Guidelines For Dc-Powered Systems; Guidelines For Ac-Powered Systems; Prevent Power Loss - Cisco 8011-2X2XP4L Hardware Installation Manual

Guidelines for DC-Powered Systems

Warning
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• Each chassis power supply has its own dedicated input power source. The source must comply with the
• Protect the circuit by a dedicated two-pole circuit breaker. Ensure that the circuit breaker is sized according
• The circuit breaker is considered as the disconnect device and is easily accessible.
• The system ground is the power supply and chassis ground.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.
• Do not connect the DC return wire to the system frame or to the system-grounding equipment.
• Ensure that the DC return is grounded at the source side.
• Ensure that each power feed of the equipment is connected to different sources.

Guidelines for AC-Powered Systems

Basic guidelines for AC-powered systems include the following:
• Each chassis power supply has its own dedicated branch circuit.
• Ensure that the circuit breaker is sized according to the power supply input rating and local or national
• The AC power receptacles that are used to plug in the chassis must be the grounding type. The grounding

Prevent Power Loss

Use the following guidelines to prevent power loss to the device:
• To prevent input power loss, ensure that the maximum load on each circuit supplying the power is within
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
Determining power requirements is useful for planning the power distribution system to support the device.
Hardware Installation Guide for Cisco 8011-2X2XP4L PLE Service Endpoint Router
8
Statement 1024 Ground Conductor
This equipment must be grounded. To reduce the risk of electric shock, 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.
safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and IEC 60950
standards.
to the power supply input rating and local or national code requirements.
code requirements.
conductors that connect to the receptacles must connect to protective earth ground at the service equipment.
the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems such as the device,
which can have substantial current-draw fluctuations due to bursty data traffic patterns.
Safety Warnings