• Carefully examine your work area for possible hazards, such as moist floors, ungrounded power extension
cables, and missing safety grounds.
• Never assume that power is disconnected from a circuit; always check.
• Never perform any action that creates a potential hazard to people or makes the equipment unsafe.
• If an electrical accident occurs and you are uninjured:
• Use caution to avoid injuring yourself.
• Turn off power to the device.
• If possible, send another person to get medical aid. Otherwise, determine the condition of the victim,
and then call for help.
• Determine whether the person needs rescue pulsing or external cardiac compressions; then take
appropriate action.
Use the following guidelines when working with any equipment that is disconnected from a power source,
but connected to telephone wiring or network cabling:
• When installing or modifying telephone lines, use caution.
• Never install telephone jacks in wet locations unless the jack is designed to handle such locations.
• Never install telephone wiring during a lightning storm.
Power Supply Considerations
Check the power at your site to ensure that you are receiving clean power (free of spikes and noise). If
necessary, install a power conditioner.
Power Connection Guidelines
This section provides guidelines for connecting the device power supplies to the site power source.
This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure that
the switch functional ground lug is connected to earth ground during normal use. Statement 1064
Warning
The plug-socket combination must be accessible at all times, because it serves as the main disconnecting
device. Statement 1019
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. Statement 1045
Warning
Cisco ASR-920-12SZ-A and Cisco ASR-920-12SZ-D Aggregation Services Router Hardware Installation Guide
6
Safety Warnings
Power Supply Considerations
