Guidelines For Dc-Powered Systems; Guidelines For Ac-Powered Systems; Installing The Dc Power Supply - Cisco ASR 903 Hardware Installation Manual

Installing the Cisco ASR 903 Router
The plug-socket combination must be accessible at all times because it serves as the main disconnecting
Warning
device. Statement 1019
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Warning
Install only in accordance with national and local wiring regulations. Statement 1045

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
• 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 connect the DC return wire to the system frame or to the system grounding equipment.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.

Guidelines for AC-Powered Systems

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

Installing the DC Power Supply

This equipment is suitable for installation in Network Telecommunications Facilities and locations where
Note
the NEC applies.
Note This equipment is suitable for installations utilizing the Common Bonding Network (CBN).
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
sized according to the power supply input rating and local or national code requirements.
requirements.
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
Installing the DC Power Supply
103