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Chapter 2
Preparing for Installation
Before starting work on the system, turn off the DC main circuit breaker and disconnect the power
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terminal block cable.
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Before doing the following, disconnect all power:
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Never install equipment that appears damaged.
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Carefully examine your work area for possible hazards, such as moist floors, ungrounded power
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extension cables, and missing safety grounds.
Never assume that power is disconnected from a circuit; always check.
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Never perform any action that creates a potential hazard to people or makes the equipment unsafe.
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If an electrical accident occurs, proceed as follows:
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In addition, use the following guidelines when working with any equipment that is disconnected from a
power source, but still connected to telephone wiring or network cabling:
Never install telephone wiring during a lightning storm.
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Never install telephone jacks in wet locations unless the jack is specifically designed for it.
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Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected at
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the network interface.
When installing or modifying telephone lines, use caution.
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OL-32751-01
Working on or near power supplies
Installing or removing a router chassis or network processor module
Performing most hardware upgrades
Use caution, and do not become a victim yourself.
Turn off power to the router.
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 breathing or external cardiac compressions; then
take appropriate action.
Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide
Safety Guidelines
2-7