Guidelines For Dc-Powered Systems; Guidelines For Ac-Powered Systems; Preventing Power Loss - Cisco ASR-920-24SZ-IM Hardware Installation Manual

Installing the Router
This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure
Warning
that the switch functional ground lug is connected to earth ground during normal use. Statement 1064
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
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be
sized according to the power supply input rating and local or national code requirements.
• 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.
• Ensure the DC return is grounded at the source side.

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
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.

Preventing Power Loss

Use the following guidelines to prevent power loss to the router:
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation
Power Connection Guidelines
Guide
101