the chassis.
• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
Use the information in the
dissipation of a Cisco NCS 4206 based on a given configuration. Determining power requirements is useful
for planning the power distribution system.
Power Connection Guidelines
This section provides guidelines for connecting the Cisco NCS 4206 power supplies to the site power source.
Warning
Warning
Warning
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• Each chassis power supply should have its own dedicated input power source. The source must comply
• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized
• The circuit breaker is considered the disconnect device and should be easily accessible.
• The system ground is the power supply and chassis ground.
Do not use interface module and power supply ejector handles to lift the chassis; using the handles to lift the
chassis can deform or damage the handles.
supplies is within the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco
NCS 4206, which can have substantial current draw fluctuations due to bursty data traffic patterns.
DC Power Specifications
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. Statement 213
The plug-socket combination must be accessible at all times because it serves as the main disconnecting
device. Statement 1019
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. Statement 1045
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
according to the power supply input rating and local or national code requirements.
section to estimate the power requirements and heat
Installing the Cisco NCS 4206
Preventing Power Loss
23
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